# RUSTSEC-2026-0209 - AES-GCM did not enforce limits on AAD length

Source: https://junglewise.ai/threats/rustsec-2026-0209-aes-gcm-did-not-enforce-limits-on-aad-length-d3652f11  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09  
License: CC BY 4.0 with a link back

Severity: medium · CVSS 4 · Published 2026-06-09

AES-GCM did not enforce limits on AAD length

Technologies: [libcrux-aesgcm (crates.io)](https://junglewise.ai/threats/technologies/libcrux-aesgcm). 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 9 June 2026.

**Which products and versions are affected?** libcrux-aesgcm (crates.io) SEMVER:introduced=0.0.0-0.

**Is there a fix for This vulnerability?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected?** Check whether you run libcrux-aesgcm (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.

## Affected products

- libcrux-aesgcm (crates.io) SEMVER:introduced=0.0.0-0

## Related threats

- [RUSTSEC-2026-0210 - `libcrux-aesgcm` Renamed to `libcrux-aes`](https://junglewise.ai/threats/rustsec-2026-0210-libcrux-aesgcm-renamed-to-libcrux-aes-17f96f30)
- [RUSTSEC-2026-0211 - Non-constant time Authentication Tag Check in AES-GCM Decryption](https://junglewise.ai/threats/rustsec-2026-0211-non-constant-time-authentication-tag-check-in-aes-gcm-c11cf12c)