CVE-2025-55639

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM 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
Elevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: Elevated riskExposed: 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(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
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.

Affected Packages

(1 across 1 ecosystem)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
gpac1.0.1+dfsg1-4 ... 2.2.1+dfsg1-3.1~exp1 (13 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 52× 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.

Showing the most recent 100 of 176 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
  4. 2026-09-08 21:59 UTCEPSS rescore
  5. 2026-09-07 16:00 UTCEPSS rescore
  6. 2026-09-06 13:47 UTCEPSS rescore
  7. 2026-09-05 15:28 UTCEPSS rescore
  8. 2026-09-04 05:06 UTCEPSS rescore
  9. 2026-09-02 14:11 UTCEPSS rescore
  10. 2026-09-01 13:53 UTCEPSS rescore
  11. 2026-09-01 04:38 UTCEPSS rescore
  12. 2026-08-30 20:28 UTCEG score recompute
  13. 2026-08-30 20:28 UTCGHSA enrichment
  14. 2026-08-30 19:16 UTCEPSS rescore
  15. 2026-08-30 01:21 UTCEPSS rescore
  16. 2026-08-28 21:40 UTCEPSS rescore
  17. 2026-08-27 14:24 UTCEPSS rescore
  18. 2026-08-26 14:45 UTCEPSS rescore
  19. 2026-08-25 13:48 UTCEPSS rescore
  20. 2026-08-24 14:16 UTCEPSS rescore
  21. 2026-08-24 13:55 UTCEG score recompute
  22. 2026-08-24 13:55 UTCGHSA enrichment
  23. 2026-08-24 09:22 UTCEPSS rescore
  24. 2026-08-23 13:35 UTCEG score recompute
  25. 2026-08-23 13:35 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 00:18 UTCEPSS rescore
  2. 2026-08-22 14:53 UTCEG score recompute
  3. 2026-08-22 14:53 UTCGHSA enrichment
  4. 2026-08-21 23:48 UTCEPSS rescore
  5. 2026-08-21 06:32 UTCEG score recompute
  6. 2026-08-21 06:32 UTCGHSA enrichment
  7. 2026-08-20 22:54 UTCEPSS rescore
  8. 2026-08-20 07:49 UTCEG score recompute
  9. 2026-08-20 07:49 UTCGHSA enrichment
  10. 2026-08-19 17:03 UTCEPSS rescore
  11. 2026-08-19 04:50 UTCEG score recompute
  12. 2026-08-19 04:50 UTCGHSA enrichment
  13. 2026-08-18 13:47 UTCEPSS rescore
  14. 2026-08-17 13:46 UTCEPSS rescore
  15. 2026-08-17 08:21 UTCEG score recompute
  16. 2026-08-17 08:21 UTCGHSA enrichment
  17. 2026-08-16 14:55 UTCEPSS rescore
  18. 2026-08-16 09:39 UTCEG score recompute
  19. 2026-08-16 09:39 UTCGHSA enrichment
  20. 2026-08-16 02:13 UTCEPSS rescore
  21. 2026-08-15 10:57 UTCEG score recompute
  22. 2026-08-15 10:57 UTCGHSA enrichment
  23. 2026-08-15 01:29 UTCEPSS rescore
  24. 2026-08-14 12:14 UTCEG score recompute
  25. 2026-08-14 12:14 UTCGHSA enrichment
  26. 2026-08-13 21:59 UTCEPSS rescore
  27. 2026-08-13 13:32 UTCGHSA enrichment
  28. 2026-08-12 14:50 UTCEG score recompute
  29. 2026-08-12 14:50 UTCGHSA enrichment
  30. 2026-08-12 13:50 UTCEPSS rescore
  31. 2026-08-12 13:50 UTCEPSS rescore
  32. 2026-08-11 16:07 UTCEG score recompute
  33. 2026-08-11 16:07 UTCGHSA enrichment
  34. 2026-08-11 13:42 UTCEPSS rescore
  35. 2026-08-10 23:59 UTCEPSS rescore
  36. 2026-08-10 17:24 UTCGHSA enrichment
  37. 2026-08-09 16:46 UTCEG score recompute
  38. 2026-08-09 16:46 UTCGHSA enrichment
  39. 2026-08-09 13:46 UTCEPSS rescore
  40. 2026-08-08 18:04 UTCEG score recompute
  41. 2026-08-08 18:04 UTCGHSA enrichment
  42. 2026-08-08 16:36 UTCEPSS rescore
  43. 2026-08-07 19:21 UTCEG score recompute
  44. 2026-08-07 19:21 UTCGHSA enrichment
  45. 2026-08-07 16:26 UTCEPSS rescore
  46. 2026-08-06 20:39 UTCEG score recompute
  47. 2026-08-06 20:39 UTCGHSA enrichment
  48. 2026-08-06 13:46 UTCEPSS rescore
  49. 2026-08-05 21:56 UTCEG score recompute
  50. 2026-08-05 21:56 UTCGHSA enrichment
  51. 2026-08-05 19:16 UTCEPSS rescore
  52. 2026-08-04 23:14 UTCEG score recompute
  53. 2026-08-04 23:14 UTCGHSA enrichment
  54. 2026-08-04 15:09 UTCEPSS rescore
  55. 2026-08-04 15:09 UTCEPSS rescore
  56. 2026-08-04 10:37 UTCEPSS rescore
  57. 2026-08-04 00:32 UTCEG score recompute
  58. 2026-08-04 00:32 UTCGHSA enrichment
  59. 2026-08-03 10:35 UTCEPSS rescore
  60. 2026-08-03 01:50 UTCGHSA enrichment
  61. 2026-08-02 03:07 UTCEG score recompute
  62. 2026-08-02 03:07 UTCGHSA enrichment
  63. 2026-08-02 02:26 UTCEPSS rescore
  64. 2026-08-01 04:25 UTCEG score recompute
  65. 2026-08-01 04:25 UTCGHSA enrichment
  66. 2026-08-01 04:15 UTCEPSS rescore
  67. 2026-07-31 03:41 UTCEG score recompute
  68. 2026-07-31 03:41 UTCGHSA enrichment
  69. 2026-07-30 16:27 UTCEPSS rescore
  70. 2026-07-30 02:40 UTCEG score recompute
  71. 2026-07-30 02:40 UTCGHSA enrichment
  72. 2026-07-30 01:30 UTCEPSS rescore
  73. 2026-07-29 01:20 UTCEG score recompute
  74. 2026-07-29 01:20 UTCGHSA enrichment
  75. 2026-07-28 15:35 UTCEPSS rescore

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 1% probability of exploitation in the next 30 days, which ranks it in the top 58.0% of all scored CVEs.
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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-55639

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