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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是isomorphic-git组织开源的一个Git纯JavaScript实现。 isomorphic-git 1.42.0之前版本存在输入验证错误漏洞，该漏洞源于getRemoteInfo函数在ref协商期间未正确处理包含“__proto__”路径段的特制ref名称，导致原型污染，攻击者可通过控制Git服务器广告特制ref并重路由网络操作，诱使受害者在调用getRemoteInfo时触发onAuth回调并泄露凭据。

CVSS 7.1 · High EPSS 0.44% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
isomorphic-git isomorphic-git < 1.42.0 affected
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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
Vulnerability Title
isomorphic-git 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
isomorphic-git是isomorphic-git组织开源的一个Git纯JavaScript实现。 isomorphic-git 1.42.0之前版本存在输入验证错误漏洞，该漏洞源于getRemoteInfo函数在ref协商期间未正确处理包含“__proto__”路径段的特制ref名称，导致原型污染，攻击者可通过控制Git服务器广告特制ref并重路由网络操作，诱使受害者在调用getRemoteInfo时触发onAuth回调并泄露凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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