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TI-2026-81662 Aliases CVE-2026-118374GHSA-3v5r-5xmx-hw5g

Memory exhaustion in LibreSSL ocspcheck via unbounded HTTP responses

Priority LOW 35CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

LibreSSL ocspcheck through 4.4.0 contains a memory exhaustion flaw because it reads OCSP HTTP responses without a size limit (CWE-770). An attacker controlling an OCSP responder, or intercepting plain HTTP AIA OCSP traffic, can stream endless headers or body data to exhaust memory and deny certificate status checks.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00212 11th percentileScored 2026-11-08
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenBSDLibreSSLup to 4.4.0—No fix listedCNA
  • LibreSSL VendorOpenBSD Affected up to 4.4.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for LibreSSL ocspcheck.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-118374
  2. 2026-10-28 Alias added: GHSA-3v5r-5xmx-hw5g
  3. 2026-10-28 Priority changed: MEDIUM → LOW
  4. 2026-11-02 CISA SSVC decision points changed

References

Patch 2

Other 3

  • TI-2020-05854 smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-19792 The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently… CVSS 3.1CRITICAL 9.8
  • TI-2002-00376 Integer overflow in xdr_array function in RPC servers for operating systems that use… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2003-00437 Off-by-one error in the fb_realpath() function, as derived from the realpath function in… CVSS 3.1CRITICAL 9.8
  • TI-2007-05153 Stack-based buffer overflow in the cons_options function in options.c in dhcpd in OpenBSD… CVSS 2.0HIGH 7.2
See all 369 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences