CVE-2026-44378 MEDIUM

CVE-2026-44378: Botan: Quadratic complexity decoding BER indefinite length encodings

Vendor Randombit
Product botan
Weakness CWE-407
Published May 27, 2026
Last update May 27, 2026

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

Botan is a C++ cryptography library. Prior to 3.12.0, certain patterns of indefinite length encodings in BER data could cause quadratic behavior in the parser, resulting in a denial of service. Such BER encodings were accepted even in structures which are required to be encoded as DER, which prohibits indefinite length encodings. This vulnerability is fixed in 3.12.0.

Key dates

02Disclosure timeline

May 27, 2026 CVE published
May 27, 2026 Record updated