CVE-2018-12556
The signature verification routine in install.sh in yarnpkg/website through 2018-06-05 only...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2018-12556- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-347
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2018-12556- Updated
- 2026-11-02
EUVDEUVD-2018-4516 No score
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.
- Record
EUVD-2018-4516- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8mxx-g9vw-r875
The signature verification routine in install.sh in yarnpkg/website through 2018-06-05 only...
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.
- Record
GHSA-8mxx-g9vw-r875- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-347
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2018-12556
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.
- Record
UBUNTU-CVE-2018-12556- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
node-yarnpkgUbuntu:20.04:LTS |
All versions, plus listed versions 1.13.0-1build11.13.0-31.19.1-11.22.4-2 |
None known |
node-yarnpkgUbuntu:22.04:LTS |
All versions, plus listed versions 1.22.10+~cs22.25.14-31.22.10+~cs22.25.14-41.22.10+~cs22.25.14-51.22.10+~cs22.25.14-8 |
None known |
node-yarnpkgUbuntu:24.04:LTS |
All versions, plus listed versions 1.22.19+~cs24.27.18-21.22.19+~cs24.27.18-4 |
None known |
node-yarnpkgUbuntu:25.10 |
All versions, plus listed versions 4.0.2+dfsg-34.1.0+dfsg-1 |
None known |
node-yarnpkgUbuntu:26.10 |
All versions, plus listed versions 4.1.0+dfsg-14.1.0+dfsg-6ubuntu24.1.0+dfsg-7ubuntu1 |
None known |
node-yarnpkgUbuntu:26.04:LTS |
All versions, plus listed versions 4.1.0+dfsg-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-12556 is a medium vulnerability (CVSS 5.9) in Yarnpkg Website, published May 16, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.77%, the 78th percentile. No source names a fixed version.