CVE-2026-118374: OpenBSD LibreSSL

LibreSSL ocspcheck through 4.4.0 Memory Exhaustion via Unbounded OCSP HTTP Response

CVSS 8.2 HighEPSS 0.0021 · 11th percentile

Published by the CVE Program (CNA: VulnCheck) at 28 Oct 2026, 02:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
OpenBSD	LibreSSL pkg:github/libressl/portable	affected 4.4.0 and earlier semver Other versions: unaffected

Identifiers

CVE-2026-118374

CNA

VulnCheck

Weakness (CWE)

CWE-770

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.2	High	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record
5.9	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0021, the 11th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

28 Oct 2026, 02:03 UTC Confirmed by the CVE List
28 Oct 2026, 03:17 UTC Confirmed by NVD

Sources

References from the CNA

github.com/openbsd/src/commit/bf5da63f53179ef423d18c56d6da89eaefb56228 patch
github.com/openbsd/src/commit/de4274c56c9ace88232591d4c919d79281a8de59 patch
github.com/openbsd/src/blob/f6f428241d469cf434e60b73fc834d0448f068d5/usr.sbin/ocspcheck/http.c#L419 technical-description
ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt release-notes
github.com/libressl/portable product
www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-memory-exhaustion-via-unbounded-ocsp-http-response third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.