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CVE-2026-40912

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches the regex against the decoded URL path but uses the resulting byte length to slice the percent-encoded raw path. When a dot (or multiple dots) appears in the prefix portion of the URL, the raw path after
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:cc9e25fd93e4e6b081d31231cadda122a127f8d71a3b1bbabffa9cebcd571492
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
3

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:openshift_devspaces:3.28::el9"],"defaultStatus":"affected","packageName":"devspaces/traefik-rhel9","product":"Red Hat OpenShift Dev Spaces 3.28","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1779786779","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/affected/0

{"product":"traefik","vendor":"traefik","versions":[{"status":"affected","version":"< 2.11.43"},{"status":"affected","version":">= 3.0.0-beta1, < 3.6.14"},{"status":"affected","version":">= 3.7.0-ea.1, < 3.7.0-rc.2"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/affected/0
cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.8,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/metrics/1/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-706","description":"CWE-706: Use of Incorrectly-Resolved Name or Reference","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-22","description":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/problemTypes/0/descriptions/0

Affected products and versions

2 source assertions
{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:openshift_devspaces:3.28::el9"],"defaultStatus":"affected","packageName":"devspaces/traefik-rhel9","product":"Red Hat OpenShift Dev Spaces 3.28","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1779786779","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/affected/0
{"product":"traefik","vendor":"traefik","versions":[{"status":"affected","version":"< 2.11.43"},{"status":"affected","version":">= 3.0.0-beta1, < 3.6.14"},{"status":"affected","version":">= 3.7.0-ea.1, < 3.7.0-rc.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.8,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/metrics/1/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-706","description":"CWE-706: Use of Incorrectly-Resolved Name or Reference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-22","description":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/problemTypes/0/descriptions/0

Source references

8 source assertions
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:21772"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-40912"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/references/0
{"name":"RHBZ#2464229","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2464229"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/references/1
{"name":"https://github.com/traefik/traefik/releases/tag/v2.11.43","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v2.11.43"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/references/1
{"name":"https://github.com/traefik/traefik/releases/tag/v3.6.14","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v3.6.14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/references/2
{"name":"https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/references/3
{"name":"https://github.com/traefik/traefik/security/advisories/GHSA-6jwx-7vp4-9847","tags":["x_refsource_CONFIRM"],"url":"https://github.com/traefik/traefik/security/advisories/GHSA-6jwx-7vp4-9847"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40912.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:da00504ab83f72d54b487cd59d940c8256e416fa008d3a86124fe30b597b5554 · sha256:ecdc10f9603a5b65… · /containers/adp/1/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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