{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-28807","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","state":"PUBLISHED","assignerShortName":"EEF","dateReserved":"2026-03-03T14:40:00.590Z","datePublished":"2026-03-10T21:34:47.859Z","dateUpdated":"2026-04-06T16:44:07.589Z"},"containers":{"cna":{"affected":[{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:gleam-wisp:wisp:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","packageName":"wisp","packageURL":"pkg:hex/wisp","product":"wisp","repo":"https://github.com/gleam-wisp/wisp","vendor":"gleam-wisp","versions":[{"lessThan":"2.2.1","status":"affected","version":"2.1.1","versionType":"semver"}]},{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:gleam-wisp:wisp:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","packageName":"gleam-wisp/wisp","packageURL":"pkg:github/gleam-wisp/wisp","product":"wisp","repo":"https://github.com/gleam-wisp/wisp.git","vendor":"gleam-wisp","versions":[{"lessThan":"161118c431047f7ef1ff7cabfcc38981877fdd93","status":"affected","version":"129dcb1fe10ab1e676145d91477535e1c90ab550","versionType":"git"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:gleam-wisp:wisp:*:*:*:*:*:*:*:*","versionEndExcluding":"2.2.1","versionStartIncluding":"2.1.1","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"AND"}],"credits":[{"lang":"en","type":"finder","value":"John Downey"},{"lang":"en","type":"remediation developer","value":"Louis Pilfold"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in gleam-wisp wisp allows arbitrary file read via percent-encoded path traversal.<p>The <tt>wisp.serve_static</tt> function is vulnerable to path traversal because sanitization runs before percent-decoding. The encoded sequence <tt>%2e%2e</tt> passes through <tt>string.replace</tt> unchanged, then <tt>uri.percent_decode</tt> converts it to <tt>..</tt>, which the OS resolves as directory traversal when the file is read.</p><p>An unauthenticated attacker can read any file readable by the application process in a single HTTP request, including application source code, configuration files, secrets, and system files.</p><p>This issue affects wisp: from 2.1.1 before 2.2.1.</p>"}],"value":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in gleam-wisp wisp allows arbitrary file read via percent-encoded path traversal.\n\nThe wisp.serve_static function is vulnerable to path traversal because sanitization runs before percent-decoding. The encoded sequence %2e%2e passes through string.replace unchanged, then uri.percent_decode converts it to .., which the OS resolves as directory traversal when the file is read.\n\nAn unauthenticated attacker can read any file readable by the application process in a single HTTP request, including application source code, configuration files, secrets, and system files.\n\nThis issue affects wisp: from 2.1.1 before 2.2.1."}],"impacts":[{"capecId":"CAPEC-139","descriptions":[{"lang":"en","value":"CAPEC-139 Relative Path Traversal"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","description":"CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","shortName":"EEF","dateUpdated":"2026-04-06T16:44:07.589Z"},"references":[{"tags":["vendor-advisory","related"],"url":"https://github.com/gleam-wisp/wisp/security/advisories/GHSA-h7cj-j2vv-qw8r"},{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-28807.html"},{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-28807"},{"tags":["patch"],"url":"https://github.com/gleam-wisp/wisp/commit/161118c431047f7ef1ff7cabfcc38981877fdd93"}],"source":{"discovery":"EXTERNAL"},"title":"Path Traversal in wisp.serve_static allows arbitrary file read","x_generator":{"engine":"Vulnogram 1.0.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-11T14:20:19.768057Z","id":"CVE-2026-28807","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-11T14:20:59.654Z"}}]}}