CVE-2024-50383

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-10-23 · updated 2026-06-17
Weakness: CWE-203

Description

Botan before 3.6.0, when certain GCC versions are used, has a compiler-induced secret-dependent operation in lib/utils/donna128.h in donna128 (used in Chacha-Poly1305 and x25519). An addition can be skipped if a carry is not set. This was observed for GCC 11.3.0 with -O2 on MIPS, and GCC on x86-i386. (Only 32-bit processors can be affected.)

Affected products

randombit botan: before 3.6.0 — fixed in 3.6.0

How to fix

Upgrade to a fixed version: randombit botan 3.6.0. Check the vendor advisory for mitigations.

References

https://arxiv.org/pdf/2410.13489
https://github.com/randombit/botan/commit/53b0cfde580e86b03d0d27a488b6c134f662e957
https://github.com/randombit/botan/compare/3.5.0...3.6.0
https://news.ycombinator.com/item?id=41887153

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