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.)
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade botan | May 15, 2025 | Oct 23, 2024 |
| Ubuntu | — | Upgrade python3-botanUpgrade python3-botan (Ubuntu Pro)Upgrade botanUpgrade libbotan-2-19Upgrade libbotan-2-dev (Ubuntu Pro)Upgrade botan (Ubuntu Pro)Upgrade libbotan-2-devUpgrade libbotan-2-19 (Ubuntu Pro) | Jun 26, 2025 | Oct 23, 2024 |
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