CVE-2026-118374
LibreSSL ocspcheck through 4.4.0 Memory Exhaustion via Unbounded OCSP HTTP Response
OpenBSD LibreSSLOperating systems
CVSS
8.2HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
Description
LibreSSL ocspcheck through 4.4.0 contains a memory exhaustion vulnerability that allows malicious OCSP responders to exhaust memory by sending unbounded HTTP responses. Attackers controlling the responder or intercepting plain HTTP AIA OCSP traffic can stream endless headers or body data to http_head_read() and http_body_read(), denying certificate status checks.
Text from CVE List
Affected versions 1
- LibreSSLaffected: all versions through 4.4.0CVE List
References 6
- github.com/openbsd/src/commit/bf5da63f53179ef423d18c56d6da89eaefb56228Fixvia CVE List
- github.com/openbsd/src/commit/de4274c56c9ace88232591d4c919d79281a8de59Fixvia CVE List
- vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-memory-exhaustion-via-unbounded-ocsp-http-responseAdvisoryvia CVE List
- github.com/openbsd/src/blob/f6f428241d469cf434e60b73fc834d0448f068d5/usr.sbin/ocspcheck/http.c#L419Referencevia CVE List
- ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txtReferencevia CVE List
- github.com/libressl/portableReferencevia CVE List