CVE-2026-90774: Path Traversal (CVSS 7.5)

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS — Exploit Prediction

0.0038

Probability of exploitation

0.32%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

References

Other 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

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-90774? +

CVE-2026-90774 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0038, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-90774? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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