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CVE-2026-45721

Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, when Algernon is asked for any URL path that resolves to a directory without an index file, DirPage walks upward through parent directories — past the configured server root — looking for a file named handler.lua to execute as the request handler. The loop terminates only after 100 ancestor steps or when filepath.Dir returns ., so on any absolute server-root path the search reaches the filesystem root (/ on Unix, drive lette
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1868374208bb3cf6cd97cc0ab2e03e1aeb8792a606549adb6b71dfe6d52e11a3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-552","description":"CWE-552: Files or Directories Accessible to External Parties","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-426","description":"CWE-426: Untrusted Search Path","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"algernon","vendor":"xyproto","versions":[{"status":"affected","version":"< 1.17.7"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-552","description":"CWE-552: Files or Directories Accessible to External Parties","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-426","description":"CWE-426: Untrusted Search Path","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/xyproto/algernon/security/advisories/GHSA-xwcr-wm99-g9jc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/xyproto/algernon/security/advisories/GHSA-xwcr-wm99-g9jc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/xyproto/algernon/security/advisories/GHSA-xwcr-wm99-g9jc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3cb091cdd0a39c66329fb3886d0f3c1e39e117abf98d438fdb2c90537dd129c · sha256:760dd47a0333b74e… · /containers/adp/0/references/0

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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