CVE-2026-89011 isomorphic-git - Prototype Pollution

isomorphic-git < 1.42.0 contains a prototype pollution vulnerability caused by crafted ref names with '__proto__' path segments in getRemoteInfo, letting malicious Git server operators reroute network operations and leak credentials, exploit requires attacker-controlled Git server.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.44% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Prototype Pollution
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-1321

Vendor fix

Update to version 1.42.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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