UBUNTU-CVE-2026-2950

Description

Impact: Lodash versions 4.17.23 and earlier are vulnerable to prototype pollution in the _.unset and _.omit functions. The fix for (CVE-2025-13465: https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg) only guards against string key members, so an attacker can bypass the check by passing array-wrapped path segments. This allows deletion of properties from built-in prototypes such as Object.prototype, Number.prototype, and String.prototype. The issue permits deletion of prototype properties but does not allow overwriting their original behavior. Patches: This issue is patched in 4.18.0. Workarounds: None. Upgrade to the patched version.

CVSS Metrics

• v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Systems

• ubuntu•node-lodash

  all | all | all | all | all | all | all | < 2.4.1+dfsg-3ubuntu0.1~esm1 | < 4.17.4+dfsg-1ubuntu0.1~esm1 | < 4.17.15+dfsg-2ubuntu0.1~esm1 | < 4.17.21+dfsg+~cs8.31.198.20210220-5ubuntu0.1~esm1 | < 4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.24.04.1~esm1 | < 4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.25.10.1 | < 4.17.23+dfsg-1ubuntu0.1~esm1

References (4)

• https://ubuntu.com/security/CVE-2026-2950
• https://www.cve.org/CVERecord?id=CVE-2026-2950
• https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg
• https://ubuntu.com/security/notices/USN-8411-1