CVE-2026-118372
LibreSSL ocspcheck through 4.4.0 CRLF Injection via AIA OCSP URL Path
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
LibreSSL ocspcheck through 4.4.0 contains a CRLF injection vulnerability that allows attackers to inject HTTP headers by embedding CR/LF sequences in a certificate's AIA OCSP URI path. Because url2host() copies the path without rejecting control characters and http_open() places it in the POST request line, attackers can inject headers or split OCSP requests sent to the responder host.
| CWE | CWE-93 |
| Vendor | openbsd |
| Product | libressl |
| Published | Oct 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
OpenBSD / LibreSSL
0 ≤ 4.4.0
References
github.com: https://github.com/openbsd/src/commit/6efdc4cce3fac9fa7208a9452f84de34c5a68e9f github.com: https://github.com/openbsd/src/commit/3adb7688a5bcfb675fa6d8b10e242022d620a23d github.com: https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/http.c#L344 github.com: https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/ocspcheck.c#L154 ftp.openbsd.org: https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt github.com: https://github.com/libressl/portable vulncheck.com: https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-crlf-injection-via-aia-ocsp-url-path
Credits
Aziz Elbelaychy (Ostorlab) Kenjiro Nakayama