CVE-2026-54240

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 85% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: None knownExposed: 0

A fix is available — apply it.

libde265 is an open source implementation of the h.265 video codec. Versions prior to 1.1.1 use signed 32-bit arithmetic to calculate pixel offsets, allowing a crafted HEVC stream with large image dimensions to trigger an integer overflow and cause out-of-bounds heap reads or writes, potentially disclosing data, corrupting memory, or crashing the decoder. Version 1.1.1 contains a patch.

CVSS v3
7.4
EG Score
7.4(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 11, 2026
Patch available. Sources: github.
github Patch Available

Pixel accessor signed integer overflow causes heap OOB read/write · Advisory · strukturag/libde265 · GitHub

https://github.com/strukturag/libde265/security/advisories/GHSA-ccfw-29x7-rrx3

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibde265-examples (1.0.15-1ubuntu0.1) @ noble2026-09-20ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 29× in last 7d / 39× 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. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 17:00 UTCVendor advisory
  3. 2026-09-20 04:08 UTCEG score recompute
  4. 2026-09-20 04:08 UTCVendor advisory
  5. 2026-09-19 15:15 UTCVendor advisory
  6. 2026-09-19 02:22 UTCEG score recompute
  7. 2026-09-19 02:22 UTCVendor advisory
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-18 13:30 UTCVendor advisory
  10. 2026-09-18 00:37 UTCEG score recompute
  11. 2026-09-18 00:37 UTCVendor advisory
  12. 2026-09-17 19:31 UTCEPSS rescore
  13. 2026-09-17 11:45 UTCVendor advisory
  14. 2026-09-16 22:53 UTCEG score recompute
  15. 2026-09-16 22:53 UTCVendor advisory
  16. 2026-09-16 14:08 UTCEPSS rescore
  17. 2026-09-16 09:59 UTCEG score recompute
  18. 2026-09-16 09:59 UTCVendor advisory
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-15 21:06 UTCVendor advisory
  21. 2026-09-15 08:14 UTCEG score recompute
  22. 2026-09-15 08:14 UTCVendor advisory
  23. 2026-09-14 19:21 UTCEG score recompute
  24. 2026-09-14 19:21 UTCVendor advisory
  25. 2026-09-14 18:53 UTCEG score recompute
Show 14 more
  1. 2026-09-14 18:53 UTCVendor advisory
  2. 2026-09-14 14:50 UTCVendor advisory
  3. 2026-09-14 01:57 UTCEG score recompute
  4. 2026-09-14 01:57 UTCVendor advisory
  5. 2026-09-13 16:47 UTCEPSS rescore
  6. 2026-09-13 13:05 UTCVendor advisory
  7. 2026-09-13 00:13 UTCEG score recompute
  8. 2026-09-13 00:13 UTCVendor advisory
  9. 2026-09-12 11:20 UTCVendor advisory
  10. 2026-09-11 22:27 UTCEG score recompute
  11. 2026-09-11 22:27 UTCVendor advisory
  12. 2026-09-11 21:24 UTCEG score recompute
  13. 2026-09-11 21:24 UTCVendor advisory
  14. 2026-09-11 21:23 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-54240?
CVE-2026-54240 is a high vulnerability published on September 11, 2026. libde265 is an open source implementation of the h.265 video codec. Versions prior to 1.1.1 use signed 32-bit arithmetic to calculate pixel offsets, allowing a crafted HEVC stream with large image dimensions to trigger an integer overflow and cause out-of-bounds heap reads or writes, potentially…
When was CVE-2026-54240 disclosed?
CVE-2026-54240 was first published in the National Vulnerability Database on September 11, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54240 actively exploited?
CVE-2026-54240 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 84.8% of all scored CVEs.
What is the CVSS score of CVE-2026-54240?
CVE-2026-54240 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-54240?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54240, 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

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