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CVE-2026-107832

LOW 3.7

Published 2026-10-13 · Last modified 2026-10-15

fastify is a fast and low overhead web framework for Node.js. In versions 5.12.2 through 5.12.5, the routine that lowercases header names declared in a route schema does not lowercase the enum or const header names nested inside a propertyNames subschema. As a result, a header allow-list or deny-list written with canonical (non-lowercase) casing never matches the incoming lowercased header, so a restricted header passes validation and reaches the route handler. An attacker can therefore bypass a case-sensitive header validation rule and smuggle a forbidden header past the schema, affecting the integrity of request handling. The issue is fixed in fastify 5.12.6, and users should upgrade to 5.12.6 or later. There is no workaround other than upgrading, though applications can declare header names in lowercase to avoid the mismatch.

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 · 17th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

3.7CVSS 3.1 · LOW

  • ConfidentialityNone
  • IntegrityLow
  • AvailabilityNone

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: Needs a race window or specific setup

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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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 Fastify

Products Fastify

Weakness (CWE)

  • CWE-178: : Improper Handling of Case Sensitivity

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • fastify npm

    pkg:npm/fastify

    SEMVER range
    • Introduced version (included): 5.12.2
    • Fixed boundary (excluded): 5.12.6
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-389g-gv7q-r4x8/GHSA-389g-gv7q-r4x8.json"
  }
}
    GitHub Advisory Database · GHSA-389g-gv7q-r4x8 · Updated 2026-10-22T16:45:04.287484964Z

Vendor product assessments

  • 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:e0fbb896811ab54d183e23612030072b946674824bad697bf2b3f68362651662?repository_url=registry.redhat.io/rhelai3/bootc-cuda-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+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: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+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@sha256:8fe5203e86917e5f829bd64b831cad31536d23a213b4bfe31e652577ad0faf2e?repository_url=registry.redhat.io/rhelai3/bootc-rocm-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhelai3/disk-image-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/disk-image-cuda-rhel9@sha256:9d807c5381e81734b6303669421b265aea1eca54a18ca577d453508ffde1770c?repository_url=registry.redhat.io/rhelai3/disk-image-cuda-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-core-bff-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-core-bff-rhel9@sha256:e683d11de1a782b2a796c99eccb5dfb3b908e721210ba87c2e06768f1fa8745d?repository_url=registry.redhat.io/rhoai/odh-core-bff-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-dashboard-operator-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-dashboard-operator-rhel9@sha256:0f0a7c4386c958d30b1be5dcbec6a98ae5cabbdfb93570849991912cf318ae99?repository_url=registry.redhat.io/rhoai/odh-dashboard-operator-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-dashboard-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-dashboard-rhel9@sha256:3598eb7647c5b3489db1eeb00db8e842a0b7208205718e817689fedf0fe194f2?repository_url=registry.redhat.io/rhoai/odh-dashboard-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-mod-arch-agent-ops-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-agent-ops-rhel9@sha256:bf5e5b308f9f167fe21c2ac0f8f7dd65af47bbd7d0c3396b66fbe62620d853b4?repository_url=registry.redhat.io/rhoai/odh-mod-arch-agent-ops-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-mod-arch-automl-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-automl-rhel9@sha256:5cfd714e9a5fa61ed867771fbbb2b22e5a79ad05fd6940fa80dab09dfa43aef6?repository_url=registry.redhat.io/rhoai/odh-mod-arch-automl-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-mod-arch-autorag-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-autorag-rhel9@sha256:ae98ca5f53502bd9f40f74ad9f834676200cf65773f139829d13a69aed8a0de9?repository_url=registry.redhat.io/rhoai/odh-mod-arch-autorag-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-mod-arch-eval-hub-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-eval-hub-rhel9@sha256:147f35cb1319e707ca9c3d68be2c6eb026bde915b8ffee9e22b003403b8e2896?repository_url=registry.redhat.io/rhoai/odh-mod-arch-eval-hub-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-mod-arch-gen-ai-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-gen-ai-rhel9@sha256:aa5a8ab4112bf9d6a356740103d97497f7b76071ab979eeb3d6a86322f928e31?repository_url=registry.redhat.io/rhoai/odh-mod-arch-gen-ai-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-mod-arch-maas-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-maas-rhel9@sha256:f46aa6658c532ac9e8fcb3feeb5d764d9ee0eaf9e8af0563e87ef3998b5e426e?repository_url=registry.redhat.io/rhoai/odh-mod-arch-maas-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-mod-arch-mlflow-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-mlflow-rhel9@sha256:59d595add75040b8408c9536c0b7fb422f437b5ae359c0324b54cb1e1718c995?repository_url=registry.redhat.io/rhoai/odh-mod-arch-mlflow-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • rhoai/odh-mod-arch-model-registry-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-model-registry-rhel9@sha256:7051b4bc1631d4be790d6ad2b1c8cb579090dfaeb39e17ba91037b6cb456a8c7?repository_url=registry.redhat.io/rhoai/odh-mod-arch-model-registry-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00
  • devspaces/dashboard-rhel9 as a component of Red Hat OpenShift Dev Spaces · known affected

    Vendor assessment for this product only.

    pkg:oci/dashboard-rhel9@sha256:4da408d8b9dd1368285e5f289dd89ab2f86f069e50d88b1241e997b88edbf7ed?repository_url=registry.redhat.io/devspaces/dashboard-rhel9

    • workaround: Applications can work around this issue by declaring header names in lowercase in the enum or const values of the route schema's propertyNames subschema, so the declared names match the lowercased incoming headers and the allow-list or deny-list validation applies as intended. The upstream fix is available in fastify 5.12.6 and later; for the affected Red Hat products the fix is currently deferred.
    • none available: Fix deferred
    Red Hat · CVE-2026-107832 · Updated 2026-10-16T09:49:53+00:00

All CVSS metrics

  • LOW 3.7 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
  • LOW 3.7 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS