How severe is CVE-2019-15608?

CVE-2019-15608 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2019-15608 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-15608?

CVE-2019-15608 affects Yarnpkg Yarn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-15608?

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

When was CVE-2019-15608 published?

CVE-2019-15608 was published on 2020-03-15 and last updated on 2026-06-17.

CVE-2019-15608

CVE-2019-15608 is a medium-severity vulnerability in Yarnpkg Yarn with a CVSS 3.x base score of 5.9. 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-367.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-367
Affected product: Yarnpkg Yarn
Published: 2020-03-15
Last modified: 2026-06-17

Description

The package integrity validation in yarn < 1.19.0 contains a TOCTOU vulnerability where the hash is computed before writing a package to cache. It's not computed again when reading from the cache. This may lead to a cache pollution attack.

Frequently asked questions

What is CVE-2019-15608?: The package integrity validation in yarn < 1.19.0 contains a TOCTOU vulnerability where the hash is computed before writing a package to cache. It's not computed again when reading from the cache. This may lead to a cache pollution attack.
How severe is CVE-2019-15608?: CVE-2019-15608 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2019-15608 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-15608?: CVE-2019-15608 affects Yarnpkg Yarn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-15608?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-15608 published?: CVE-2019-15608 was published on 2020-03-15 and last updated on 2026-06-17.

References

Affected products (1)

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

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