randombit botan up to 3.10.x out-of-bounds

Summaryinfo

A vulnerability classified as critical has been found in randombit botan up to 3.10.x. The affected element is an unknown function. This manipulation causes out-of-bounds. This vulnerability appears as CVE-2026-32877. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in randombit botan up to 3.10.x. It has been declared as critical. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Botan is a C++ cryptography library. From version 2.3.0 to before version 3.11.0, during SM2 decryption, the code that checked the authentication code value (C3) failed to check that the encoded value was of the expected length prior to comparison. An invalid ciphertext can cause a heap over-read of up to 31 bytes, resulting in a crash or potentially other undefined behavior. This issue has been patched in version 3.11.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-32877 since 03/16/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 310592 (Fedora 44 : botan3 (2026-e7d1590ecd)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.11.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (310592). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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

License

• open-source

Website

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

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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