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CVE-2026-70628

HIGH 8.5 ALL-YEARS

Published 2026-08-06 · Last modified 2026-08-14 · VulnCheck · NVD: Analyzed

FFmpeg versions from 0.5 up to, but not including, 9.0 contain a signed integer overflow vulnerability in the DVB subtitle parser in libavcodec/dvbsub_parser.c that allows attackers to trigger a heap buffer overflow by supplying a crafted WTV file. The overflow causes the bounds-check guard expression to wrap to INT_MIN, bypassing the PARSE_BUF_SIZE comparison and invoking memcpy() with attacker-controlled data into a heap buffer, resulting in an out-of-bounds heap write and potential memory corruption or code execution.

ELEVATED IMPACT

Severe if exploited (CVSS 8.5), but no confirmed exploitation. Patch on a normal cadence.

Exploitation likelihood

0.1%chance of exploitation in 30 days · 4th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable no

Impact if exploited

8.5CVSS 4.0 · HIGH · CNA

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ✓Privileges: No account or privileges required
  • ⚠User interaction: Succeeds with passive user activity
  • ✓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

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

Affected

Vendors Ffmpeg

Products Ffmpeg

Weakness (CWE)

  • CWE-190: Integer Overflow or Wraparound
  • CWE-787: Out-of-bounds Write

CVSS vector

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

References and research data (JSON)

Vendor product assessments

  • ffmpeg.src as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/ffmpeg?arch=src

    • workaround: To mitigate this issue, avoid processing untrusted WTV (Windows Recorded TV Show) files, especially those containing DVB subtitles. Exercise caution when handling multimedia files from unknown or suspicious sources.
    • none available: Affected
    Red Hat · CVE-2026-70628 · Updated 2026-08-19T16:59:58+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?repository_url=registry.redhat.io/rhelai3/bootc-aws-cuda-rhel9

    • workaround: To mitigate this issue, avoid processing untrusted WTV (Windows Recorded TV Show) files, especially those containing DVB subtitles. Exercise caution when handling multimedia files from unknown or suspicious sources.
    • none available: Affected
    Red Hat · CVE-2026-70628 · Updated 2026-08-19T16:59:58+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?repository_url=registry.redhat.io/rhelai3/bootc-azure-cuda-rhel9

    • workaround: To mitigate this issue, avoid processing untrusted WTV (Windows Recorded TV Show) files, especially those containing DVB subtitles. Exercise caution when handling multimedia files from unknown or suspicious sources.
    • none available: Affected
    Red Hat · CVE-2026-70628 · Updated 2026-08-19T16:59:58+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?repository_url=registry.redhat.io/rhelai3/bootc-azure-rocm-rhel9

    • workaround: To mitigate this issue, avoid processing untrusted WTV (Windows Recorded TV Show) files, especially those containing DVB subtitles. Exercise caution when handling multimedia files from unknown or suspicious sources.
    • none available: Affected
    Red Hat · CVE-2026-70628 · Updated 2026-08-19T16:59:58+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?repository_url=registry.redhat.io/rhelai3/bootc-cuda-rhel9

    • workaround: To mitigate this issue, avoid processing untrusted WTV (Windows Recorded TV Show) files, especially those containing DVB subtitles. Exercise caution when handling multimedia files from unknown or suspicious sources.
    • none available: Affected
    Red Hat · CVE-2026-70628 · Updated 2026-08-19T16:59:58+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?repository_url=registry.redhat.io/rhelai3/bootc-gcp-cuda-rhel9

    • workaround: To mitigate this issue, avoid processing untrusted WTV (Windows Recorded TV Show) files, especially those containing DVB subtitles. Exercise caution when handling multimedia files from unknown or suspicious sources.
    • none available: Affected
    Red Hat · CVE-2026-70628 · Updated 2026-08-19T16:59:58+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?repository_url=registry.redhat.io/rhelai3/bootc-rocm-rhel9

    • workaround: To mitigate this issue, avoid processing untrusted WTV (Windows Recorded TV Show) files, especially those containing DVB subtitles. Exercise caution when handling multimedia files from unknown or suspicious sources.
    • none available: Affected
    Red Hat · CVE-2026-70628 · Updated 2026-08-19T16:59:58+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?repository_url=registry.redhat.io/rhoai/odh-vllm-gaudi-rhel9

    • workaround: To mitigate this issue, avoid processing untrusted WTV (Windows Recorded TV Show) files, especially those containing DVB subtitles. Exercise caution when handling multimedia files from unknown or suspicious sources.
    • none available: Affected
    Red Hat · CVE-2026-70628 · Updated 2026-08-19T16:59:58+00:00

Known Affected Software Configurations

VendorProductVersion range
FfmpegFfmpeg≥ 0.5 and < 9

All CVSS metrics

  • HIGH 8.5 v4.0 · CNA Primary
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  • HIGH 7.8 v3.1 · CNA Primary
    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  • HIGH 8.5 v4.0 · NVD Secondary
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/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
  • HIGH 7.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS