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CVE-2026-70630 FFmpeg CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-06T22:18:27.273Z and has not been modified since then. The NVD entry is currently Awaiting Analysis. The vulnerability affects FFmpeg versions from 3.0 up to, but not including, 9.0. The screenpresso_decode_frame() function in FFmpeg's native Screenpresso decoder fails to validate the produced byte count before copying the complete frame dimensions, potentially exposing sensitive data. Organizations using FFmpeg versions from 3.0 up to, but not including, 9.0 for video decoding or processing should prioritize patching to prevent potential sensitive data exposure. This includes operators of media processing services, platform providers, and security teams responsible for vulnerability management and ensuring the security of their systems and data.

Vendor
FFmpeg
Product
Unknown
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-06
Original CVE updated
2026-08-31
Advisory published
2026-08-06
Advisory updated
2026-08-31

Who should care

Organizations using FFmpeg versions from 3.0 up to, but not including, 9.0 for video decoding or processing should prioritize patching to prevent potential sensitive data exposure. This includes operators of media processing services, platform providers, and security teams responsible for vulnerability management and ensuring the security of their systems and data.

Technical summary

The screenpresso_decode_frame() function in FFmpeg's native Screenpresso decoder fails to validate the produced byte count before copying the complete frame dimensions, potentially exposing sensitive data. This occurs when the function calls av_image_copy_plane() to copy the complete frame dimensions from the persistent ctx->inflated_buf buffer, causing unwritten heap memory from prior allocations or prior frames to be copied into decoded output.

Defensive priority

Organizations using FFmpeg versions from 3.0 up to, but not including, 9.0 should prioritize patching to prevent potential sensitive data exposure.

Recommended defensive actions

  • Inventory FFmpeg installations to identify versions from 3.0 up to, but not including, 9.0.
  • Apply patches or updates to FFmpeg to version 9.0 or later.
  • Implement compensating controls, such as memory protection mechanisms.
  • Monitor for suspicious activity related to FFmpeg usage.
  • Perform regular vulnerability scans and retest systems after patching.

Evidence notes

The CVE-2026-70630 vulnerability in FFmpeg's native Screenpresso decoder allows attackers to recover sensitive memory contents. Evidence is based on official CVE and NVD records, as well as references from [email protected]. The vulnerability affects FFmpeg versions from 3.0 up to, but not including, 9.0. To verify, defenders should review the official advisory and assess their exposure.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-70630 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-70630

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

  • CVE-2026-70630 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-70630

    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.