{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77281", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-20T19:14:21.331Z", "datePublished": "2026-09-17T21:04:58.400Z", "dateUpdated": "2026-09-17T21:04:58.400Z"}, "containers": {"cna": {"title": "Caddy: rewrite placeholder re-expansion", "problemTypes": [{"descriptions": [{"cweId": "CWE-94", "lang": "en", "description": "CWE-94: Improper Control of Generation of Code ('Code Injection')", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-178", "lang": "en", "description": "CWE-178: Improper Handling of Case Sensitivity", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9"}, {"name": "https://github.com/caddyserver/caddy/pull/7761", "tags": ["x_refsource_MISC"], "url": "https://github.com/caddyserver/caddy/pull/7761"}, {"name": "https://github.com/caddyserver/caddy/commit/176b043b0104cee3f894023cd5a598ac29e404bb", "tags": ["x_refsource_MISC"], "url": "https://github.com/caddyserver/caddy/commit/176b043b0104cee3f894023cd5a598ac29e404bb"}, {"name": "https://github.com/caddyserver/caddy/releases/tag/v2.11.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/caddyserver/caddy/releases/tag/v2.11.4"}], "affected": [{"vendor": "caddyserver", "product": "caddy", "versions": [{"version": "< 2.11.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-17T21:04:58.400Z"}, "descriptions": [{"lang": "en", "value": "Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, three configuration-dependent weaknesses affect the handler and placeholder layer. In modules/caddyhttp/rewrite/rewrite.go, Rewrite.Rewrite() can pass attacker-controlled replacement bytes through buildQueryString for a second placeholder expansion when a rewrite URI ends with a literal question mark, allowing injected environment or request-variable placeholders to disclose data and, when the file provider is registered, allowing injected file placeholders to disclose readable files. The issue is fixed in version 2.11.4."}], "source": {"advisory": "GHSA-j8px-rmrx-76h9", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "caddy", "vendor": "caddyserver", "versions": [{"status": "affected", "version": "< 2.11.4"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, three configuration-dependent weaknesses affect the handler and placeholder layer. In modules/caddyhttp/rewrite/rewrite.go, Rewrite.Rewrite() can pass attacker-controlled replacement bytes through buildQueryString for a second placeholder expansion when a rewrite URI ends with a literal question mark, allowing injected environment or request-variable placeholders to disclose data and, when the file provider is registered, allowing injected file placeholders to disclose readable files. The issue is fixed in version 2.11.4."}], "id": "CVE-2026-77281", "lastModified": "2026-09-17T21:17:37.890", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-17T21:17:37.890", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/caddyserver/caddy/commit/176b043b0104cee3f894023cd5a598ac29e404bb"}, {"source": "security-advisories@github.com", "url": "https://github.com/caddyserver/caddy/pull/7761"}, {"source": "security-advisories@github.com", "url": "https://github.com/caddyserver/caddy/releases/tag/v2.11.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}, {"lang": "en", "value": "CWE-178"}, {"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}