CVE-2026-88344

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-22. 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

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

An out-of-bounds read vulnerability exists in the schema lexer of flatcc 4c3b999e. When an exact-length FlatBuffers schema buffer ends with a digit, the integer digit-scan loop in lex() advances past the end of the input buffer and dereferences the out-of-bounds pointer. A specially crafted schema can trigger a one-byte heap buffer over-read, resulting in application crash and denial of service.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
49
EG Risk 49/100CISA 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%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. 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 until it ships, then apply the release.
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

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

An upstream fix is merged but not yet in a tagged release. 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 until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable yes (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 22, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Sep 23, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit c1dcc8ecd1a7 (jimjag/flatcc)

Fix landed in jimjag/flatcc commit c1dcc8ecd1a7 — awaiting tagged release

https://github.com/jimjag/flatcc/commit/c1dcc8ecd1a74b1e9e724ec7dc98828a5c95528e
generic

[Bug]heap buffer over-read in lex() integer digit-scan loop when a trailing digit ends the exact-length schema buffer (CWE-122) · Issue #384 · dvidelabs/flatcc · GitHub

https://github.com/dvidelabs/flatcc/issues/384

Vendor Advisories for CVE-2026-88344(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 27× in last 7d / 50× 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 15:19 UTCGHSA enrichment
  2. 2026-10-04 03:31 UTCGHSA enrichment
  3. 2026-10-03 15:52 UTCEG score recompute
  4. 2026-10-03 15:52 UTCGHSA enrichment
  5. 2026-10-03 04:06 UTCEG score recompute
  6. 2026-10-03 04:06 UTCGHSA enrichment
  7. 2026-10-02 16:26 UTCGHSA enrichment
  8. 2026-10-02 16:24 UTCGHSA enrichment
  9. 2026-10-02 04:43 UTCEG score recompute
  10. 2026-10-02 04:43 UTCGHSA enrichment
  11. 2026-10-01 19:51 UTCEPSS rescore
  12. 2026-10-01 17:02 UTCGHSA enrichment
  13. 2026-10-01 05:20 UTCGHSA enrichment
  14. 2026-09-30 17:40 UTCEG score recompute
  15. 2026-09-30 17:40 UTCGHSA enrichment
  16. 2026-09-30 15:04 UTCEPSS rescore
  17. 2026-09-30 05:59 UTCGHSA enrichment
  18. 2026-09-29 18:18 UTCEG score recompute
  19. 2026-09-29 18:18 UTCGHSA enrichment
  20. 2026-09-29 06:26 UTCEG score recompute
  21. 2026-09-29 06:26 UTCGHSA enrichment
  22. 2026-09-28 18:47 UTCEG score recompute
  23. 2026-09-28 18:47 UTCGHSA enrichment
  24. 2026-09-28 13:52 UTCEPSS rescore
  25. 2026-09-28 07:07 UTCGHSA enrichment
Show 25 more
  1. 2026-09-27 19:27 UTCEG score recompute
  2. 2026-09-27 19:26 UTCGHSA enrichment
  3. 2026-09-27 13:48 UTCEPSS rescore
  4. 2026-09-27 07:46 UTCGHSA enrichment
  5. 2026-09-26 20:06 UTCEG score recompute
  6. 2026-09-26 20:06 UTCGHSA enrichment
  7. 2026-09-26 15:59 UTCEPSS rescore
  8. 2026-09-26 08:25 UTCEG score recompute
  9. 2026-09-26 08:25 UTCGHSA enrichment
  10. 2026-09-25 20:44 UTCGHSA enrichment
  11. 2026-09-25 09:03 UTCGHSA enrichment
  12. 2026-09-24 21:23 UTCEG score recompute
  13. 2026-09-24 21:23 UTCGHSA enrichment
  14. 2026-09-24 14:04 UTCEPSS rescore
  15. 2026-09-24 12:40 UTCGHSA enrichment
  16. 2026-09-24 00:59 UTCEG score recompute
  17. 2026-09-24 00:59 UTCGHSA enrichment
  18. 2026-09-23 17:54 UTCEPSS rescore
  19. 2026-09-23 13:19 UTCGHSA enrichment
  20. 2026-09-23 12:21 UTCEG score recompute▲ 7.50
  21. 2026-09-23 12:21 UTCGHSA enrichment
  22. 2026-09-23 12:20 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  23. 2026-09-22 20:32 UTCNVD update
  24. 2026-09-22 19:48 UTCEG score recompute
  25. 2026-09-22 19:47 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88344?
CVE-2026-88344 is a high vulnerability published on September 22, 2026. An out-of-bounds read vulnerability exists in the schema lexer of flatcc 4c3b999e. When an exact-length FlatBuffers schema buffer ends with a digit, the integer digit-scan loop in lex() advances past the end of the input buffer and dereferences the out-of-bounds pointer. A specially crafted schema…
When was CVE-2026-88344 disclosed?
CVE-2026-88344 was first published on September 22, 2026, with the most recent update 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-2026-88344 actively exploited?
CVE-2026-88344 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88344?
CVE-2026-88344 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88344?
An upstream fix for CVE-2026-88344 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-88344 are linked in the Vendor Advisories panel on this page.

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