RUSTSEC-2026-0211

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Source

https://rustsec.org/advisories/RUSTSEC-2026-0211

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0211.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0211

Published

2026-07-14T12:00:00Z

Modified

2026-07-17T11:45:03.695400116Z

Severity

6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Non-constant time Authentication Tag Check in AES-GCM Decryption

Details

AES-GCM decryption used an implementation for checking the provided authentication tag against the recomputed authentication tag that was intended to be constant-time, but resulted in non-constant-time code generation in certain circumstances. Note that libcrux-aesgcm does not give guarantees on constant-time code generation and possible mitigations must be considered on a best-effort basis.

Impact

Users of libcrux-aesgcm that expose a decryption oracle to an attacker, which allows repeatedly querying for the same ciphertext were at risk from timing side-channel attacks, depending on their compilation environment. In the worst case, this could lead to recovery of the recomputed authentication tag by the attacker, which enables ciphertext forgery.

Mitigation

Starting from version 0.0.9 (published as libcrux-aes@v0.0.9), AES-GCM decryption uses a different, best-effort constant-time implementation of the tag check, which has been checked to reliably lead to constant time code generation, at the moment.

Database specific

{
    "license": "CC0-1.0"
}

References

Affected packages

crates.io / libcrux-aesgcm

Package

Name: libcrux-aesgcm; View open source insights on deps.dev
Purl: pkg:cargo/libcrux-aesgcm

Affected ranges

Type: SEMVER
Events: Introduced

0.0.0-0

Ecosystem specific

{
    "affected_functions": null,
    "affects": {
        "functions": [
            "libcrux_aesgcm::AesGcm128Key::decrypt",
            "libcrux_aesgcm::AesGcm256Key::decrypt",
            "libcrux_aesgcm::aes_gcm_128::AesGcm128::decrypt",
            "libcrux_aesgcm::aes_gcm_128::Key::decrypt",
            "libcrux_aesgcm::aes_gcm_128::KeyRef::decrypt",
            "libcrux_aesgcm::aes_gcm_128::neon::Key::decrypt",
            "libcrux_aesgcm::aes_gcm_128::neon::KeyRef::decrypt",
            "libcrux_aesgcm::aes_gcm_128::neon::NeonAesGcm128::decrypt",
            "libcrux_aesgcm::aes_gcm_128::portable::Key::decrypt",
            "libcrux_aesgcm::aes_gcm_128::portable::KeyRef::decrypt",
            "libcrux_aesgcm::aes_gcm_128::portable::PortableAesGcm128::decrypt",
            "libcrux_aesgcm::aes_gcm_128::x64::Key::decrypt",
            "libcrux_aesgcm::aes_gcm_128::x64::KeyRef::decrypt",
            "libcrux_aesgcm::aes_gcm_128::x64::X64AesGcm128::decrypt",
            "libcrux_aesgcm::aes_gcm_256::AesGcm256::decrypt",
            "libcrux_aesgcm::aes_gcm_256::Key::decrypt",
            "libcrux_aesgcm::aes_gcm_256::KeyRef::decrypt",
            "libcrux_aesgcm::aes_gcm_256::neon::Key::decrypt",
            "libcrux_aesgcm::aes_gcm_256::neon::KeyRef::decrypt",
            "libcrux_aesgcm::aes_gcm_256::neon::NeonAesGcm256::decrypt",
            "libcrux_aesgcm::aes_gcm_256::portable::Key::decrypt",
            "libcrux_aesgcm::aes_gcm_256::portable::KeyRef::decrypt",
            "libcrux_aesgcm::aes_gcm_256::portable::PortableAesGcm256::decrypt",
            "libcrux_aesgcm::aes_gcm_256::x64::Key::decrypt",
            "libcrux_aesgcm::aes_gcm_256::x64::KeyRef::decrypt",
            "libcrux_aesgcm::aes_gcm_256::x64::X64AesGcm256::decrypt"
        ],
        "os": [],
        "arch": []
    }
}

Database specific

informational

null