What’s Vulnerable › Vulnerabilities

CVE-2026-90774: rustypaste before 0.18.1 Path Traversal via filename header

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-13 · updated 2026-09-23
• Weakness: CWE-22

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.

Affected products

• orhun rustypaste: before 0.18.1 — fixed in 0.18.1

How to fix

Upgrade to a fixed version: orhun rustypaste 0.18.1. Check the vendor advisory for mitigations.

References

• https://github.com/orhun/rustypaste
• https://github.com/orhun/rustypaste/blob/v0.18.0/src/paste.rs
• https://github.com/orhun/rustypaste/commit/ac05d552596af4a8429d80f30d11f67117ce02c8
• https://github.com/orhun/rustypaste/issues/622
• https://www.vulncheck.com/advisories/rustypaste-before-0.18.1-path-traversal-via-filename-header
• https://github.com/orhun/rustypaste/issues/622

Get alerted when CVE-2026-90774 or the next vulnerability affects your stack