What is CVE-2019-5448?

CVE-2019-5448 is a high-severity vulnerability in Yarn, classified under Missing Encryption of Sensitive Data. CVSS score: 8.1/10. Published 2019-07-30.

How severe is CVE-2019-5448?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Yarn

CVE-2019-5448

Yarn before 1.17.3 is vulnerable to Missing Encryption of Sensitive Data due to HTTP URLs in lockfile causing unencrypted authentication data to be sent over the network.

Published 2019-07-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.0th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Yarn — versions Fixed in 1.17.3
Yarnpkg Yarn

Weakness classification (CWE)

References

hackerone.com/reports/640904 (Permissions Required, Third Party Advisory)
github.com/ChALkeR/notes/blob/master/Yarn-vuln.md (Exploit, Third Party Advisory)
yarnpkg.com/blog/2019/07/12/recommended-security-update/ (Vendor Advisory)

Frequently asked questions

What is CVE-2019-5448?: CVE-2019-5448 is a high-severity vulnerability in Yarn, classified under Missing Encryption of Sensitive Data. CVSS score: 8.1/10. Published 2019-07-30.
How severe is CVE-2019-5448?: High severity. CVSS v3 base score is 8.1 out of 10.