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CVE-2026-118768— Botan: CLI utility `ocsp_check` accepts unauthenticated responses

Quick assessment

Affected
randombit botan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Botan 是一个 C++ 密码学库。在从 1.11.34 到 3.13.0 的版本中， 命令会从证书的“授权信息访问”（Authority Information Access, AIA）URL 请求 OCSP 响应，但未验证响应签名，也未对签名者进行授权。恶意响应服务器或路径攻击者可返回一个匹配且及时的"GOOD"状态响应，但附带空、无效或未授权的签名，从而导致已被吊销的证书输出退出状态码 0 并显示"OCSP 检查通过”。该问题仅影响命令行界面。此漏洞已在 3.13.0 版本中修复。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
randombit botan >= 1.11.34, < 3.13.0 affected
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I. Basic Information for CVE-2026-118768

Vulnerability Information
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Vulnerability Title
Botan: CLI utility `ocsp_check` accepts unauthenticated responses
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
randombit botan >= 1.11.34, < 3.13.0 -

II. Public POCs for CVE-2026-118768

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-118768

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Other References for CVE-2026-118768 (3)

Same Patch Batch · randombit · 2026-10-29 · 5 CVEs total

CVE-2026-118769 9.2 CRITICAL Botan: Integer overflow when reporting block size in FFI can cause memory corruption
CVE-2026-118765 7.3 HIGH Botan: AutoSeeded_RNG can become reinitialized from predictable data after clearing state
CVE-2026-118766 6.1 MEDIUM Botan: Online OCSP redirects enable blind requests to internal HTTP services
CVE-2026-118767 4.8 MEDIUM Botan: Python binding bcrypt APIs truncate passwords containing embedded NULs

IV. Related Vulnerabilities

Same product: botan
Same vendor: randombit
Same weakness: CWE-347