How severe is CVE-2025-9308?

CVE-2025-9308 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-9308 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-9308?

CVE-2025-9308 affects Yarnpkg Yarn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-9308?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-9308 have an EU (EUVD) identifier?

Yes. CVE-2025-9308 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25475.

When was CVE-2025-9308 published?

CVE-2025-9308 was published on 2025-08-21 and last updated on 2026-06-17.

CVE-2025-9308

CVE-2025-9308 is a low-severity vulnerability in Yarnpkg Yarn with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1333.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
CVSS v2: 1.7
CVSS v4: 4.8
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25475
Weakness: CWE-1333
Affected product: Yarnpkg Yarn
Published: 2025-08-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-9308?: 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.
How severe is CVE-2025-9308?: CVE-2025-9308 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-9308 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-9308?: CVE-2025-9308 affects Yarnpkg Yarn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-9308?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-9308 have an EU (EUVD) identifier?: Yes. CVE-2025-9308 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25475.
When was CVE-2025-9308 published?: CVE-2025-9308 was published on 2025-08-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yarnpkg:yarn:*:*:*:*:*:*:*:*

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