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CVE-2026-27590

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's FastCGI path splitting logic computes the split index on a lowercased copy of the request path and then uses that byte index to slice the original path. This is unsafe for Unicode because `strings.ToLower()` can change UTF-8 byte length for some characters. As a result, Caddy can derive an incorrect `SCRIPT_NAME`/`SCRIPT_FILENAME` and `PATH_INFO`, potentially causing a request that contains `.php` t
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:bf0c78a3eead2d07e0765824b7053c458fc3cc55eb308a9946f2984c2dc0e7f7
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-180","description":"CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:97131b5955a345fb5d11633793e81e408a46fb412ddba8846cbdf536f2fd9ada · sha256:197b7307dc6899db… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:97131b5955a345fb5d11633793e81e408a46fb412ddba8846cbdf536f2fd9ada · sha256:197b7307dc6899db… · /containers/cna/problemTypes/0/descriptions/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:v2:97131b5955a345fb5d11633793e81e408a46fb412ddba8846cbdf536f2fd9ada · sha256:197b7307dc6899db… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.9,"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:H/SC:N/SI:N/SA:N/E:P","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:97131b5955a345fb5d11633793e81e408a46fb412ddba8846cbdf536f2fd9ada · sha256:197b7307dc6899db… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-180","description":"CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:97131b5955a345fb5d11633793e81e408a46fb412ddba8846cbdf536f2fd9ada · sha256:197b7307dc6899db… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:97131b5955a345fb5d11633793e81e408a46fb412ddba8846cbdf536f2fd9ada · sha256:197b7307dc6899db… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"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:v2:97131b5955a345fb5d11633793e81e408a46fb412ddba8846cbdf536f2fd9ada · sha256:197b7307dc6899db… · /containers/cna/references/2
{"name":"https://github.com/caddyserver/caddy/security/advisories/GHSA-5r3v-vc8m-m96g","tags":["x_refsource_CONFIRM"],"url":"https://github.com/caddyserver/caddy/security/advisories/GHSA-5r3v-vc8m-m96g"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:97131b5955a345fb5d11633793e81e408a46fb412ddba8846cbdf536f2fd9ada · sha256:197b7307dc6899db… · /containers/cna/references/0
{"name":"https://github.com/php/frankenphp/security/advisories/GHSA-g966-83w7-6w38","tags":["x_refsource_MISC"],"url":"https://github.com/php/frankenphp/security/advisories/GHSA-g966-83w7-6w38"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:97131b5955a345fb5d11633793e81e408a46fb412ddba8846cbdf536f2fd9ada · sha256:197b7307dc6899db… · /containers/cna/references/1

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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