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HIGH

CVE-2026-90774

rustypaste before 0.18.1 Path Traversal via filename header

CVSS v3

7.5

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

Published
2026-09-13
Last Modified
2026-09-13

Frequently asked questions

What is 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.

Is CVE-2026-90774 actively exploited?

Active exploitation of CVE-2026-90774 has not been confirmed. Its EPSS score was 0.6% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-90774?

CVE-2026-90774 has a CVSS v3 base score of 7.5 (HIGH severity).

Is CVE-2026-90774 affecting your environment?

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