Which versions of Yarn are affected by CVE-2025-9308?

Organizations using yarnpkg Yarn should be aware of moderate risk from CVE-2025-9308, a resource exhaustion vulnerability rated CVSS 4.8. Service availability could be impacted.

Is there a public PoC exploit available for CVE-2025-9308?

Yes, a public proof-of-concept exploit is available for CVE-2025-9308. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-9308?

During next maintenance window: Identify affected systems running yarnpkg Yarn and apply vendor patches when convenient. Monitor vendor channels for patch availability.

Yarn CVE-2025-9308

Q: What is the CVSS score of CVE-2025-9308?

CVE-2025-9308 has a CVSS 4.0 base score of 4.8 (Medium). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

MEDIUM

Uncontrolled Resource Consumption (CWE-400)

2025-08-21 cna@vuldb.com

Denial Of Service Yarn Red Hat Suse

4.8

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

4.8 MEDIUM

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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:X/V:X/RE:X/U:X

SUSE

1.7 LOW

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

Red Hat

3.3 LOW

qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:08 vuln.today

PoC Detected

Sep 12, 2025 - 12:58 vuln.today

Public exploit code

CVE Published

Aug 21, 2025 - 16:15 nvd

MEDIUM 4.8

DescriptionCVE.org

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.

AnalysisAI

A vulnerability has been found in yarnpkg Yarn up to 1.22.22. Rated medium severity (CVSS 4.8), this vulnerability is low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. 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. Affected products include: Yarnpkg Yarn. Version information: up to 1.22.22..

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.