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  4. CVE 2026 18393 ffmpeg ffmpeg heap buffer overflow in
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Back to active CVEs
Medium · CVSS 5.4CVE-2026-18393

Ffmpeg: ffmpeg: heap buffer overflow in tdsc_load_cursor() via cur_fmt_mono cursorCVE-2026-18393

Answer in brief

CVE-2026-18393 records a Medium severity (CVSS 5.4) vulnerability in Ffmpeg: ffmpeg: heap buffer overflow in tdsc_load_cursor() via cur_fmt_mono cursor. The current sources do not mark it as known exploited. The current feed maps Red Hat/ffmpeg (generic), Red Hat/rhoai/odh-vllm-gaudi-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Oct 12, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.4
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/ffmpeg (generic), Red Hat/rhoai/odh-vllm-gaudi-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/ffmpeggeneric*Not reported
Red Hat/rhoai/odh-vllm-gaudi-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/ffmpeg, Red Hat/rhoai/odh-vllm-gaudi-rhel9.
  2. 2Review the reported fix. Source-reported workaround: Avoid opening untrusted TDSC-encoded video content with vulnerable FFmpeg consumers until a patched version is available.

Evidence timeline and material changes

  1. Published upstream

    Aug 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 28, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • GitHub security advisorygithub.com
  • Source referencepatchwork.ffmpeg.org
Upstream source description

A flaw was found in FFmpeg. The tdsc_load_cursor() function writes beyond the bounds of a heap-allocated buffer when processing crafted TDSC cursor data. A remote attacker could exploit this by supplying a specially crafted video file, potentially leading to a denial of service or arbitrary code execution.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • DB2 Recovery Expert for Linux, UNIX and Windows Cross-Site ScriptingSame generic ecosystem
  • IBM Db2 Recovery Expert for Linux, Unix and Windows Cross-Site ScriptingSame generic ecosystem
  • IBM Db2 Recovery Expert for Linux, Unix and Windows Cross-Site ScriptingSame generic ecosystem
  • IBM Db2 Recovery Expert for Linux, Unix and Windows Information DisclosureSame generic ecosystem
  • OpenList: Search metadata/count disclosure via Non-Separator-Aware Path Check in Bleve SearchSame generic ecosystem
  • Path traversal in Gleam via unvalidated package application namesSame generic ecosystem

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Oct 12, 2026
References
4 linked sources
Open source record