CVE-2026-28807
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
Summary
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.
The 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.
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.
This issue affects wisp: from 2.1.1 before 2.2.1.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| gleam-wisp | wisp | 2.1.1 < 2.2.1 | affected |
| gleam-wisp | wisp | 129dcb1fe10ab1e676145d91477535e1c90ab550 < 161118c431047f7ef1ff7cabfcc38981877fdd93 | affected |
Weaknesses
- CWE-22: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
- https://github.com/gleam-wisp/wisp/security/advisories/GHSA-h7cj-j2vv-qw8r
- https://cna.erlef.org/cves/CVE-2026-28807.html
- https://osv.dev/vulnerability/EEF-CVE-2026-28807
- https://github.com/gleam-wisp/wisp/commit/161118c431047f7ef1ff7cabfcc38981877fdd93
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