CVE-2026-91863

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-21. 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 a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A specially crafted WS-Policy document with deeply nested policy elements can bypass Neethi's nesting-depth limit and exhaust the thread stack, crashing the parser (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue.

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%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
53rd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

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 21, 2026

Last Modified

September 24, 2026

Advisory Details (1)

Auto-updated Sep 21, 2026
Fix named in the CVE record.
generic
https://lists.apache.org/thread/72kxj71lvrqqx90xxqqctvpbw0t8mpxw

Vendor Advisories for CVE-2026-91863(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 25× in last 7d / 56× 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 01:55 UTCEG score recompute
  2. 2026-10-04 01:55 UTCGHSA enrichment
  3. 2026-10-03 13:44 UTCGHSA enrichment
  4. 2026-10-03 01:30 UTCEG score recompute
  5. 2026-10-03 01:30 UTCGHSA enrichment
  6. 2026-10-02 13:19 UTCGHSA enrichment
  7. 2026-10-02 01:08 UTCEG score recompute
  8. 2026-10-02 01:08 UTCGHSA enrichment
  9. 2026-10-01 19:51 UTCEPSS rescore
  10. 2026-10-01 12:55 UTCGHSA enrichment
  11. 2026-10-01 00:45 UTCEG score recompute
  12. 2026-10-01 00:44 UTCGHSA enrichment
  13. 2026-09-30 15:04 UTCEPSS rescore
  14. 2026-09-30 12:33 UTCGHSA enrichment
  15. 2026-09-30 00:21 UTCEG score recompute
  16. 2026-09-30 00:21 UTCGHSA enrichment
  17. 2026-09-29 10:29 UTCGHSA enrichment
  18. 2026-09-28 22:14 UTCEG score recompute
  19. 2026-09-28 22:14 UTCGHSA enrichment
  20. 2026-09-28 13:52 UTCEPSS rescore
  21. 2026-09-28 13:52 UTCEPSS rescore
  22. 2026-09-28 09:56 UTCGHSA enrichment
  23. 2026-09-27 21:45 UTCEG score recompute
  24. 2026-09-27 21:45 UTCGHSA enrichment
  25. 2026-09-27 13:49 UTCEPSS rescore
Show 31 more
  1. 2026-09-27 09:35 UTCGHSA enrichment
  2. 2026-09-26 21:23 UTCEG score recompute
  3. 2026-09-26 21:23 UTCGHSA enrichment
  4. 2026-09-26 15:59 UTCEPSS rescore
  5. 2026-09-26 09:10 UTCEG score recompute
  6. 2026-09-26 09:10 UTCGHSA enrichment
  7. 2026-09-25 20:57 UTCGHSA enrichment
  8. 2026-09-25 08:46 UTCGHSA enrichment
  9. 2026-09-24 20:35 UTCGHSA enrichment
  10. 2026-09-24 19:30 UTCEG score recompute
  11. 2026-09-24 19:30 UTCGHSA enrichment
  12. 2026-09-24 14:04 UTCEPSS rescore
  13. 2026-09-24 07:19 UTCGHSA enrichment
  14. 2026-09-23 19:08 UTCEG score recompute
  15. 2026-09-23 19:08 UTCGHSA enrichment
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-23 06:49 UTCGHSA enrichment
  18. 2026-09-22 18:38 UTCEG score recompute
  19. 2026-09-22 18:38 UTCGHSA enrichment
  20. 2026-09-22 16:01 UTCEPSS rescore
  21. 2026-09-22 06:28 UTCGHSA enrichment
  22. 2026-09-21 18:16 UTCEG score recompute
  23. 2026-09-21 18:16 UTCGHSA enrichment
  24. 2026-09-21 14:21 UTCGHSA enrichment
  25. 2026-09-21 13:45 UTCEG score recompute▲ 7.50
  26. 2026-09-21 13:45 UTCGHSA enrichment
  27. 2026-09-21 13:45 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  28. 2026-09-21 13:19 UTCGHSA enrichment
  29. 2026-09-21 12:29 UTCNVD update
  30. 2026-09-21 11:35 UTCEG score recompute
  31. 2026-09-21 11:35 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91863?
CVE-2026-91863 is a high vulnerability published on September 21, 2026. A specially crafted WS-Policy document with deeply nested policy elements can bypass Neethi's nesting-depth limit and exhaust the thread stack, crashing the parser (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue.
When was CVE-2026-91863 disclosed?
CVE-2026-91863 was first published on September 21, 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-2026-91863 actively exploited?
CVE-2026-91863 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-91863?
CVE-2026-91863 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-91863?
A fix for CVE-2026-91863 is available — its CVE record says: "Users are recommended to upgrade to version 3.2.4, which fixes this issue." The vendor advisories EchelonGraph has for CVE-2026-91863 are linked in the Vendor Advisories panel on this page.

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