randombit Botan up to 3.12.x Scrypt implementation heap-based overflow

Summaryinfo

A vulnerability was found in randombit Botan up to 3.12.x. It has been declared as critical. Affected by this issue is some unknown functionality of the component Scrypt implementation. Such manipulation leads to heap-based overflow. This vulnerability is listed as CVE-2026-104267. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in randombit Botan up to 3.12.x and classified as critical. Affected by this issue is some unknown processing of the component Scrypt implementation. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. The product writes past the end of a buffer that was allocated on the heap. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Botan is a C++ cryptography library. From 2.7.0 until 3.13.0, Botan's Scrypt implementation on 32-bit platforms computes required memory with unchecked multiplication, allowing attacker-controlled Scrypt parameters to wrap the allocation size and create a buffer smaller than the algorithm subsequently writes. The issue affects systems that enable Scrypt and accept arbitrary parameters from a hostile source, including applications that decrypt attacker-supplied encrypted private keys. A triggering parameter set can cause approximately four gigabytes of Scrypt output to be written past the allocated heap buffer, immediately crashing the process and causing denial of service. Arbitrary code execution is not demonstrated and appears difficult, but cannot be excluded from the overwrite primitive. This issue is fixed in version 3.13.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-104267 since 10/01/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 3.13.0 eliminates this vulnerability.

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Productinfo

Vendor

• randombit

Name

• Botan

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12

License

• open-source

Website

• Product: https://github.com/randombit/botan/

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