CVE-2026-89011
HIGH
MEDIUM
Priority: 0.03
BB Relevance:
64/100
Published: 2026-09-10
Modified: 2026-11-08
First seen: 2026-11-08
Status: active
Attack Surface
Network
Low Complexity
No Auth
Conf. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
Passive
AT:
None
VC:
High
VI:
Low
VA:
None
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.
Weakness Classification (1)
Affected Software (1)
| Vendor | Product | Version |
|---|---|---|
| isomorphic-git | isomorphic-git | 0 < 1.42.0 |
References & Advisories (5)
vendor-advisory
third-party-advisory
release-notes
patch
issue-tracking
patch