CVE-2026-88370

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-24. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.3Exploit: None knownExposed services: Not assessed

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

libconfini 1.16.4 contains a heap out-of-bounds write condition involving the bundled load_ini_buffer.h utility and strip_ini_cache(). The bundled utility allocates exactly ini_length bytes, while strip_ini_cache() unconditionally writes a NUL terminator at ini_source[ini_length], requiring an additional writable byte. Applications using the bundled allocation pattern can trigger deterministic heap memory corruption when processing any non-empty INI input, resulting in denial of service.

CVSS v3
5.3
EG Score
5.3MEDIUMhigh confidence
EG Risk
28
EG Risk 28/100CISA 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
Severity53% × 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
0.3%
EPSS %ILE
19th
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 25, 2026

Advisory Details (1)

Auto-updated Sep 25, 2026
No patch confirmed yet.
generic

[Bug]heap-buffer-overflow in strip_ini_cache: unconditional ini_source[ini_length] = '\0' write contradicts bundled example (CWE-122) · Issue #20 · madmurphy/libconfini · GitHub

https://github.com/madmurphy/libconfini/issues/20

Vendor Advisories for CVE-2026-88370(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 18× in last 7d / 28× 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 07:18 UTCEG score recompute
  2. 2026-10-04 07:18 UTCGHSA enrichment
  3. 2026-10-03 05:31 UTCEG score recompute
  4. 2026-10-03 05:31 UTCGHSA enrichment
  5. 2026-10-02 03:43 UTCEG score recompute
  6. 2026-10-02 03:43 UTCGHSA enrichment
  7. 2026-10-01 19:51 UTCEPSS rescore
  8. 2026-10-01 01:56 UTCEG score recompute
  9. 2026-10-01 01:55 UTCGHSA enrichment
  10. 2026-09-30 15:04 UTCEPSS rescore
  11. 2026-09-30 00:06 UTCEG score recompute
  12. 2026-09-30 00:06 UTCGHSA enrichment
  13. 2026-09-28 21:52 UTCEG score recompute
  14. 2026-09-28 21:52 UTCGHSA enrichment
  15. 2026-09-28 13:52 UTCEPSS rescore
  16. 2026-09-27 20:05 UTCEG score recompute
  17. 2026-09-27 20:04 UTCGHSA enrichment
  18. 2026-09-27 13:48 UTCEPSS rescore
  19. 2026-09-26 18:16 UTCEG score recompute
  20. 2026-09-26 18:16 UTCGHSA enrichment
  21. 2026-09-26 15:59 UTCEPSS rescore
  22. 2026-09-25 16:26 UTCEG score recompute▲ 5.30
  23. 2026-09-25 16:26 UTCGHSA enrichment
  24. 2026-09-25 16:25 UTCNVD updateCVSS v3 → 5.3 · severity → MEDIUM
  25. 2026-09-24 21:16 UTCGHSA enrichment
Show 3 more
  1. 2026-09-24 16:30 UTCNVD update
  2. 2026-09-24 16:02 UTCEG score recompute
  3. 2026-09-24 16:01 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88370?
CVE-2026-88370 is a medium vulnerability published on September 24, 2026. libconfini 1.16.4 contains a heap out-of-bounds write condition involving the bundled loadinibuffer.h utility and stripinicache(). The bundled utility allocates exactly inilength bytes, while stripinicache() unconditionally writes a NUL terminator at inisource[ini_length], requiring an additional…
When was CVE-2026-88370 disclosed?
CVE-2026-88370 was first published on September 24, 2026, with the most recent update on September 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88370 actively exploited?
CVE-2026-88370 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88370?
CVE-2026-88370 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88370?
No fix for CVE-2026-88370 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-2026-88370 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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