CVE-2026-93602Network attack vectorHinoki check available

Revoked credential acceptance via incomplete distributionPoint matching

Published Sep 18, 2026 · Updated Sep 18, 2026

Certificate revocation bypass in Rustls rustls-webpki before 0.103.10 and before 0.104.0-alpha.5 allows attackers to reuse revoked credentials. The authority-matching logic compares only the certificate's first distributionPoint with each CRL's IssuingDistributionPoint and ignores later entries, so the applicable CRL is not consulted. Exploitation requires control of a trusted issuing authority; UnknownStatusPolicy::Allow accepts the revoked certificate, while the default deny policy returns a safe error.

CVSS severity5.9
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Certificate revocation bypass in Rustls rustls-webpki before 0.103.10 and before 0.104.0-alpha.5 allows attackers to reuse revoked credentials. The authority-matching logic compares only the certificate's first distributionPoint with each CRL's IssuingDistributionPoint and ignores later entries, so the applicable CRL is not consulted. Exploitation requires control of a trusted issuing authority; UnknownStatusPolicy::Allow accepts the revoked certificate, while the default deny policy returns a safe error.

The record

CVE
CVE-2026-93602
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Rustls
Product
rustls-webpki
Classifications
CWE-299, T1078
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.102.0-alpha.0 <0.103.10
  2. Affected versionversion=0.104.0-alpha.1 <0.104.0-alpha.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Rustls · rustls-webpkiversion=0.102.0-alpha.0 <0.103.10; version=0.104.0-alpha.1 <0.104.0-alpha.5

Published CVSS scores

5.9VulnCheckCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
4.4RustlsCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-299Improper Check for Certificate Revocation
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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