CVE-2025-9308 yarnpkg Yarn request-manager.js setOptions redos

What is CVE-2025-9308?

CVE-2025-9308 is a medium-severity denial of service vulnerability in yarnpkg Yarn, published on 21 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability has been found in yarnpkg Yarn up to 1.22.22. This impacts the function setOptions of the file src/util/request-manager.js. Such manipulation leads to inefficient regular expression complexity. Local access is required to approach this attack. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-400, CWE-1333

Which versions are affected by CVE-2025-9308?

It affects 1 product.

Products include Yarnpkg Yarn.

How do I fix CVE-2025-9308?

Product is end of life, replace it.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-9308 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9308 exists.

Other vulnerabilities in yarnpkg Yarn

• CVE-2019-5448 Missing Encryption of Sensitive Data in yarn High 8.1
• CVE-2019-10773 Yarn Improper link resolution before file access (Link Following) High 7.8
• CVE-2021-4435 Yarn: untrusted search path High 7.7
• CVE-2020-8131 Path Traversal in Yarn High 7.5
• CVE-2019-15608 TOCTOU Race Condition in Yarn Medium 5.9

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2025-9308, GHSA-pfv3-xh9q-f4rq, MINI-x9wf-vrp9-qqff, UBUNTU-CVE-2025-9308.