How severe is CVE-2026-93602?

CVE-2026-93602 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-93602 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-93602?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-93602 published?

CVE-2026-93602 was published on 2026-09-18 and last updated on 2026-09-22.

CVE-2026-93602

CVE-2026-93602 is a medium-severity vulnerability with a CVSS 3.x base score of 4.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-299.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
CVSS v4: 5.9
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-299
Published: 2026-09-18
Last modified: 2026-09-22

Description

rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 contain faulty CRL authority-matching logic that compares only the first distributionPoint against each CRL's IssuingDistributionPoint, ignoring additional distributionPoints. Attackers with a compromised trusted issuing authority can present revoked certificates that pass revocation checks under UnknownStatusPolicy::Allow, or cause incorrect errors under the default deny policy.

Frequently asked questions

What is CVE-2026-93602?: rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 contain faulty CRL authority-matching logic that compares only the first distributionPoint against each CRL's IssuingDistributionPoint, ignoring additional distributionPoints. Attackers with a compromised trusted issuing authority can present revoked certificates that pass revocation checks under UnknownStatusPolicy::Allow, or cause incorrect errors under the default deny policy.
How severe is CVE-2026-93602?: CVE-2026-93602 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-93602 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-93602?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-93602 published?: CVE-2026-93602 was published on 2026-09-18 and last updated on 2026-09-22.

References

Other CWE-299 vulnerabilities

CVE-2026-9636 — High (CVSS 8.2): A security issue exists within CompactLogix® 5380, ControlLogix® 5580, and EN4 communication modules related to CIP…
CVE-2025-11955 — High (CVSS 8.2): Incorrect validation of OCSP certificates vulnerability in TheGreenBow VPN, versions 7.5 and 7.6. During the IKEv2…
CVE-2026-61699 — High (CVSS 8.1): nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.7.1, revocation is the only…
CVE-2025-3085 — High (CVSS 8.1): A MongoDB server under specific conditions running on Linux with TLS and CRL revocation status checking enabled, fails…
CVE-2026-56821 — High (CVSS 7.4): Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final,…
CVE-2026-4428 — High (CVSS 7.4): A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly…

Browse all CWE-299 vulnerabilities →