CVE-2026-90786

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-14. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

A vulnerability was determined in Dvidelabs flatcc up to 0.6.3. This impacts the function align_order_members of the file src/compiler/semantics.c of the component Duplicate Symbol Handler. This manipulation causes reachable assertion. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: 8b19ba4e992ebcad7f5970704d1afc5507fa5205. To fix this issue, it is recommended to deploy a patch.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: 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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

GitHub - dvidelabs/flatcc: FlatBuffers Compiler and Library in C for C · GitHub

https://github.com/dvidelabs/flatcc/
github_commit

commit 8b19ba4e992e (jimjag/flatcc)

Fix landed in jimjag/flatcc commit 8b19ba4e992e — awaiting tagged release

https://github.com/jimjag/flatcc/commit/8b19ba4e992ebcad7f5970704d1afc5507fa5205
generic

[Bug]reachable assert(k > 0) abort in align_order_members() when a table member is declared twice (CWE-617) · Issue #387 · dvidelabs/flatcc · GitHub

https://github.com/dvidelabs/flatcc/issues/387

Vendor Advisories for CVE-2026-90786(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 23× in last 7d / 23× 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. 2026-09-19 19:18 UTCEG score recompute
  2. 2026-09-19 19:18 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 19:26 UTCGHSA enrichment
  5. 2026-09-17 19:33 UTCEG score recompute
  6. 2026-09-17 19:33 UTCGHSA enrichment
  7. 2026-09-17 19:32 UTCEPSS rescore
  8. 2026-09-16 17:56 UTCEG score recompute
  9. 2026-09-16 17:56 UTCGHSA enrichment
  10. 2026-09-16 14:09 UTCEPSS rescore
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 16:34 UTCEG score recompute
  13. 2026-09-15 16:34 UTCGHSA enrichment
  14. 2026-09-15 16:31 UTCNVD updateCVSS v4 → 5.5
  15. 2026-09-15 15:48 UTCEG score recompute
  16. 2026-09-15 15:48 UTCGHSA enrichment
  17. 2026-09-15 15:47 UTCMITRE cvelistV5CVSS v4 → 6.9
  18. 2026-09-14 21:03 UTCEG score recompute
  19. 2026-09-14 21:03 UTCGHSA enrichment
  20. 2026-09-14 14:30 UTCEG score recompute
  21. 2026-09-14 14:29 UTCNVD updateCVSS v4 → 5.5
  22. 2026-09-14 13:40 UTCEG score recompute
  23. 2026-09-14 13:39 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-90786?
CVE-2026-90786 is a medium vulnerability published on September 14, 2026. A vulnerability was determined in Dvidelabs flatcc up to 0.6.3. This impacts the function alignordermembers of the file src/compiler/semantics.c of the component Duplicate Symbol Handler. This manipulation causes reachable assertion. The attack can be initiated remotely. The exploit has been…
When was CVE-2026-90786 disclosed?
CVE-2026-90786 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90786 actively exploited?
CVE-2026-90786 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 63.4% of all scored CVEs.
What is the CVSS score of CVE-2026-90786?
CVE-2026-90786 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-90786?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90786, 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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