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CVE-2026-27586

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, two swallowed errors in `ClientAuthentication.provision()` cause mTLS client certificate authentication to silently fail open when a CA certificate file is missing, unreadable, or malformed. The server starts without error but accepts any client certificate signed by any system-trusted CA, completely bypassing the intended private CA trust boundary. Any deployment using `trusted_ca_cert_file` or `trusted_ca
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7dfb01258996fb25f3debb8ea57aa98d0a3b7f4fb05ebbb309dfa4ec986c8e93
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"caddy","vendor":"caddyserver","versions":[{"status":"affected","version":"< 2.11.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8747d30aaf896c22f8351ce2898aec99625b1a0dd12c6dc79c925a35be209b6a · sha256:43a1848e0068c718… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.8,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8747d30aaf896c22f8351ce2898aec99625b1a0dd12c6dc79c925a35be209b6a · sha256:43a1848e0068c718… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-755","description":"CWE-755: Improper Handling of Exceptional Conditions","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8747d30aaf896c22f8351ce2898aec99625b1a0dd12c6dc79c925a35be209b6a · sha256:43a1848e0068c718… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://gist.github.com/moscowchill/9566c79c76c0b64c57f8bd0716f97c48","tags":["x_refsource_MISC"],"url":"https://gist.github.com/moscowchill/9566c79c76c0b64c57f8bd0716f97c48"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8747d30aaf896c22f8351ce2898aec99625b1a0dd12c6dc79c925a35be209b6a · sha256:43a1848e0068c718… · /containers/cna/references/1
{"name":"https://github.com/caddyserver/caddy/releases/tag/v2.11.1","tags":["x_refsource_MISC"],"url":"https://github.com/caddyserver/caddy/releases/tag/v2.11.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8747d30aaf896c22f8351ce2898aec99625b1a0dd12c6dc79c925a35be209b6a · sha256:43a1848e0068c718… · /containers/cna/references/2
{"name":"https://github.com/caddyserver/caddy/security/advisories/GHSA-hffm-g8v7-wrv7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/caddyserver/caddy/security/advisories/GHSA-hffm-g8v7-wrv7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8747d30aaf896c22f8351ce2898aec99625b1a0dd12c6dc79c925a35be209b6a · sha256:43a1848e0068c718… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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