CVE-2026-89011: Isomorphic-Git

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

isomorphic-git before 1.42.0 contains a prototype pollution vulnerability in the getRemoteInfo function that allows a malicious Git server operator to pollute Object.prototype by advertising crafted ref names containing '__proto__' path segments during ref negotiation. Attackers controlling a Git server can advertise a specially crafted ref such as '__proto__/corsProxy' to reroute all subsequent network operations through an attacker-controlled proxy, causing isomorphic-git to invoke the victim's onAuth callback and transmit credentials to the attacker when the victim calls getRemoteInfo with an attacker-supplied URL.

Affected products

• Isomorphic-Git Isomorphic-Git: before 1.42.0 (fixed in 1.42.0)

Published 2026-09-10. Last modified 2026-09-23.