{"schemaVersion":3,"id":"CVE-2026-93602","aliases":["UBUNTU-CVE-2026-93602","DEBIAN-CVE-2026-93602","GHSA-pwjx-qhcg-rvj4","RUSTSEC-2026-0049"],"status":"published","duplicateOf":null,"title":null,"description":"rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 contain faulty CRL authority-matching logic that compares only the first distributionPoint against each CRL's IssuingDistributionPoint, ignoring additional distributionPoints. Attackers with a compromised trusted issuing authority can present revoked certificates that pass revocation checks under UnknownStatusPolicy::Allow, or cause incorrect errors under the default deny policy.","dates":{"published":"2026-09-18T13:20:12.259Z","modified":"2026-09-18T17:58:12.511Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.9,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":5.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":5.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":4.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N","exploitability":1.8,"impact":6,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":5.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/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","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Crates.io","score":4.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N","exploitability":1.8,"impact":6,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":5.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.002,"percentile":0.09351,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.002},"history":[{"date":"2026-09-19T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.002,"percentile":0.09351}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00209,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.002,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.002,"percentile":0.09351}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-299","name":"Improper Check for Certificate Revocation","description":"The product does not check or incorrectly checks the revocation status of a certificate, which may cause it to use a certificate that has been compromised.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/299.html"}],"affected":[{"vendor":"Crates.Io","product":"rustls-webpki","name":"rustls-webpki","label":"rustls-webpki","ecosystem":"Crates.Io","cpePart":null,"purl":"pkg:cargo/rustls-webpki","purlType":"cargo","versions":[{"text":"≥ 0.104.0-alpha.1, < 0.104.0-alpha.5","noFixRecorded":false,"fixedIn":null},{"text":"≥ 0.102.0-alpha.0, < 0.103.10","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 0.104.0-alpha.1, < 0.104.0-alpha.5 | ≥ 0.102.0-alpha.0, < 0.103.10","eol":null,"hubHref":null},{"vendor":"debian","product":"rust-rustls-webpki","name":"rust-rustls-webpki","label":"rust-rustls-webpki","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/rust-rustls-webpki","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 0.103.10+ds-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 0.103.10+ds-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"rust-rustls-webpki","name":"rust-rustls-webpki","label":"rust-rustls-webpki","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/rust-rustls-webpki","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"rustls","product":"webpki","name":"webpki","label":"webpki","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 0.102.0-alpha.0, < 0.103.10","noFixRecorded":false,"fixedIn":null},{"text":"≥ 0.104.0-alpha.1, < 0.104.0-alpha.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 0.102.0-alpha.0, < 0.103.10 | ≥ 0.104.0-alpha.1, < 0.104.0-alpha.5","eol":null,"hubHref":"/vendor/rustls/webpki"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/rustls/webpki/security/advisories/GHSA-pwjx-qhcg-rvj4","label":"github.com/rustls/webpki/security/advisories/GHSA-pwjx-qhcg-rvj4","hostname":"github.com","tags":["Vendor Advisory","REPORT","WEB"]},{"url":"https://www.vulncheck.com/advisories/rustls-webpki-before-0.103.10-crl-revocation-check-bypass","label":"www.vulncheck.com/advisories/rustls-webpki-before-0.103.10-crl-revocation-check-bypass","hostname":"www.vulncheck.com","tags":["Third Party Advisory","REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-93602","label":"ubuntu.com/security/CVE-2026-93602","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93602","label":"www.cve.org/CVERecord?id=CVE-2026-93602","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0049.html","label":"rustsec.org/advisories/RUSTSEC-2026-0049.html","hostname":"rustsec.org","tags":["REPORT","WEB","Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-93602","label":"security-tracker.debian.org/tracker/CVE-2026-93602","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://github.com/rustls/webpki","label":"github.com/rustls/webpki","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://crates.io/crates/rustls-webpki","label":"crates.io/crates/rustls-webpki","hostname":"crates.io","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-RU-2026:22132-1","OPENSUSE-SU-2026:11936-1","OPENSUSE-SU-2026:21982-1","OPENSUSE-SU-2026:22016-1","SUSE-SU-2026:23983-1","SUSE-SU-2026:24014-1"],"duplicates":[],"related":["OPENSUSE-RU-2026:22132-1","OPENSUSE-SU-2026:11936-1","OPENSUSE-SU-2026:21982-1","OPENSUSE-SU-2026:22016-1","SUSE-SU-2026:23983-1","SUSE-SU-2026:24014-1"]},"timeline":[{"kind":"published","date":"2026-09-18T13:20:12.259Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-18T17:58:12.511Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":24,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T03:02:54.433Z","stale":false,"partial":false}}