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Medium, CVSS 5.6amended

Hybrid Encapsulation from Seed Panics on Short Seed

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (libcrux-kem 0.0.10), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • crates.io libcrux-kem

    Affected
    >= 0.0.0-0, < 0.0.10
    Fixed in
    0.0.10

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.6 · CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

For a hybrid KEM public key of type `PublicKey::WingKemDraft06` or `PublicKey::X25519MlKem768Draft06`, the `PublicKey::encapsulate_derand` function would panic in an indexing operation on a seed input of length shorter than 32 bytes.

Impact Applications encapsulating with an attacker controlled seed value could be made to panic. Since the encapsulation seed should be considered a secret of the encapsulating party for the KEM to remain secure, an application should never take the seed value from a potentially attacker controlled source.

Mitigation With release of version `0.0.10` of `libcrux-kem` this bug has been fixed and the serialization functions return `InvalidPrivateKey` and `InvalidPublicKey` errors on invalid input buffer lengths. We recommend users upgrade to `libcrux-kem` version `0.0.10`.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  2. Revision 1 · created ·

    Published from osv record RUSTSEC-2026-0330

Agent brief

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# Patch Next advisory brief: rustsec-2026-0330

Advisory: Hybrid Encapsulation from Seed Panics on Short Seed
IDs: rustsec-2026-0330
Record: https://patchnext.com/advisories/rustsec-2026-0330 (revision 2, source checked 25 Oct 2026, 04:53 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: libcrux-kem 0.0.10. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io libcrux-kem: affected >= 0.0.0-0, < 0.0.10; fixed in 0.0.10

## Suggested inspection (read-only)
- crates.io libcrux-kem: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on libcrux-kem.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/RUSTSEC-2026-0330 (OSV record RUSTSEC-2026-0330 lists affected ranges: crates.io libcrux-kem >=0.0.0-0 <0.0.10 (fixed))

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