TI-2026-82699 Aliases CVE-2026-118768

Botan ocsp_check accepts unauthenticated OCSP responses

LOW 25CWE-347Published 2026-10-29 · Updated 2026-11-03

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: Present
Impact type: Security bypass
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-347.

Summary

Botan, a C++ cryptography library, from 1.11.34 before 3.13.0 has an issue where its ocsp_check command-line utility fetches an OCSP response without verifying the response signature or the signer's authorization. A malicious responder or an on-path attacker can return a GOOD response with an invalid or unauthorized signature, so a revoked certificate passes the check (CWE-347). Only the command-line interface is affected.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

Botan is a C++ cryptography library. From 1.11.34 until 3.13.0, the botan ocsp_check command requested an OCSP response from a certificate's Authority Information Access URL without verifying the response signature or authorizing the signer. A malicious responder or on-path attacker could return a matching and timely GOOD response with an empty, invalid, or unauthorized signature, causing a revoked certificate to produce exit status 0 and OCSP check OK output. Only the command-line interface is affected. This issue is fixed in version 3.13.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0007 0th percentileScored 2026-11-07

Fix Fixed botan (randombit): 3.13.0

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

Vendor	Product	Affected versions	Fixed in	Status	Source
randombit	botan	1.11.34 to before 3.13.0	3.13.0	Patch available	CNA

botan Vendorrandombit Affected 1.11.34 to before 3.13.0 Fixed in 3.13.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:botan_project:botan::::::::	—	—	randombit

cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:* Versions — — ·randombit

Remediation

Update Botan to version 3.13.0 or later, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Fix · CNA botan (randombit) Fixed in 3.13.0

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-29 Threatist record created from CVE-2026-118768
2026-10-30 Affected versions changed · Red Hat
2026-10-30 CVSS score added · Red Hat
2026-10-31 Priority changed: MEDIUM → LOW
2026-11-03 CISA SSVC decision points changed

References

Other 3

TI-2024-33818 Botan before 3.6.0, when certain GCC versions are used, has a compiler-induced… CVSS 3.1MEDIUM 5.9
TI-2024-33817 Botan before 3.6.0, when certain LLVM versions are used, has compiler-induced… CVSS 3.1MEDIUM 5.9
TI-2016-02004 Integer overflow in the PointGFp constructor in Botan before 1.10.11 and 1.11.x before… CVSS 3.0CRITICAL 9.8
TI-2016-02005 Heap-based buffer overflow in the P-521 reduction function in Botan 1.11.x before 1.11.27… CVSS 3.0CRITICAL 9.8
TI-2026-26828 Botan has a certificate authentication bypass due to trust anchor confusion CVSS 4.0CRITICAL 9.3
TI-2016-07479 In Botan 1.8.0 through 1.11.33, when decoding BER data an integer overflow could occur… CVSS 3.0CRITICAL 9.8

See all 43 →

Sources

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