CVE-2026-93602

MEDIUM

4.4

CVSS v3

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.

CWE-299

How to fix

Remediation Available

rust-rustls-webpkiDebian

Fixed in:0.103.10+ds-1CVE-2026-93602

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.20%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-299 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-1675	High	8.3	0.6%	-	Fix
CVE-2026-61699	High	8.1	0.4%	-	-
CVE-2026-86231	Low	3.7	0.4%	-	-
CVE-2020-16228	Medium	6.4	0.4%	-	-
CVE-2025-3085	High	8.1	0.3%	-	Fix
CVE-2026-4428	High	7.4	0.3%	-	-

Common questions

How do I fix CVE-2026-93602?

Upgrade rust-rustls-webpki on debian unstable to 0.103.10+ds-1 or later.

Is CVE-2026-93602 being actively exploited?

Not that we know of. CVE-2026-93602 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.20% is the estimated probability that it will be exploited in the next 30 days. That is higher than 9% of all scored CVEs.

How severe is CVE-2026-93602?

CVE-2026-93602 has a CVSS v3 base score of 4.4, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-93602 affect?

Published advisories record a fix for rust-rustls-webpki (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-22.