CVE-2026-88376

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-24. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed 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 AP4_AvccAtom::Create() and AP4_HvccAtom::Create(). A specially crafted MP4 file containing an avcC or hvcC atom with a declared size smaller than the atom header size can cause the payload-size calculation to wrap to a large unsigned value. The resulting invalid buffer allocation and copy operations can cause application termination, leading to denial of service.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
38
EG Risk 38/100CISA 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend 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 at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend 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 at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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 24, 2026

Advisory Details (1)

Auto-updated Sep 24, 2026
No patch confirmed yet.
generic

[Bug]Deterministic SIGILL in avcC/hvcC configuration-atom parsing (AP4_AvccAtom / AP4_HvccAtom) via unvalidated atom size (CWE-787) · Issue #1091 · axiomatic-systems/Bento4 · GitHub

https://github.com/axiomatic-systems/Bento4/issues/1091

Vendor Advisories for CVE-2026-88376(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 24× in last 7d / 40× 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 02:11 UTCEG score recompute
  2. 2026-10-04 02:11 UTCGHSA enrichment
  3. 2026-10-03 13:56 UTCGHSA enrichment
  4. 2026-10-03 01:40 UTCEG score recompute
  5. 2026-10-03 01:40 UTCGHSA enrichment
  6. 2026-10-02 13:26 UTCGHSA enrichment
  7. 2026-10-02 01:11 UTCEG score recompute
  8. 2026-10-02 01:11 UTCGHSA enrichment
  9. 2026-10-01 19:51 UTCEPSS rescore
  10. 2026-10-01 12:57 UTCGHSA enrichment
  11. 2026-10-01 00:43 UTCEG score recompute
  12. 2026-10-01 00:43 UTCGHSA enrichment
  13. 2026-09-30 15:04 UTCEPSS rescore
  14. 2026-09-30 12:29 UTCGHSA enrichment
  15. 2026-09-30 00:13 UTCEG score recompute
  16. 2026-09-30 00:13 UTCGHSA enrichment
  17. 2026-09-29 11:59 UTCGHSA enrichment
  18. 2026-09-28 23:41 UTCEG score recompute
  19. 2026-09-28 23:41 UTCGHSA enrichment
  20. 2026-09-28 13:52 UTCEPSS rescore
  21. 2026-09-28 11:26 UTCGHSA enrichment
  22. 2026-09-27 23:12 UTCEG score recompute
  23. 2026-09-27 23:12 UTCGHSA enrichment
  24. 2026-09-27 13:48 UTCEPSS rescore
  25. 2026-09-27 10:57 UTCGHSA enrichment
Show 15 more
  1. 2026-09-26 22:43 UTCEG score recompute
  2. 2026-09-26 22:43 UTCGHSA enrichment
  3. 2026-09-26 15:59 UTCEPSS rescore
  4. 2026-09-26 10:30 UTCEG score recompute
  5. 2026-09-26 10:29 UTCGHSA enrichment
  6. 2026-09-25 22:13 UTCGHSA enrichment
  7. 2026-09-25 09:30 UTCEG score recompute
  8. 2026-09-25 09:30 UTCGHSA enrichment
  9. 2026-09-24 21:16 UTCGHSA enrichment
  10. 2026-09-24 19:35 UTCEG score recompute▲ 7.50
  11. 2026-09-24 19:35 UTCGHSA enrichment
  12. 2026-09-24 19:34 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  13. 2026-09-24 17:33 UTCNVD update
  14. 2026-09-24 16:37 UTCEG score recompute
  15. 2026-09-24 16:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88376?
CVE-2026-88376 is a high vulnerability published on September 24, 2026. Bento4 1.6.0.0 contains an integer underflow vulnerability in AP4AvccAtom::Create() and AP4HvccAtom::Create(). A specially crafted MP4 file containing an avcC or hvcC atom with a declared size smaller than the atom header size can cause the payload-size calculation to wrap to a large unsigned…
When was CVE-2026-88376 disclosed?
CVE-2026-88376 was first published on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88376 actively exploited?
CVE-2026-88376 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88376?
CVE-2026-88376 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88376?
No fix for CVE-2026-88376 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-2026-88376 are linked in the Vendor Advisories panel on this page.

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