Vulnerability details
CVE-2026-90774
orhun rustypaste
rustypaste before 0.18.1 Path Traversal via filename header
CVSS 4.0
8.7High
Official description
rustypaste before 0.18.1 validates the destination path before applying the optional custom filename HTTP header, allowing attackers to bypass directory-escape checks. Attackers can supply path traversal sequences in the filename header to write files outside the configured upload directory to arbitrary locations.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| orhun | rustypaste | v < 0.18.1 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://github.com/orhun/rustypaste product
- https://github.com/orhun/rustypaste/blob/v0.18.0/src/paste.rs technical-description
- https://github.com/orhun/rustypaste/commit/ac05d552596af4a8429d80f30d11f67117ce02c8 patch
- https://www.vulncheck.com/advisories/rustypaste-before-0.18.1-path-traversal-via-filename-header third-party-advisory
- https://github.com/orhun/rustypaste/issues/622 issue-tracking
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Details
- Published
- 2026-09-13
- Last updated
- 2026-09-24
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
1.35%
Probability of exploitation in 30 days
71.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')