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CVE-2026-118766— Botan: Online OCSP redirects enable blind requests to internal HTTP services

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 3.13.0 版本之前，Botan 的在线 OCSP 客户端在向证书“权威信息访问”（Authority Information Access）扩展中指定的 URI 发送 OCSP 请求时，允许进行一次 HTTP 重定向。恶意的 OCSP 响应服务器或路径上的攻击者可以利用此行为，将客户端重定向至原本无法访问的内部 HTTP 服务，从而发起一次“盲”请求。该漏洞的主要影响是盲 SSRF（服务器端请求伪造），可能影响那些处理非幂等 GET 请求的内部服务；此外，通过测量响应时

CVSS 6.1 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
randombit botan < 3.13.0 affected
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I. Basic Information for CVE-2026-118766

Vulnerability Information
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Vulnerability Title
Botan: Online OCSP redirects enable blind requests to internal HTTP services
Source: CVE Program / CVE List V5
Vulnerability Description
Botan is a C++ cryptography library. Prior to 3.13.0, Botan's online OCSP client allowed a single HTTP redirect while posting an OCSP request to the URI in a certificate's Authority Information Access extension. A malicious OCSP responder or an on-path attacker could redirect the client to make one blind request to an otherwise unreachable internal HTTP service. The primary impact is blind SSRF that might affect internal services with non-idempotent GET handlers, and response timing can provide a coarse internal-service oracle. This issue is fixed in version 3.13.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
randombit botan < 3.13.0 -

II. Public POCs for CVE-2026-118766

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III. Intelligence Information for CVE-2026-118766

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Other References for CVE-2026-118766 (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-2026-118768 5.9 MEDIUM Botan: CLI utility `ocsp_check` accepts unauthenticated responses
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-918