CVE-2019-3881

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-09-04 · updated 2026-06-17
Weakness: CWE-427

Description

Bundler prior to 2.1.0 uses a predictable path in /tmp/, created with insecure permissions as a storage location for gems, if locations under the user's home directory are not available. If Bundler is used in a scenario where the user does not have a writable home directory, an attacker could place malicious code in this directory that would be later loaded and executed.

Affected products

rubygem-bundler: before 2.1.0 — fixed in 2.1.0

How to fix

Upgrade to a fixed version: rubygem-bundler 2.1.0. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1651826
https://bugzilla.redhat.com/show_bug.cgi?id=1651826

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