CVE-2026-88350

MEDIUMPre-NVD 6.26.2—
EchelonGraph scoreHIGH confidence

Score 6.2 from GitHub Security Advisory published 2026-09-22. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
6.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 6.2Exploit: 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 integer overflow vulnerability exists in MPack 1.1.1 in mpack_node_cstr_alloc() and mpack_node_utf8_cstr_alloc().

CVSS v3
6.2
EG Score
6.2MEDIUMhigh 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
Severity62% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
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 until it ships, then apply the release.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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 until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable no (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

October 1, 2026

Advisory Details (2)

Auto-updated Oct 1, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit 3d54d1215bdb (ludocode/mpack)

Fix landed in ludocode/mpack commit 3d54d1215bdb — awaiting tagged release

https://github.com/ludocode/mpack/commit/3d54d1215bdb5478d3ddecaf85884c58b382cd9b
generic

[Bug]Heap-buffer-overflow via uint32 integer overflow of (len+1) in mpack_node_cstr_alloc / mpack_node_utf8_cstr_alloc (affects 64-bit platforms too) · Issue #124 · ludocode/mpack · GitHub

https://github.com/ludocode/mpack/issues/124

Vendor Advisories for CVE-2026-88350(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 / 24× 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 23:22 UTCEPSS rescore
  2. 2026-10-04 20:32 UTCGHSA enrichment
  3. 2026-10-03 19:30 UTCEG score recompute
  4. 2026-10-03 19:30 UTCGHSA enrichment
  5. 2026-10-02 18:29 UTCEG score recompute
  6. 2026-10-02 18:29 UTCGHSA enrichment
  7. 2026-10-01 19:51 UTCEPSS rescore
  8. 2026-10-01 17:28 UTCGHSA enrichment
  9. 2026-10-01 16:43 UTCEG score recompute▲ 6.20
  10. 2026-10-01 16:43 UTCGHSA enrichment
  11. 2026-10-01 16:40 UTCMITRE cvelistV5CVSS v3 → 6.2 · severity → MEDIUM
  12. 2026-10-01 06:43 UTCEG score recompute
  13. 2026-10-01 06:43 UTCGHSA enrichment
  14. 2026-09-30 15:04 UTCEPSS rescore
  15. 2026-09-28 13:52 UTCEPSS rescore
  16. 2026-09-28 02:03 UTCGHSA enrichment
  17. 2026-09-26 15:59 UTCEPSS rescore
  18. 2026-09-24 21:23 UTCEG score recompute
  19. 2026-09-24 21:23 UTCGHSA enrichment
  20. 2026-09-24 14:04 UTCEPSS rescore
  21. 2026-09-23 17:54 UTCEPSS rescore
  22. 2026-09-22 20:32 UTCNVD update
  23. 2026-09-22 19:53 UTCEG score recompute
  24. 2026-09-22 19:52 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88350?
CVE-2026-88350 is a medium vulnerability published on September 22, 2026. An integer overflow vulnerability exists in MPack 1.1.1 in mpacknodecstralloc() and mpacknodeutf8cstr_alloc().
When was CVE-2026-88350 disclosed?
CVE-2026-88350 was first published on September 22, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88350 actively exploited?
CVE-2026-88350 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88350?
CVE-2026-88350 has a CVSS v3.1 base score of 6.2 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88350?
An upstream fix for CVE-2026-88350 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-2026-88350 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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