{"id":"RUSTSEC-2026-0209","aliases":[],"status":"published","title":"AES-GCM did not enforce limits on AAD length","description":"NIST Special Publication 800-38D specifies that the bit length of the\nAAD shall not exceed `2^64 - 1` bits. The implementation of AES-GCM in\n`libcrux-aesgcm` neither enforced this limit for encryption nor for\ndecryption.\n\n## Impact\nUse of AES-GCM with AAD of length exceeding the prescribed maximum\nlength degrades the authentication security of the GCM tag.\n\n## Mitigation\nStarting from version `0.0.9` (published as `libcrux-aes@v0.0.9`),\nlimits on the length of the AAD input are enforced, so overlong AAD\ninputs result in an error on encryption and decryption.","severity":{"version":"4.0","score":6.3,"vector":"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","level":"medium","from":"osv"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2026-06-09T12:00:00Z","modified":"2026-07-17T11:45:03Z","affected":[{"source":"osv","ecosystem":"crates.io","package":"libcrux-aesgcm","ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.0-0"}]}]}],"references":[{"url":"https://crates.io/crates/libcrux-aesgcm","tags":["package"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0209.html","tags":["advisory"]},{"url":"https://github.com/celabshq/libcrux/pull/1474","tags":["web"]}],"sources":{"osv":[{"id":"RUSTSEC-2026-0209","title":"AES-GCM did not enforce limits on AAD length","description":"NIST Special Publication 800-38D specifies that the bit length of the\nAAD shall not exceed `2^64 - 1` bits. The implementation of AES-GCM in\n`libcrux-aesgcm` neither enforced this limit for encryption nor for\ndecryption.\n\n## Impact\nUse of AES-GCM with AAD of length exceeding the prescribed maximum\nlength degrades the authentication security of the GCM tag.\n\n## Mitigation\nStarting from version `0.0.9` (published as `libcrux-aes@v0.0.9`),\nlimits on the length of the AAD input are enforced, so overlong AAD\ninputs result in an error on encryption and decryption.","status":"published","published":"2026-06-09T12:00:00Z","modified":"2026-07-17T11:45:03.763624492Z","cvss":[{"version":"4.0","score":6.3,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T15:53:40.430679Z"}]}}