CVE-2026-88377

MEDIUMPre-NVD 6.26.2—
EchelonGraph scoreHIGH confidence

Score 6.2 from GitHub Security Advisory published 2026-09-24. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
6.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 6.2Exploit: Elevated riskExposed services: Not assessed

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

Bento4 1.6.0.0 contains an integer underflow vulnerability in the avcC and hvcC configuration atom parsers. A specially crafted MP4 file containing an atom with a declared size smaller than AP4_ATOM_HEADER_SIZE can cause AP4_AvccAtom::Create() or AP4_HvccAtom::Create() to underflow the payload-size calculation. The resulting oversized buffer operation can cause invalid or NULL pointers to be passed to the AP4_DataBuffer copy path, resulting in application termination and denial of service.

CVSS v3
6.2
EG Score
6.2MEDIUMhigh confidence
EG Risk
44
EG Risk 44/100CISA SSVC

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
Severity62% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 24, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Sep 29, 2026
No patch confirmed yet.
generic

[Bug]Deterministic crash in avcC/hvcC configuration-atom parsing (AP4_AvccAtom / AP4_HvccAtom) via null pointer in AP4_DataBuffer copy (CWE-787) · Issue #1092 · axiomatic-systems/Bento4 · GitHub

https://github.com/axiomatic-systems/Bento4/issues/1092

Vendor Advisories for CVE-2026-88377(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 21× in last 7d / 26× 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. 2026-10-04 03:09 UTCEG score recompute
  2. 2026-10-04 03:09 UTCGHSA enrichment
  3. 2026-10-03 03:14 UTCEG score recompute
  4. 2026-10-03 03:14 UTCGHSA enrichment
  5. 2026-10-02 03:19 UTCEG score recompute
  6. 2026-10-02 03:19 UTCGHSA enrichment
  7. 2026-10-01 19:51 UTCEPSS rescore
  8. 2026-10-01 03:23 UTCEG score recompute
  9. 2026-10-01 03:23 UTCGHSA enrichment
  10. 2026-09-30 15:04 UTCEPSS rescore
  11. 2026-09-30 03:28 UTCEG score recompute
  12. 2026-09-30 03:28 UTCGHSA enrichment
  13. 2026-09-29 03:32 UTCEG score recompute
  14. 2026-09-29 03:31 UTCGHSA enrichment
  15. 2026-09-29 02:56 UTCEG score recompute▲ 6.20
  16. 2026-09-29 02:56 UTCGHSA enrichment
  17. 2026-09-29 02:55 UTCMITRE cvelistV5CVSS v3 → 6.2 · severity → MEDIUM
  18. 2026-09-28 13:52 UTCEPSS rescore
  19. 2026-09-27 17:25 UTCEG score recompute
  20. 2026-09-27 17:25 UTCGHSA enrichment
  21. 2026-09-27 13:48 UTCEPSS rescore
  22. 2026-09-26 15:59 UTCEPSS rescore
  23. 2026-09-24 21:16 UTCGHSA enrichment
  24. 2026-09-24 17:33 UTCNVD update
  25. 2026-09-24 16:37 UTCEG score recompute
Show 1 more
  1. 2026-09-24 16:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88377?
CVE-2026-88377 is a medium vulnerability published on September 24, 2026. Bento4 1.6.0.0 contains an integer underflow vulnerability in the avcC and hvcC configuration atom parsers. A specially crafted MP4 file containing an atom with a declared size smaller than AP4ATOMHEADERSIZE can cause AP4AvccAtom::Create() or AP4HvccAtom::Create() to underflow the payload-size…
When was CVE-2026-88377 disclosed?
CVE-2026-88377 was first published on September 24, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88377 actively exploited?
CVE-2026-88377 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88377?
CVE-2026-88377 has a CVSS v3.1 base score of 6.2 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88377?
No fix for CVE-2026-88377 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-88377 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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