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CVE-2026-34580— Botan has a certificate authentication bypass due to trust anchor confusion

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Jack Lloyd个人开发者的一个C++加密库。 Botan 3.11.0版本存在信任管理问题漏洞，该漏洞源于Certificate_Store::certificate_known函数逻辑错误，可能导致接受不匹配的终端实体证书。

AI Predicted 5.3 Difficulty: Easy EPSS 0.32% · P23

Affected Version Matrix 1

VendorProduct Version RangeStatus
randombit botan >= 3.11.0, < 3.11.1 affected
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I. Basic Information for CVE-2026-34580

Vulnerability Information
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Vulnerability Title
Botan has a certificate authentication bypass due to trust anchor confusion
Source: CVE Program / CVE List V5
Vulnerability Description
Botan is a C++ cryptography library. In 3.11.0, the function Certificate_Store::certificate_known had a misleading name; it would return true if any certificate in the store had a DN (and subject key identifier, if set) matching that of the argument. It did not check that the cert it found and the cert it was passed were actually the same certificate. In 3.11.0 an extension of path validation logic was made which assumed that certificate_known only returned true if the certificates were in fact identical. The impact is that if an end entity certificate is presented, and its DN (and subject key identifier, if set) match that of any trusted root, the end entity certificate is accepted immediately as if it itself were a trusted root. , This vulnerability is fixed in 3.11.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Botan 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Botan是Jack Lloyd个人开发者的一个C++加密库。 Botan 3.11.0版本存在信任管理问题漏洞，该漏洞源于Certificate_Store::certificate_known函数逻辑错误，可能导致接受不匹配的终端实体证书。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
randombit botan >= 3.11.0, < 3.11.1 -

II. Public POCs for CVE-2026-34580

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III. Intelligence Information for CVE-2026-34580

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IV. Related Vulnerabilities

Same product: botan
Same vendor: randombit
Same weakness: CWE-295

V. Comments for CVE-2026-34580

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