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CVE-2026-32884— Botan: Case-Insensitive CN Values Bypass DNS excludedSubtrees Name Constraints (RFC 5280 Violation)

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之前版本存在信任管理问题漏洞，该漏洞源于处理X.509证书路径时，对混合大小写的通用名称检查不当，可能导致绕过DNS名称约束。

CVSS 5.9 · Medium EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-32884

Vulnerability Information
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Vulnerability Title
Botan: Case-Insensitive CN Values Bypass DNS excludedSubtrees Name Constraints (RFC 5280 Violation)
Source: CVE Program / CVE List V5
Vulnerability Description
Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alternative name is defined in the end-entity certificate Botan would check that the CN was allowed by the DNS name constraints, even though this check is technically not required by RFC 5280. However this check failed to account for the possibility of a mixed-case CN. Thus a certificate with CN=Sub.EVIL.COM and no subject alternative name would bypasses an excludedSubtrees constraint for evil.com because the comparison is case-sensitive. This issue has been patched in version 3.11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A: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之前版本存在信任管理问题漏洞，该漏洞源于处理X.509证书路径时，对混合大小写的通用名称检查不当，可能导致绕过DNS名称约束。
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 -

II. Public POCs for CVE-2026-32884

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III. Intelligence Information for CVE-2026-32884

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Vendor Advisories for CVE-2026-32884 (1)

Same Patch Batch · randombit · 2026-03-30 · 3 CVEs total

CVE-2026-32877 8.2 HIGH Botan: Heap Buffer Over-read in SM2 Decryption via Undersized C3 Hash Field
CVE-2026-32883 5.9 MEDIUM Botan: Missing OCSP Response Signature Verification Allows MitM Certificate Revocation Byp

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-32884

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