CVE-2026-84185

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 100% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0

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

A flaw was found in the jwcrypto library, which is used for implementing Javascript Object Signing and Encryption (JOSE) standards. The issue occurs when the library verifies a General JSON Serialization JWS using a set of keys. Due to a coding error, the library fails to correctly identify the specific key ID (kid) and may instead accept a signature made by any valid key in the set. This can allow an attacker with a valid key to bypass authorization checks in applications that rely on the key ID to identify specific tenants or users.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: Track

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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

September 3, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Sep 3, 2026
Patch available. Sources: redhat.
redhat

2526729 – (CVE-2026-84185) CVE-2026-84185 jwcrypto: jwcrypto: General JSON JWS kid binding bypass during JWKSet verification

https://bugzilla.redhat.com/show_bug.cgi?id=2526729
redhat Patch Available

CVE-2026-84185 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-84185

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
python-jwcrypto1.1.0-1 ... 1.5.6-1.2 (7 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
python-jwcrypto1.5.6-1, 1.5.6-1.1, 1.5.6-1.1~deb13u1, 1.5.6-1.2——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
python-jwcrypto1.5.6-1, 1.5.6-1.1, 1.5.6-1.1~deb13u1, 1.5.6-1.2——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 21× 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. 2026-09-18 08:39 UTCEG score recompute
  2. 2026-09-17 19:32 UTCEPSS rescore
  3. 2026-09-17 09:48 UTCEG score recompute
  4. 2026-09-16 14:09 UTCEPSS rescore
  5. 2026-09-16 10:56 UTCEG score recompute
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-14 13:13 UTCEG score recompute
  8. 2026-09-12 15:31 UTCEG score recompute
  9. 2026-09-11 16:39 UTCEG score recompute
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-10 17:47 UTCEG score recompute
  13. 2026-09-06 17:07 UTCEG score recompute
  14. 2026-09-06 13:48 UTCEPSS rescore
  15. 2026-09-05 18:14 UTCEG score recompute
  16. 2026-09-05 15:31 UTCEPSS rescore
  17. 2026-09-04 19:22 UTCEG score recompute
  18. 2026-09-04 19:09 UTCEG score recompute
  19. 2026-09-03 21:21 UTCEG score recompute
  20. 2026-09-03 20:55 UTCEG score recompute
  21. 2026-09-03 20:53 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-84185?
CVE-2026-84185 is a medium vulnerability published on September 3, 2026. A flaw was found in the jwcrypto library, which is used for implementing Javascript Object Signing and Encryption (JOSE) standards. The issue occurs when the library verifies a General JSON Serialization JWS using a set of keys. Due to a coding error, the library fails to correctly identify the…
When was CVE-2026-84185 disclosed?
CVE-2026-84185 was first published in the National Vulnerability Database on September 3, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84185 actively exploited?
CVE-2026-84185 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 99.6% of all scored CVEs.
What is the CVSS score of CVE-2026-84185?
CVE-2026-84185 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-84185?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84185, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-84185

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