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CVE-2026-32883— Botan: Missing OCSP Response Signature Verification Allows MitM Certificate Revocation Bypass

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 3.0.0至3.11.0之前版本存在数据伪造问题漏洞，该漏洞源于X509路径验证过程中未验证OCSP响应的签名。

CVSS 5.9 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-32883

Vulnerability Information
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Vulnerability Title
Botan: Missing OCSP Response Signature Verification Allows MitM Certificate Revocation Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Botan is a C++ cryptography library. From version 3.0.0 to before version 3.11.0, during X509 path validation, OCSP responses were checked for an appropriate status code, but critically omitted verifying the signature of the OCSP response itself. 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
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Botan 数据伪造问题漏洞
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 3.0.0至3.11.0之前版本存在数据伪造问题漏洞，该漏洞源于X509路径验证过程中未验证OCSP响应的签名。
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 >= 3.0.0, < 3.11.0 -

II. Public POCs for CVE-2026-32883

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III. Intelligence Information for CVE-2026-32883

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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-2026-32884 5.9 MEDIUM Botan: Case-Insensitive CN Values Bypass DNS excludedSubtrees Name Constraints (RFC 5280 V

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-32883

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