CVE-2026-28807 (GCVE-0-2026-28807)
Vulnerability from cvelistv5 – Published: 2026-03-10 21:34 – Updated: 2026-04-06 16:44
VLAI
EPSS
VEX
Title
Path Traversal in wisp.serve_static allows arbitrary file read
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-11 14:20 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
EEF
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/gleam-wisp/wisp/security/advis… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-28807.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-28807 | related |
| https://github.com/gleam-wisp/wisp/commit/161118c… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| gleam-wisp | wisp |
Affected:
2.1.1 , < 2.2.1
(semver)
cpe:2.3:a:gleam-wisp:wisp:*:*:*:*:*:*:*:* |
|
| gleam-wisp | wisp |
Affected:
129dcb1fe10ab1e676145d91477535e1c90ab550 , < 161118c431047f7ef1ff7cabfcc38981877fdd93
(git)
cpe:2.3:a:gleam-wisp:wisp:*:*:*:*:*:*:*:* |
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