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CVE-2026-100647

MEDIUM 6.9

Published 2026-09-26 · Last modified 2026-09-28

vLLM versions before 0.29.0 contain a denial-of-service vulnerability in the cache_salt parameter accepted on OpenAI-compatible and Anthropic API endpoints, which lacks maximum length validation and is processed on the single EngineCore scheduler thread. Unauthenticated attackers can send HTTP requests with multi-hundred-megabyte salt values that trigger expensive pickle serialization and SHA-256 hashing, stalling the scheduler thread and denying service to all concurrent requests.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 28th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

6.9CVSS 4.0 · MEDIUM

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityLow

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable
  • ✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Vllm Project Vllm

Products Vllm

Weakness (CWE)

  • CWE-20: Improper Input Validation

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References and research data (JSON)

Vendor product assessments

  • rhaii/vllm-cpu-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-cpu-rhel9@sha256:81c5994dc20321f8bd3969099eade78ef127cbd79f2d0ccea101c773e4c7fa4d?repository_url=registry.redhat.io/rhaii/vllm-cpu-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaii/vllm-cuda-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-cuda-rhel9@sha256:0d22e2301ce26ef68effda5d3a4a20381ad0ea34d1240e159e245bd44c2e125b?repository_url=registry.redhat.io/rhaii/vllm-cuda-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaii/vllm-gaudi-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-gaudi-rhel9@sha256:ce1e4fd82dd37d299ce8c64a237971d00faf602f06868c986e81aefa04c283ef?repository_url=registry.redhat.io/rhaii/vllm-gaudi-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaii/vllm-neuron-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-neuron-rhel9@sha256:1079c9afecdbc33f4790792f0d712dbf7523790a92dcfbe8fb5cf4c2d282fc5b?repository_url=registry.redhat.io/rhaii/vllm-neuron-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaii/vllm-rocm-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-rocm-rhel9@sha256:1a30359d6ca5d0891e403b9b0a23c0ae1ad6e30a2429b9b42e246b874fe8859a?repository_url=registry.redhat.io/rhaii/vllm-rocm-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaii/vllm-spyre-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-spyre-rhel9@sha256:11ad6e13c41728944d933c7abe01d1d10ecb3f8e8b4f0da50ec53b7df6f036a8?repository_url=registry.redhat.io/rhaii/vllm-spyre-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaii/vllm-tpu-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-tpu-rhel9@sha256:0c2ac747d67dc0e80162ff05867dd702e474b2217659f19f28b8e3a0c03a942a?repository_url=registry.redhat.io/rhaii/vllm-tpu-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaiis/vllm-cpu-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-cpu-rhel9@sha256:fb7791bbfea99e9f81529fe8cc1e7c834ca470585c27590e3d0a6834167cd436?repository_url=registry.redhat.io/rhaiis/vllm-cpu-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaiis/vllm-cuda-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-cuda-rhel9@sha256:73bbc4560132c4aaa9bbd608ce9560eeae7b30bcc8f014da460afa5622139372?repository_url=registry.redhat.io/rhaiis/vllm-cuda-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaiis/vllm-neuron-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-neuron-rhel9@sha256:8ba72cec5d79b1a751eb09774c81fd6181b43ec69a2e5116982661b34366874d?repository_url=registry.redhat.io/rhaiis/vllm-neuron-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaiis/vllm-rocm-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-rocm-rhel9@sha256:37b64a8df90756aae0ee96d2f07765adbce5ed5beb2414ac3845806ad2219cfc?repository_url=registry.redhat.io/rhaiis/vllm-rocm-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaiis/vllm-spyre-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-spyre-rhel9@sha256:3dd7eff1c62cd4609b4c76590b77bb801cd064e40642ed32b5aa900a6bc643ea?repository_url=registry.redhat.io/rhaiis/vllm-spyre-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhaiis/vllm-tpu-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-tpu-rhel9@sha256:b1c12112a1e8a298645e10d34d44c9961a6121aa8d87fc5d65ad83e1ffa3c586?repository_url=registry.redhat.io/rhaiis/vllm-tpu-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhelai3/bootc-aws-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-aws-cuda-rhel9@