CVE-2026-24850 - ML-DSA Signature Verification Accepts Signatures with Repeated Hint Indices

CVE-2026-24850 - ML-DSA Signature Verification Accepts Signatures with Repeated Hint Indices

https://cvefeed.io/rssfeed/latest.atom / Wed, 01/28/2026 - 04:59
CVE ID : CVE-2026-24850
Published : Jan. 28, 2026, 1:16 a.m. | 2 hours, 20 minutes ago
Description : The ML-DSA crate is a Rust implementation of the Module-Lattice-Based Digital Signature Standard (ML-DSA). Starting in version 0.0.4 and prior to version 0.1.0-rc.4, the ML-DSA signature verification implementation in the RustCrypto `ml-dsa` crate incorrectly accepts signatures with repeated (duplicate) hint indices. According to the ML-DSA specification (FIPS 204 / RFC 9881), hint indices within each polynomial must be **strictly increasing**. The current implementation uses a non-strict monotonic check (`<=` instead of `<`), allowing duplicate indices. This is a regression bug. The original implementation was correct, but a commit in version 0.0.4 inadvertently changed the strict `<` comparison to `<=`, introducing the vulnerability. Version 0.1.0-rc.4 fixes the issue.
Severity: 5.3 | MEDIUM
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