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

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 3.12.0之前版本存在安全漏洞，该漏洞源于BER数据中特定模式的不定长编码导致解析器二次行为，可能导致拒绝服务。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
randombit botan < 3.12.0 affected
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I. Basic Information for CVE-2026-44378

Vulnerability Information
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Vulnerability Title
Botan: Quadratic complexity decoding BER indefinite length encodings
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
Botan 安全漏洞
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 3.12.0之前版本存在安全漏洞，该漏洞源于BER数据中特定模式的不定长编码导致解析器二次行为，可能导致拒绝服务。
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 < 3.12.0 -

II. Public POCs for CVE-2026-44378

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III. Intelligence Information for CVE-2026-44378

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Vendor Advisories for CVE-2026-44378 (1)

IV. Related Vulnerabilities

Same product: botan
Same vendor: randombit
Same weakness: CWE-407

V. Comments for CVE-2026-44378

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