{"id":"CVE-2026-4428","aliases":["EUVD-2026-13237","GHSA-9f94-5g5w-gf6r","RUSTSEC-2026-0042","RUSTSEC-2026-0048"],"status":"published","title":"CRL Distribution Point Scope Check Logic Error in AWS-LC","description":"A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows  a revoked certificate to bypass certificate revocation checks.\n\nTo remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.","severity":{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00257,"percentile":0.17428,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-295","CWE-299"],"published":"2026-03-19T12:00:00Z","modified":"2026-11-09T11:00:04Z","fixes":[{"ecosystem":"crates.io","package":"aws-lc-fips-sys","fixed_in":["0.13.13"],"sources":["ghsa","osv"]},{"ecosystem":"crates.io","package":"aws-lc-sys","fixed_in":["0.39.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"crates.io","package":"aws-lc-fips-sys","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.13.0"},{"fixed":"0.13.13"}]}]},{"source":"ghsa","ecosystem":"crates.io","package":"aws-lc-sys","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.15.0"},{"fixed":"0.39.0"}]}]},{"source":"osv","ecosystem":"crates.io","package":"aws-lc-fips-sys","ranges":[{"type":"SEMVER","events":[{"introduced":"0.13.0"},{"fixed":"0.13.13"}]}]},{"source":"osv","ecosystem":"crates.io","package":"aws-lc-sys","ranges":[{"type":"SEMVER","events":[{"introduced":"0.15.0"},{"fixed":"0.39.0"}]}]},{"source":"osv","ecosystem":"crates.io","package":"aws-lc-fips-sys","ranges":[{"type":"SEMVER","events":[{"introduced":"0.13.0"},{"fixed":"0.13.13"}]}]},{"source":"osv","ecosystem":"crates.io","package":"aws-lc-sys","ranges":[{"type":"SEMVER","events":[{"introduced":"0.15.0"},{"fixed":"0.39.0"}]}]}],"products":[{"vendor":"aws","product":"aws-lc"},{"vendor":"aws","product":"aws-lc-fips"}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-010-AWS/","tags":["vendor-advisory","advisory"]},{"url":"https://github.com/aws/aws-lc/releases/tag/v1.71.0","tags":["patch","fix"]},{"url":"https://github.com/aws/aws-lc-rs/security/advisories/GHSA-9f94-5g5w-gf6r","tags":["web"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-010-AWS","tags":["web"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0042.html","tags":["web","advisory"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0048.html","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-9f94-5g5w-gf6r"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4428.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4428","tags":["advisory"]},{"url":"https://github.com/aws/aws-lc-rs","tags":["package"]},{"url":"https://crates.io/crates/aws-lc-fips-sys","tags":["package"]},{"url":"https://crates.io/crates/aws-lc-sys","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-4428","title":"CRL Distribution Point Scope Check Logic Error in AWS-LC","description":"A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows  a revoked certificate to bypass certificate revocation checks.\n\nTo remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.","status":"published","published":"2026-03-19T20:37:53.851Z","modified":"2026-03-25T14:13:42.572Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-299"],"updated_at":"2026-11-02T14:19:59.369956Z"}],"euvd":[{"id":"EUVD-2026-13237","description":"A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows  a revoked certificate to bypass certificate revocation checks.\n\nTo remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.","status":"published","published":"2026-03-19T20:37:53Z","modified":"2026-03-25T14:13:42Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-02T19:25:29.129467Z"}],"ghsa":[{"id":"GHSA-9f94-5g5w-gf6r","title":"CRL Distribution Point Scope Check Logic Error in AWS-LC","description":"### Summary\n\nAWS-LC is an open-source, general-purpose cryptographic library.\n\n### Impact \n\nA logic error in CRL distribution point matching in AWS-LC allows a revoked certificate to bypass revocation checks during certificate validation, when the application enables CRL checking and uses partitioned CRLs with Issuing Distribution Point (IDP) extensions.\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 \u003e= v0.15.0, \u003c v0.39.0\n* aws-lc-fips-sys \u003e= v0.13.0, \u003c v0.13.13\n\n### Patches \n\nThe patch is included in aws-lc-sys v0.39.0 and aws-lc-fips-sys v0.13.13.\n\n### Workarounds\n\nApplications can workaround this issue if they do not enable CRL checking (X509_V_FLAG_CRL_CHECK). Applications using complete (non-partitioned) CRLs without IDP extensions are also not affected.