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CVE-2026-40611

Let's Encrypt client and ACME library written in Go (Lego). Prior to 4.34.0, the webroot HTTP-01 challenge provider in lego is vulnerable to arbitrary file write and deletion via path traversal. A malicious ACME server can supply a crafted challenge token containing ../ sequences, causing lego to write attacker-influenced content to any path writable by the lego process. This vulnerability is fixed in 4.34.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d5e35fb9c52d6e2ce5c580ce7beab889eb55951b0f18dbe3e4d7fb988a9be4b5
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"lego","vendor":"go-acme","versions":[{"status":"affected","version":"< 4.34.0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/cna/affected/0

{"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:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/adp/1/affected/0
cwe · 2 assertions

{"cweId":"CWE-22","description":"CWE-22: 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:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /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:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/adp/1/problemTypes/0/descriptions/0

Affected products and versions

2 source assertions
{"product":"lego","vendor":"go-acme","versions":[{"status":"affected","version":"< 4.34.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/cna/affected/0
{"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:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/adp/1/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/cna/metrics/0/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/adp/1/metrics/1/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-22","description":"CWE-22: 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:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /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:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/adp/1/problemTypes/0/descriptions/0

Source references

6 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:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/adp/1/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-40611"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/adp/1/references/0
{"name":"RHBZ#2460233","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460233"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/adp/1/references/1
{"tags":["exploit"],"url":"https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/adp/0/references/0
{"name":"https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40611.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aacbfa0639257f5ec596660a58ce4ec19993e06d49282a6b49ff0d0f6b8e9e2d · sha256:a0ab5404cdbcbd1b… · /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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