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PatchSiren cyber security CVE debrief

CVE-2026-38347 FFmpeg CVE debrief

A heap overflow in the ff_sws_alphablendaway function of FFmpeg allows attackers to cause a Denial of Service (DoS) via a crafted input. The CVE record was published on 2026-08-28T00:17:27.420Z and has not been modified since then. This vulnerability affects users of FFmpeg, particularly those processing untrusted input. Affected systems should be reviewed for compensating controls and monitoring while remediation is scheduled and verified. Inventory checks for affected systems are recommended to ensure exposure is properly managed and mitigated. The vulnerability has a HIGH CVSS score of 7.5, indicating high severity. Defensive verification tasks and inventory checks are recommended given limited source detail.

Vendor
FFmpeg
Product
FFmpeg
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-28
Original CVE updated
2026-08-31
Advisory published
2026-08-28
Advisory updated
2026-08-31

Who should care

Users of FFmpeg, particularly those who process untrusted input, should be aware of this vulnerability and take defensive actions. This includes operators managing FFmpeg deployments, platform administrators, and security teams responsible for vulnerability management. Affected systems should be reviewed for compensating controls and monitoring while remediation is scheduled and verified. Inventory checks for affected systems are also recommended to ensure that exposure is properly managed and mitigated.

Technical summary

A heap overflow in the ff_sws_alphablendaway function (libswscale/alphablend.c) of FFmpeg allows attackers to cause a Denial of Service (DoS) via a crafted input. This vulnerability has a HIGH CVSS score of 7.5, indicating a high severity level. Users of FFmpeg, particularly those who process untrusted input, should be aware of this vulnerability and take defensive actions. The affected product context suggests that operators, platforms, and security teams may be impacted.

Defensive priority

High-priority defensive actions are recommended due to the HIGH CVSS score of 7.5.

Recommended defensive actions

  • Apply vendor remediation when available
  • Perform compensating controls and monitoring
  • Conduct inventory checks for affected systems

Evidence notes

Evidence is limited; primary official records indicate a heap overflow in FFmpeg's ff_sws_alphablendaway function. Defensive verification tasks and inventory checks are recommended. Given the limited source detail, defenders should verify affected product deployments, review official advisories, and plan for vendor-supported updates or mitigations. The CVE record was published on 2026-08-28T00:17:27.420Z and has not been modified since then. Additional review of compensating controls and monitoring is advised for exposed systems.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-38347 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-38347

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-38347 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-38347

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.