\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### References\n\nIf you have any questions or comments about this advisory, we ask that you contact AWS Security via our [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.","status":"published","published":"2026-03-20T20:35:14Z","modified":"2026-03-20T20:35:33Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:39:39.567266Z"}],"nvd":[{"id":"CVE-2026-4428","description":"A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows  a revoked certificate to bypass certificate revocation checks.\n\nTo remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.","status":"published","published":"2026-03-19T21:17:14.17Z","modified":"2026-06-17T10:56:33.39Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-299"],"updated_at":"2026-11-02T14:12:09.735529Z"}],"osv":[{"id":"CVE-2026-4428","title":"CRL Distribution Point Scope Check Logic Error in AWS-LC","description":"A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows  a revoked certificate to bypass certificate revocation checks.\n\nTo remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.","status":"published","published":"2026-03-19T20:37:53.851Z","modified":"2026-10-28T11:10:53.496861895Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-299"],"updated_at":"2026-11-02T15:45:04.820169Z"},{"id":"GHSA-9f94-5g5w-gf6r","title":"CRL Distribution Point Scope Check Logic Error in AWS-LC","description":"### Summary\n\nAWS-LC is an open-source, general-purpose cryptographic library.\n\n### Impact \n\nA logic error in CRL distribution point matching in AWS-LC allows a revoked certificate to bypass revocation checks during certificate validation, when the application enables CRL checking and uses partitioned CRLs with Issuing Distribution Point (IDP) extensions.\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 \u003e= v0.15.0, \u003c v0.39.0\n* aws-lc-fips-sys \u003e= v0.13.0, \u003c v0.13.13\n\n### Patches \n\nThe patch is included in aws-lc-sys v0.39.0 and aws-lc-fips-sys v0.13.13.\n\n### Workarounds\n\nApplications can workaround this issue if they do not enable CRL checking (X509_V_FLAG_CRL_CHECK). Applications using complete (non-partitioned) CRLs without IDP extensions are also not affected.\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### References\n\nIf you have any questions or comments about this advisory, we ask that you contact AWS Security via our [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.","status":"published","published":"2026-03-20T20:35:14Z","modified":"2026-09-10T03:50:38.508589596Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T15:46:43.524801Z"},{"id":"RUSTSEC-2026-0042","title":"CRL Distribution Point Scope Check Logic Error in AWS-LC","description":"A logic error in CRL distribution point matching in AWS-LC allows a revoked\ncertificate to bypass revocation checks during certificate validation, when\nthe application enables CRL checking and uses partitioned CRLs with Issuing\nDistribution Point (IDP) extensions.\n\nCustomers of AWS services do not need to take action. `aws-lc-fips-sys`\ncontains code from AWS-LC. Applications using `aws-lc-fips-sys` should\nupgrade to the most recent release of `aws-lc-fips-sys`.\n\n## Workarounds\n\nApplications can workaround this issue if they do not enable CRL checking\n(`X509_V_FLAG_CRL_CHECK`). Applications using complete (non-partitioned)\nCRLs without IDP extensions are also not affected.\n\nOtherwise, there is no workaround and applications using `aws-lc-fips-sys`\nshould upgrade to the most recent releases of `aws-lc-fips-sys`.","status":"published","published":"2026-03-19T12:00:00Z","modified":"2026-11-09T11:00:04.286751599Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-09T11:24:16.480676Z"},{"id":"RUSTSEC-2026-0048","title":"CRL Distribution Point Scope Check Logic Error in AWS-LC","description":"A logic error in CRL distribution point matching in AWS-LC allows a revoked\ncertificate to bypass revocation checks during certificate validation, when\nthe application enables CRL checking and uses partitioned CRLs with Issuing\nDistribution Point (IDP) extensions.\n\nCustomers of AWS services do not need to take action. `aws-lc-sys` contains\ncode from AWS-LC. Applications using `aws-lc-sys` should upgrade to the most\nrecent release of `aws-lc-sys`.\n\n## Workarounds\n\nApplications can workaround this issue if they do not enable CRL checking\n(`X509_V_FLAG_CRL_CHECK`). Applications using complete (non-partitioned)\nCRLs without IDP extensions are also not affected.\n\nOtherwise, there is no workaround and applications using `aws-lc-sys` should\nupgrade to the most recent releases of `aws-lc-sys`.","status":"published","published":"2026-03-19T12:00:00Z","modified":"2026-11-09T11:00:03.683792254Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-09T11:24:16.480676Z"}]}}