Medium severity5.9NVD Advisory· Published May 16, 2019· Updated Jun 17, 2026
CVE-2018-12556
CVE-2018-12556
Description
The signature verification routine in install.sh in yarnpkg/website through 2018-06-05 only verifies that the yarn release is signed by any (arbitrary) key in the local keyring of the user, and does not pin the signature to the yarn release key, which allows remote attackers to sign tampered yarn release packages with their own key.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- yarnpkg/websitedescription
Patches
Vulnerability mechanics
References
5- packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.htmlnvdThird Party AdvisoryVDB Entry
- seclists.org/fulldisclosure/2019/Apr/38nvdMailing ListThird Party Advisory
- github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdfnvdThird Party Advisory
- github.com/yarnpkg/website/commits/masternvdThird Party Advisory
- www.openwall.com/lists/oss-security/2019/04/30/4nvdMailing ListThird Party Advisory
News mentions
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