sha256:a754d4d1126e98f203249414b3831182bb15ee6b3643452f167849defc642e4b?repository_url=registry.redhat.io/rhelai3/bootc-aws-cuda-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhelai3/bootc-azure-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-azure-cuda-rhel9@sha256:df5b6edd1bdb055219a7385b6d5923f3262c3a408f92da734e3027af55fd593f?repository_url=registry.redhat.io/rhelai3/bootc-azure-cuda-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhelai3/bootc-azure-rocm-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-azure-rocm-rhel9@sha256:8ea1233b1fb6b82d0aa69e9e4c47d2df242001280c11a61584066c27c5bec3a5?repository_url=registry.redhat.io/rhelai3/bootc-azure-rocm-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhelai3/bootc-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-cuda-rhel9@sha256:b45f3bc25a7d3c9f3bfdc1de3be6db59f6c3109f62326d74fae14e832a797981?repository_url=registry.redhat.io/rhelai3/bootc-cuda-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhelai3/bootc-gaudi-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-gaudi-rhel9@sha256:e1057b59ca1be9501332abf97230855e85c7df858356be0da9dce230ea7e98e1?repository_url=registry.redhat.io/rhelai3/bootc-gaudi-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhelai3/bootc-gcp-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-gcp-cuda-rhel9@sha256:bac5d435d156c3ddcb581d3ff05fdce9f72bd617c5b8435cede16bb17b7bf12e?repository_url=registry.redhat.io/rhelai3/bootc-gcp-cuda-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhelai3/bootc-rocm-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-rocm-rhel9@sha256:38ce057f97034bbb8eaea574d41cc7eebaeaa9265a4cdd966476dd3fac129c3c?repository_url=registry.redhat.io/rhelai3/bootc-rocm-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhoai/odh-kserve-agent-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-kserve-agent-rhel9@sha256:eddf436baf8906d08f1cd28fecdc73f70f9bbf11a73e327d9c97495ee921c523?repository_url=registry.redhat.io/rhoai/odh-kserve-agent-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhoai/odh-kserve-controller-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-kserve-controller-rhel9@sha256:8b4d4c6a45b2ff1b25fda45dc022066ed5d055267ce08ab0b31e58191970632e?repository_url=registry.redhat.io/rhoai/odh-kserve-controller-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhoai/odh-kserve-router-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-kserve-router-rhel9@sha256:1fb5c0b39c43904a5843a9e01cddac40cfe5580d9bb7abdf6083c9f53d1655b3?repository_url=registry.redhat.io/rhoai/odh-kserve-router-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhoai/odh-kserve-storage-initializer-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-kserve-storage-initializer-rhel9@sha256:7c88948bcfa0fc3439b1eae31c426639346044505aff440238bfb194fd15ce99?repository_url=registry.redhat.io/rhoai/odh-kserve-storage-initializer-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhoai/odh-llm-d-kv-cache-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-llm-d-kv-cache-rhel9@sha256:cb5eedeefd2578cd9bd8637250bbe299c84539f57b4ead75d630ed9f833a6ef2?repository_url=registry.redhat.io/rhoai/odh-llm-d-kv-cache-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhoai/odh-th-torch-cuda-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-th-torch-cuda-py312-rhel9@sha256:efd7b3607b699092c68359d20ef0d0043114191a097637667c0d2cf78fbea702?repository_url=registry.redhat.io/rhoai/odh-th-torch-cuda-py312-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00
  • rhoai/odh-vllm-gaudi-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-vllm-gaudi-rhel9@sha256:87eec3862eb6ddef445f89dcf6fd89add7ef202ea7c563b1ee7347537fb3e250?repository_url=registry.redhat.io/rhoai/odh-vllm-gaudi-rhel9

    • workaround: There is no vLLM env-var toggle that bounds cache_salt on vulnerable builds. Try to strip or deny cache_salt at the gateway or put Auth + rate limits on OpenAI/Anthropic-compatible endpoints.
    • none available: Fix deferred
    Red Hat · CVE-2026-100647 · Updated 2026-10-06T23:28:05+00:00

Known Affected Software Configurations

VendorProductVersion range
VllmVllm< 0.29.0

All CVSS metrics

  • MEDIUM 6.9 v4.0 · CNA Primary
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  • MEDIUM 5.3 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  • MEDIUM 6.9 v4.0 · NVD Secondary
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • MEDIUM 5.3 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  • HIGH 7.5 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS