CVE-2026-49337

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 91% 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
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.3Exploit: NoneExposed: 0

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

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted sequence of H.265 NAL units causes decoder_context::read_slice_NAL() (libde265/decctx.cc:481) to attach slice headers to a finished picture object that has no active image unit, resulting in attacker-controlled unbounded heap growth. The retained headers are never freed until the picture is released, which may not happen during continuous streaming. Version 1.0.20 patches the issue.

CVSS v3
4.3
EG Score
4.3(medium)
EPSS
9.3%
KEV
Not listed

Published

June 19, 2026

Last Modified

June 23, 2026

Advisory Details (2)

Auto-updated Jun 19, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Unbounded memory accumulation via orphaned slice headers in `read_slice_NAL` · Advisory · strukturag/libde265 · GitHub

https://github.com/strukturag/libde265/security/advisories/GHSA-g5hj-rf9f-7vxm
github_commit Patch Available

commit 683cb9fa603e (strukturag/libde265)

Patch available: strukturag/libde265 v1.1.0 (contains commit 683cb9fa603e)

https://github.com/strukturag/libde265/commit/683cb9fa603e35840642f98765ab95cdb71cadf9

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 47× 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. 2026-07-13 11:51 UTCEG score recompute
  2. 2026-07-13 06:13 UTCEPSS rescore
  3. 2026-07-12 11:15 UTCEG score recompute
  4. 2026-07-12 05:46 UTCEPSS rescore
  5. 2026-07-11 10:39 UTCEG score recompute
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-10 10:00 UTCEG score recompute
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-09 09:25 UTCEG score recompute
  10. 2026-07-08 15:16 UTCEPSS rescore
  11. 2026-07-08 08:48 UTCEG score recompute
  12. 2026-07-07 13:46 UTCEPSS rescore
  13. 2026-07-07 08:12 UTCEG score recompute
  14. 2026-07-06 16:27 UTCEPSS rescore
  15. 2026-07-06 07:34 UTCEG score recompute
  16. 2026-07-06 02:23 UTCEPSS rescore
  17. 2026-07-05 06:58 UTCEG score recompute
  18. 2026-07-05 02:30 UTCEPSS rescore
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:21 UTCEG score recompute
  21. 2026-07-03 05:42 UTCEG score recompute
  22. 2026-07-02 05:04 UTCEG score recompute
  23. 2026-07-01 15:07 UTCEPSS rescore
  24. 2026-07-01 04:29 UTCEG score recompute
  25. 2026-06-30 23:22 UTCEPSS rescore
Show 22 more
  1. 2026-06-30 03:46 UTCEG score recompute
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-29 03:10 UTCEG score recompute
  5. 2026-06-28 14:07 UTCEPSS rescore
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-28 04:56 UTCEPSS rescore
  8. 2026-06-28 02:34 UTCEG score recompute
  9. 2026-06-27 03:08 UTCEPSS rescore
  10. 2026-06-27 01:57 UTCEG score recompute
  11. 2026-06-26 01:21 UTCEG score recompute
  12. 2026-06-25 13:49 UTCEPSS rescore
  13. 2026-06-25 00:45 UTCEG score recompute
  14. 2026-06-24 14:05 UTCEPSS rescore
  15. 2026-06-24 00:10 UTCEG score recompute
  16. 2026-06-23 21:33 UTCEPSS rescore
  17. 2026-06-23 21:33 UTCEPSS rescore
  18. 2026-06-22 23:33 UTCEG score recompute
  19. 2026-06-21 22:56 UTCEG score recompute
  20. 2026-06-20 22:15 UTCEG score recompute
  21. 2026-06-19 21:38 UTCEG score recompute
  22. 2026-06-19 21:37 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-49337?
CVE-2026-49337 is a medium vulnerability published on June 19, 2026. libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted sequence of H.265 NAL units causes decodercontext::readslice_NAL() (libde265/decctx.cc:481) to attach slice headers to a finished picture object that has no active image unit, resulting in…
When was CVE-2026-49337 disclosed?
CVE-2026-49337 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49337 actively exploited?
CVE-2026-49337 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49337?
CVE-2026-49337 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-49337?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49337, 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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