{"id":"CVE-2026-67293","title":"FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains an improper certificate hostname validation vulnerability","summary":"FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains an improper certificate hostname validation vulnerability. The TLS hostname matcher (tls_match_hostname() in libfreerdp/crypto/tls.c) treats a wildcard pattern such as *.exampl…","severity":"medium","cvss":4.2,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N","cwe":["CWE-295"],"vendor":"freerdp","product":"freerdp","affected":["freerdp < 3.29.0"],"patched":["freerdp 3.29.0"],"published":"2026-08-01","updated":"2026-09-29","sourceUpdated":"2026-09-29T16:17:25.597","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67293","references":[{"url":"https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5wr6-8m8j-3h7f","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-before-improper-certificate-hostname-validation","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00237,"epssPercentile":0.14666,"ingestedAt":"2026-08-02T05:17:49.523Z","slug":"CVE-2026-67293","body":"## Overview\n\nFreeRDP before 3.29.0 (affected versions <= 3.28.0) contains an improper certificate hostname validation vulnerability. The TLS hostname matcher (tls_match_hostname() in libfreerdp/crypto/tls.c) treats a wildcard pattern such as *.example.com as matching any hostname ending in .example.com, so it incorrectly accepts a wildcard certificate for multi-label subdomains like a.b.example.com (which OpenSSL's X509_check_host() rejects). This weakens TLS server authentication under wildcard-certificate conditions.\n\n## Affected\n\n- `freerdp < 3.29.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `freerdp 3.29.0`","depth":"sunlit","depthScore":23,"depthScoreParts":{"impact":23.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}