CVE-2026-88345

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 — 5 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

An out-of-bounds read vulnerability exists in the schema lexer of flatcc 4c3b999e. When an exact-length FlatBuffers schema ends with an unterminated quotation mark, the C-string scanning logic in lex() dereferences the input pointer after it has reached the end of the buffer. 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
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

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 8581715e8ec4 (jimjag/flatcc)

Fix landed in jimjag/flatcc commit 8581715e8ec4 — awaiting tagged release

https://github.com/jimjag/flatcc/commit/8581715e8ec4e5de8eea9fd6dad949e4dd7d0fa0
generic

[Bug]heap buffer over-read in lex() C-string scan: *p dereferenced after reaching end of buffer on an unterminated trailing quote (CWE-122) · Issue #385 · dvidelabs/flatcc · GitHub

https://github.com/dvidelabs/flatcc/issues/385

Vendor Advisories for CVE-2026-88345(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 15× in last 7d / 15× 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. 2026-09-25 09:03 UTCGHSA enrichment
  2. 2026-09-24 21:18 UTCGHSA enrichment
  3. 2026-09-24 15:03 UTCEG score recompute
  4. 2026-09-24 15:03 UTCGHSA enrichment
  5. 2026-09-24 14:04 UTCEPSS rescore
  6. 2026-09-24 03:06 UTCEG score recompute
  7. 2026-09-24 03:06 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 15:20 UTCGHSA enrichment
  10. 2026-09-23 15:14 UTCEG score recompute▲ 7.50
  11. 2026-09-23 15:14 UTCGHSA enrichment
  12. 2026-09-23 15:14 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  13. 2026-09-22 20:32 UTCNVD update
  14. 2026-09-22 19:48 UTCEG score recompute
  15. 2026-09-22 19:47 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88345?
CVE-2026-88345 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 ends with an unterminated quotation mark, the C-string scanning logic in lex() dereferences the input pointer after it has reached the end of the buffer. A specially crafted…
When was CVE-2026-88345 disclosed?
CVE-2026-88345 was first published in the National Vulnerability Database 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-2026-88345 actively exploited?
CVE-2026-88345 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 67.0% of all scored CVEs.
What is the CVSS score of CVE-2026-88345?
CVE-2026-88345 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88345?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88345, 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

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