CVE-2026-61834 scim-patch: Mutation of Inherited Built-in Method Objects
Attackers can mutate global built-in objects via SCIM patch paths, potentially altering application logic in applications using scim-patch.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-61834?
CVE-2026-61834 is a medium-severity vulnerability in thomaspoignant scim-patch, published on 23 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
scim-patch is a library for applying SCIM patch operations. Prior to 0.9.2, navigate() reads inherited properties and assign() uses prototype-chain membership checks while resolving attacker-controlled SCIM PATCH paths. A path or one of the dotted value keys beginning with an inherited property such as toString can therefore traverse into a shared built-in function object and add attacker-controlled properties, causing process-global mutation that may affect application logic reading inherited-method properties. This issue is fixed in version 0.9.2.
Which versions are affected by CVE-2026-61834?
2 open source packages ship an affected version, including scim-patch.
| Package | Affected | Fixed in |
|---|---|---|
scim-patch npm | All versions | 0.9.2 |
scim-patch npm | All versions | 0.9.2 |
How do I fix CVE-2026-61834?
Upgrade scim-patch to 0.9.2 or later.
Is CVE-2026-61834 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61834 exists.
Sources
Also known as GHSA-2mhw-wcx5-v3xj.