CVE-2025-55639

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-06-23. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

GPAC MP4Box v2.4 was discovered to contain a NULL pointer dereference in the gf_isom_add_track_kind() function at isomedia/isom_write.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted MP4 file.

CVSS v3
6.5
EG Score
6.5(high)
EPSS
27.2%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 30, 2026

Advisory Details (4)

Auto-updated Jun 23, 2026
Patch available. Sources: github_commit.
generic

sigdevel: "Security Advisory: CVE-2025-55639 - NULL Pointer …" - Infosec Exchange

https://infosec.exchange/@sigdevel/116769184815236865
github_commit Patch Available

commit 027ce139dda4 (gpac/gpac)

Patch available: gpac/gpac v26.02.0 (contains commit 027ce139dda4)

https://github.com/gpac/gpac/commit/027ce139dda498ee95df36db9f9f6f3cadce8ec9
generic

pocs/res/gpac/MP4Box/23/23_poc.mp4 at main · sigdevel/pocs · GitHub

https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/23/23_poc.mp4
generic

[security] isomedia/isom_write.c:3153 null-pointer dereference in gf_isom_add_track_kind · Issue #3260 · gpac/gpac · GitHub

https://github.com/gpac/gpac/issues/3260

Vendor Advisories for CVE-2025-55639(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 25× in last 7d / 46× 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. 2026-07-07 05:45 UTCEG score recompute
  2. 2026-07-07 05:45 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 07:02 UTCEG score recompute
  6. 2026-07-06 07:01 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 08:19 UTCEG score recompute
  10. 2026-07-05 08:19 UTCGHSA enrichment
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-04 09:35 UTCEG score recompute
  13. 2026-07-04 09:35 UTCGHSA enrichment
  14. 2026-07-04 06:30 UTCEPSS rescore
  15. 2026-07-03 10:52 UTCEG score recompute
  16. 2026-07-03 10:51 UTCGHSA enrichment
  17. 2026-07-02 17:01 UTCEPSS rescore
  18. 2026-07-02 12:01 UTCEG score recompute
  19. 2026-07-02 12:01 UTCGHSA enrichment
  20. 2026-07-01 15:06 UTCEPSS rescore
  21. 2026-07-01 13:18 UTCEG score recompute
  22. 2026-07-01 13:18 UTCGHSA enrichment
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-30 14:31 UTCEG score recompute
  25. 2026-06-30 14:30 UTCGHSA enrichment
Show 21 more
  1. 2026-06-29 15:46 UTCEG score recompute
  2. 2026-06-29 15:45 UTCGHSA enrichment
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-29 14:06 UTCEPSS rescore
  5. 2026-06-28 17:01 UTCEG score recompute
  6. 2026-06-28 17:01 UTCGHSA enrichment
  7. 2026-06-28 14:07 UTCEPSS rescore
  8. 2026-06-28 14:07 UTCEPSS rescore
  9. 2026-06-28 04:55 UTCEPSS rescore
  10. 2026-06-27 18:18 UTCEG score recompute
  11. 2026-06-27 18:18 UTCGHSA enrichment
  12. 2026-06-27 03:08 UTCEPSS rescore
  13. 2026-06-27 03:08 UTCEPSS rescore
  14. 2026-06-26 19:35 UTCEG score recompute▲ 6.50
  15. 2026-06-26 19:35 UTCGHSA enrichment
  16. 2026-06-25 13:49 UTCEPSS rescore
  17. 2026-06-24 14:04 UTCEPSS rescore
  18. 2026-06-24 14:04 UTCEPSS rescore
  19. 2026-06-23 17:30 UTCMITRE cvelistV5CVSS v3 → 6.5 · severity → MEDIUM
  20. 2026-06-23 15:47 UTCEG score recompute
  21. 2026-06-23 15:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-55639?
CVE-2025-55639 is a medium vulnerability published on June 23, 2026. GPAC MP4Box v2.4 was discovered to contain a NULL pointer dereference in the gfisomaddtrackkind() function at isomedia/isom_write.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted MP4 file.
When was CVE-2025-55639 disclosed?
CVE-2025-55639 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-55639 actively exploited?
CVE-2025-55639 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-55639?
CVE-2025-55639 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-55639?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-55639, 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-2025-55639

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