Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-52296

CVE-2026-52296HIGH

FFmpeg before 9.0 has an out-of-bounds read because of missing required padding in WMA extradata allocation paths in libavcodec/wmaenc.c.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  H  N  H    7.1   .0016    4.5     —

AFFECTED
  Product  Versions     Fixed
  FFmpeg   unspecified  —

TIMELINE
  Jun 8   Reserved by mitre
  Sep 13  Published (CNA: mitre)
  Oct 14  RESCORED — CVE-2026-52296 (FFmpeg). CVSS 2.9 → 7.1 (NVD).

CWE-125 · CNA: mitre · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

FFmpeg before 9.0 has an out-of-bounds read because of missing required padding in WMA extradata allocation paths in libavcodec/wmaenc.c.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 8, 2026	Reserved	Reserved by mitre
September 13, 2026	Published	Published (CNA: mitre)
October 14, 2026	RESCORED	RESCORED — CVE-2026-52296 (FFmpeg). CVSS 2.9 → 7.1 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FFmpeg	FFmpeg	—	—	—

Weaknesses

CWE-125

References (3)

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22988 [Issue Tracking, Patch]
https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/23227a444de4a8f7696f46660cdd044b460f7e47 [Patch]
https://github.com/Kenan-Kamel/VulnerabilitiesReference/tree/main/FFmpeg/ExtradataPadding [Third Party Advisory]

Authoritative record: CVE-2026-52296 at cve.org

Vendors: ffmpeg

Weaknesses: CWE-125

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-52296 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.