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CVE-2026-89011— isomorphic-git < 1.42.0 Prototype Pollution via getRemoteInfo

Quick assessment

Affected
isomorphic-git isomorphic-git
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

isomorphic-git 在 1.42.0 之前版本中存在原型污染漏洞，位于 函数中。该漏洞允许恶意的 Git 服务器运营者通过在 ref 协商过程中广播包含 路径段的特制 ref 名称，从而污染 。控制 Git 服务器的攻击者可以广播一个特制的 ref，例如 ，以将后续所有网络操作重定向到攻击者控制的代理服务器。当受害者使用攻击者提供的 URL 调用 时，会导致 isomorphic-git 触发受害者的 回调，并将凭据发送给攻击者。

CVSS 7.1 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-89011

Vulnerability Information
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Vulnerability Title
isomorphic-git < 1.42.0 Prototype Pollution via getRemoteInfo
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
isomorphic-git isomorphic-git 0 ~ 1.42.0 -

II. Public POCs for CVE-2026-89011

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III. Intelligence Information for CVE-2026-89011

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Patches & Fixes for CVE-2026-89011 (2)

Vendor Advisories for CVE-2026-89011 (2)

Vendor Pages for CVE-2026-89011 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1321

V. Comments for CVE-2026-89011

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