# libcrux has an Incorrect Check of Signer Response Norm During Verification

Source: https://junglewise.ai/threats/libcrux-has-an-incorrect-check-of-signer-response-norm-during-d5edfd19  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-26  
License: CC BY 4.0 with a link back

Severity: medium · CVSS 4 · Published 2026-03-26

libcrux has an Incorrect Check of Signer Response Norm During Verification

Technologies: [libcrux-ml-dsa (crates.io)](https://junglewise.ai/threats/technologies/libcrux-ml-dsa). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Medium severity, with a CVSS score of 4, published 26 March 2026.

**Which products and versions are affected?** libcrux-ml-dsa (crates.io) SEMVER:introduced=0,fixed=0.0.8.

**Is there a fix for This vulnerability?** Yes. libcrux-ml-dsa (crates.io): upgrade to 0.0.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run libcrux-ml-dsa (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- libcrux-ml-dsa (crates.io): upgrade to 0.0.8 or later

  ```sh
  cargo update -p libcrux-ml-dsa
  ```


## Affected products

- libcrux-ml-dsa (crates.io) SEMVER:introduced=0,fixed=0.0.8

## Related threats

- [cryspen libcrux-ml-dsa signature verification bypass on AVX2 platforms](https://junglewise.ai/threats/cryspen-libcrux-ml-dsa-signature-verification-bypass-on-avx2-platforms-ba901d71)
- [RUSTSEC-2026-0125 - Signature Verification on AVX2 Platforms Mishandles Edge Case](https://junglewise.ai/threats/rustsec-2026-0125-signature-verification-on-avx2-platforms-mishandles-af596627)
- [RUSTSEC-2026-0126 - AVX2 Implementation Did Not Fully Reduce Intermediate Values](https://junglewise.ai/threats/rustsec-2026-0126-avx2-implementation-did-not-fully-reduce-intermediate-50fee9b7)
- [libcrux: Panic in Signature Hint Decoding During Verification](https://junglewise.ai/threats/libcrux-panic-in-signature-hint-decoding-during-verification-e5c48417)
- [RUSTSEC-2026-0077 - Incorrect Check of Signer Response Norm During Verification](https://junglewise.ai/threats/rustsec-2026-0077-incorrect-check-of-signer-response-norm-during-0c3fc337)