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GHSA-435g-fcv3-8j26

Bug-Fixes in `libcrux-ecdh`, `libcrux-ed25519`, `libcrux-psq`

Also known asRUSTSEC-2026-0023RUSTSEC-2026-0024RUSTSEC-2026-0025RUSTSEC-2026-0026
Published
Feb 12, 2026
Updated
Feb 28, 2026
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed

Blast Radius

3 pkgs affected
🦀libcrux-ecdh🦀libcrux-ed25519🦀libcrux-psq

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

In accordance with our security policy for libcrux, we publish a GitHub security advisory for any releases whose CHANGELOG includes bug-fixes, and encourage our users to upgrade. The latest releases of the libcrux-ecdh, libcrux-ed25519 and libcrux-psq crates contain the following bug-fixes:

libcrux-ecdh

  • #1301: Check length and clamping in X25519 secret validation. This is a breaking change since errors are now raised on unclamped X25519 secrets or inputs of the wrong length

libcrux-ed25519

  • #1320: Remove duplicated clamping step during key generation

The issue fixed in #1320 was first reported by Nadim Kobeissi.

libcrux-psq

  • #1319: Propagate AEADError instead of panicking
  • #1301: Fix broken clamping check for imported X25519 secret keys

The issue fixed in #1319 was first reported by Nadim Kobeissi.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iolibcrux-ecdhall versions0.0.6
🦀crates.iolibcrux-ed25519all versions0.0.6
🦀crates.iolibcrux-psqall versions0.0.7

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for libcrux-ecdh. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update libcrux-ecdh to 0.0.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-435g-fcv3-8j26 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether GHSA-435g-fcv3-8j26 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-435g-fcv3-8j26. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

In accordance with our [security policy for `libcrux`](https://github.com/cryspen/libcrux/blob/main/SECURITY.md), we publish a GitHub security advisory for any releases whose CHANGELOG includes bug-fixes, and encourage our users to upgrade. The latest releases of the `libcrux-ecdh`, `libcrux-ed25519` and `libcrux-psq` crates contain the following bug-fixes: ## `libcrux-ecdh` - [#1301](https://github.com/cryspen/libcrux/pull/1301): Check length and clamping in X25519 secret validation. This is a breaking change since errors are now raised on unclamped X25519 secrets or inputs of the wrong len
O3 Security · Impact-Aware SCA

Is GHSA-435g-fcv3-8j26 in your dependencies?

O3 detects GHSA-435g-fcv3-8j26 across crates.io dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.