How severe is CVE-2019-3881?

CVE-2019-3881 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-3881 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-3881?

CVE-2019-3881 affects Bundler. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-3881?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-3881 published?

CVE-2019-3881 was published on 2020-09-04 and last updated on 2026-06-17.

CVE-2019-3881

CVE-2019-3881 is a high-severity vulnerability in Bundler with a CVSS 3.x base score of 7.8. 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-427.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.4
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-427
Affected product: Bundler
Published: 2020-09-04
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-3881?: 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.
How severe is CVE-2019-3881?: CVE-2019-3881 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-3881 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-3881?: CVE-2019-3881 affects Bundler. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-3881?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-3881 published?: CVE-2019-3881 was published on 2020-09-04 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:bundler:bundler:*:*:*:*:*:ruby:*:*

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Other CWE-427 (Uncontrolled Search Path Element) vulnerabilities

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CVE-2019-25268 — Critical (CVSS 9.8): NREL BEopt 2.8.0.0 contains a DLL hijacking vulnerability that allows attackers to load arbitrary libraries by tricking…
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Browse all CWE-427 (Uncontrolled Search Path Element) vulnerabilities →