{"id":"CVE-2026-3337","aliases":["GHSA-65p9-r9h6-22vj","GHSA-frmv-5gcm-jwxh","RUSTSEC-2026-0043","RUSTSEC-2026-0045"],"url":"https://o3.security/vulnerability/CVE-2026-3337","summary":"Timing Side-Channel in AES-CCM Tag Verification in AWS-LC","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: >= 0.14.0, < 0.38.0\n - aws-lc-fips-sys versions: >= v0.13.0, < 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.","published":"2026-03-02T21:20:08.532Z","modified":"2026-10-28T11:11:52.095477207Z","cvss":null,"epss":{"score":0.01079,"percentile":0.62501,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"aws-lc-sys","fixedVersion":"0.38.0"},{"ecosystem":"crates.io","name":"aws-lc-fips-sys","fixedVersion":"0.13.12"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://aws.amazon.com/security/security-bulletins/2026-005-AWS/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3337.json"},{"type":"ADVISORY","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":"FIX","url":"https://github.com/aws/aws-lc/releases/tag/v1.69.0"},{"type":"WEB","url":"https://github.com/aws/aws-lc-rs/security/advisories/GHSA-65p9-r9h6-22vj"},{"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T11:11:52.095477207Z"}}