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Vulnerability record · CVE-2026-90774 · published 13 September 2026

CVE-2026-90774: Path traversal vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.56% · top 55.7% CWE-22 · Path traversal Deferred
8.7CVSS 4.0 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
23 Sep 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-90774), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.