{"schemaVersion":3,"id":"CVE-2026-88010","aliases":["CGA-gh2v-7cq7-2425","CGA-hq6f-j3cw-8xpp","GHSA-8fcf-v89g-xpg6","GO-2026-6558"],"status":"published","duplicateOf":null,"title":null,"description":"Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.7.13, checkPassword in pkg/middlewares/auth/basic_auth.go constructs the BasicAuth singleflight key from the submitted password and stored secret. Concurrent requests for absent usernames therefore coalesce on one key while configured usernames perform separate password hashes, creating an unauthenticated timing discrepancy that reveals whether a username exists. Sequential checks remain cost-equalized, Traefik v2 and Digest authentication are not affected, and the issue does not disclose credentials or bypass authentication. This issue is fixed in version 3.7.13.","dates":{"published":"2026-09-22T15:38:25.969Z","modified":"2026-09-22T16:00:11.588Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.3,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Wolfi","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Go","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Chainguard","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/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}]},"epss":{"probability":0.00691,"percentile":0.5196,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-09-23T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00691,"percentile":0.5196}],"last30":[{"date":"2026-09-23T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00691,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00691,"percentile":0.5196}]},"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-208","name":"Observable Timing Discrepancy","description":"Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/208.html"}],"affected":[{"vendor":"chainguard","product":"traefik-3.6","name":"traefik-3.6","label":"traefik-3.6","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/traefik-3.6","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"wolfi","product":"traefik-3.6","name":"traefik-3.6","label":"traefik-3.6","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/traefik-3.6","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"github.com/traefik","product":"traefik","name":"github.com/traefik/traefik","label":"traefik","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/traefik/traefik","purlType":"golang","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"Go","product":"Traefik","name":"Traefik","label":"Traefik","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/Traefik","purlType":"golang","versions":[{"text":"≥ 3.6.11, < 3.7.13","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.6.11, < 3.7.13","eol":null,"hubHref":null},{"vendor":"traefik","product":"traefik","name":"traefik","label":"traefik","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.6.11, < 3.7.13","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.6.11, < 3.7.13","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"traefik","label":"Traefik","category":"server-app"}},"hubHref":"/vendor/traefik/traefik"}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-8fcf-v89g-xpg6","label":"github.com/traefik/traefik/security/advisories/GHSA-8fcf-v89g-xpg6","hostname":"github.com","tags":["X Refsource CONFIRM","Advisory","WEB"]},{"url":"https://github.com/traefik/traefik/pull/13816","label":"github.com/traefik/traefik/pull/13816","hostname":"github.com","tags":["X Refsource MISC","FIX","WEB"]},{"url":"https://github.com/traefik/traefik/commit/ddc1bf4660b85fd61fafdd821eb8216fb1a0b130","label":"github.com/traefik/traefik/commit/ddc1bf4660b85fd61fafdd821eb8216fb1a0b130","hostname":"github.com","tags":["X Refsource MISC","FIX","WEB"]},{"url":"https://github.com/traefik/traefik/releases/tag/v3.7.13","label":"github.com/traefik/traefik/releases/tag/v3.7.13","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88010.json","label":"github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88010.json","hostname":"github.com","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88010","label":"nvd.nist.gov/vuln/detail/CVE-2026-88010","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/traefik/traefik","label":"github.com/traefik/traefik","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:12076-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:12076-1"]},"timeline":[{"kind":"published","date":"2026-09-22T15:38:25.969Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-22T16:00:11.588Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":25,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T22:51:29.783Z","stale":false,"partial":false}}