Bug 2442407 (CVE-2026-27586)
| Summary: | CVE-2026-27586 github.com/caddyserver/caddy/v2/modules/caddytls: Caddy: Authentication bypass via mTLS client certificate validation failure | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security DevOps Team <prodsec-dev> |
| Status: | NEW --- | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | Keywords: | Security |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in Caddy, an extensible server platform. Two errors in the `ClientAuthentication.provision()` function can cause mutual Transport Layer Security (mTLS) client certificate authentication to silently fail open. This occurs when a Certificate Authority (CA) certificate file is missing, unreadable, or malformed. A remote attacker can exploit this to bypass the intended private CA trust boundary, allowing the server to accept any client certificate signed by any system-trusted CA and granting unauthorized access.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 2442430, 2442431, 2442432, 2442433 | ||
| Bug Blocks: | |||
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Description
OSIDB Bzimport
2026-02-24 17:04:56 UTC
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