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CVE-2026-90774

7.5 · HIGH

rustypaste before 0.18.1 validates the destination path before applying the optional custom filename HTTP header, allowing attackers to bypass directory-escape checks.

Published Sep 13, 2026CWE-22EPSS 1.36%

Overview

CVE-2026-90774 is a high-severity vulnerability. It was published on September 13, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/orhun/rustypasteGitHubgithub.com/orhun/rustypaste/blob/v0.18.0/src/paste.rsGitHubgithub.com/orhun/rustypaste/commit/ac05d552596af4a8429d80f30d11f67117ce02c8GitHubgithub.com/orhun/rustypaste/issues/622Refwww.vulncheck.com/advisories/rustypaste-before-0.18.1-path-traversal-via-filename-headerGitHubgithub.com/orhun/rustypaste/issues/622

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90774?

CVE-2026-90774 is a high-severity vulnerability. It was published on September 13, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-90774?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-90774?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-90774?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90774 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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