PT-2026-27355 · Crates.Io · Libcrux-Poly1305

Published 2026-03-04 · Updated 2026-03-04

OSV

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

An incorrect constant for the key length in libcrux-poly1305 caused the standalone MAC function libcrux poly1305::mac to always panic with an out-of-bounds memory access.

Impact

Applications wishing to use libcrux-poly1305 as a standalone MAC would experience panics. The use of libcrux-poly1305 in libcrux-chacha20poly1305 is unaffected.

Mitigation

Starting from version 0.0.5, the correct value is used for the key length constant.

Fix

Related Identifiers

RUSTSEC-2026-0073

Affected Products

Libcrux-Poly1305

References · 4

• https://osv.dev/vulnerability/RUSTSEC-2026-0073 · Vendor Advisory
• https://github.com/cryspen/libcrux/pull/1351 · Note
• https://crates.io/crates/libcrux-poly1305 · Note
• https://rustsec.org/advisories/RUSTSEC-2026-0073.html · Note