CVE-2026-18393

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-08-28. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 4 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

August 28, 2026

Last Modified

August 28, 2026

Advisory Details (4)

Auto-updated Aug 28, 2026
Patch available. Sources: redhat, github_commit.
generic

[FFmpeg-devel,PR] avcodec/tdsc: remove double stride adjustment (PR #22994) - Patchwork

https://patchwork.ffmpeg.org/project/ffmpeg/patch/177767065817.63.1948165304485903849@29965ddac10e/
github_commit

commit 242ff799c75f (FFmpeg/FFmpeg)

Fix landed in FFmpeg/FFmpeg commit 242ff799c75f — awaiting tagged release

https://github.com/FFmpeg/FFmpeg/commit/242ff799c75f20bade946314c8d741d0887ee11c
redhat

2520309 – (CVE-2026-18393) CVE-2026-18393 ffmpeg: ffmpeg: Heap buffer overflow in tdsc_load_cursor() via CUR_FMT_MONO cursor

https://bugzilla.redhat.com/show_bug.cgi?id=2520309
redhat Patch Available

CVE-2026-18393 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-18393

Vendor Advisories for CVE-2026-18393(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 21:16 UTCGHSA enrichment
  3. 2026-08-28 20:21 UTCGHSA enrichment
  4. 2026-08-28 19:03 UTCEG score recompute
  5. 2026-08-28 19:03 UTCGHSA enrichment
  6. 2026-08-28 12:23 UTCEG score recompute
  7. 2026-08-28 11:26 UTCEG score recompute
  8. 2026-08-28 11:19 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18393?
CVE-2026-18393 is a medium vulnerability published on August 28, 2026. A flaw was found in FFmpeg. The tdscloadcursor() 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…
When was CVE-2026-18393 disclosed?
CVE-2026-18393 was first published in the National Vulnerability Database on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18393 actively exploited?
CVE-2026-18393 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 83.2% of all scored CVEs.
What is the CVSS score of CVE-2026-18393?
CVE-2026-18393 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-18393?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18393, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18393

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