{"id":"GHSA-65p9-r9h6-22vj","summary":"AWS-LC has Timing Side-Channel in AES-CCM Tag Verification","details":"### Summary\nAWS-LC is an open-source, general-purpose cryptographic library.\n\n### Impact\nObservable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis.\n\nThe impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm.\n\nCustomers of AWS services do not need to take action. aws-lc-sys and aws-lc-fips-sys contain code from AWS-LC. Applications using aws-lc-sys or aws-lc-fips-sys should upgrade to the most recent releases of aws-lc-sys or aws-lc-fips-sys.\n\n### Impacted versions: \n - aws-lc-sys versions: \u003e= 0.14.0, \u003c 0.38.0\n - aws-lc-fips-sys versions: \u003e= v0.13.0, \u003c 0.13.12.\n\n### Patches\nThe patch is included in aws-lc-sys v.0.38.0 and aws-lc-fips-sys v0.13.12.\n\n### Workarounds\nIn the special cases of using AES-CCM with (M=4, L=2), (M=8, L=2), or (M=16, L=2), applications can workaround this issue by using AES-CCM through the EVP AEAD API using implementations EVP_aead_aes_128_ccm_bluetooth, EVP_aead_aes_128_ccm_bluetooth_8, and, EVP_aead_aes_128_ccm_matter respectively.\n\nOtherwise, there is no workaround and applications using aws-lc-sys or aws-lc-fips-sys should upgrade to the most recent releases of aws-lc-sys or aws-lc-fips-sys.\n\n### Resources\nIf there are any questions or comments about this advisory, contact [AWS/Amazon] Security via the[vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.\n\n### Acknowledgement\nAWS-LC would like to thank Joshua Rogers (https://joshua.hu/) for collaborating on this issue through the coordinated vulnerability disclosure process.","aliases":["CVE-2026-3337","GHSA-frmv-5gcm-jwxh","RUSTSEC-2026-0043","RUSTSEC-2026-0045"],"modified":"2026-09-10T03:50:37.687975213Z","published":"2026-03-03T20:09:25Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-03-03T20:09:25Z","nvd_published_at":null,"cwe_ids":["CWE-208"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/aws/aws-lc-rs/security/advisories/GHSA-65p9-r9h6-22vj"},{"type":"WEB","url":"https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3337"},{"type":"WEB","url":"https://aws.amazon.com/security/security-bulletins/2026-005-AWS"},{"type":"PACKAGE","url":"https://github.com/aws/aws-lc-rs"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2026-0043.html"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2026-0045.html"}],"affected":[{"package":{"name":"aws-lc-sys","ecosystem":"crates.io","purl":"pkg:cargo/aws-lc-sys"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.14.0"},{"fixed":"0.38.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-65p9-r9h6-22vj/GHSA-65p9-r9h6-22vj.json"}},{"package":{"name":"aws-lc-fips-sys","ecosystem":"crates.io","purl":"pkg:cargo/aws-lc-fips-sys"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.13.0"},{"fixed":"0.13.12"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-65p9-r9h6-22vj/GHSA-65p9-r9h6-22vj.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"}]}