Path Traversal in Orhun Rustypaste
CVE-2026-90774
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.014 (71.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.014 · change: +0.008
Affected products
Weakness classification (CWE)
References
- github.com/orhun/rustypaste/issues/622 (issue-tracking)
- github.com/orhun/rustypaste (product)
- github.com/orhun/rustypaste/blob/v0.18.0/src/paste.rs (technical-description)
- github.com/orhun/rustypaste/commit/ac05d552596af4a8429d80f30d11f67117ce02c8 (patch)
- www.vulncheck.com/advisories/rustypaste-before-0.18.1-path-traversal-via-filena… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-90774?
- CVE-2026-90774 is a high-severity vulnerability in Orhun Rustypaste, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-09-13.
- How severe is CVE-2026-90774?
- High severity. CVSS v3 base score is 7.5 out of 10.