scim-patch: Mutation of Inherited Built-in Method Objects (CVE-2026-61834) | HOL Guard CVE

Medium · CVSS 4.3CVE-2026-61834

scim-patch: Mutation of Inherited Built-in Method Objects

Answer in brief

CVE-2026-61834 records a Medium severity (CVSS 4.3) vulnerability in scim-patch: Mutation of Inherited Built-in Method Objects. The current sources do not mark it as known exploited. The current feed maps thomaspoignant/scim-patch (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 23, 2026Updated Sep 23, 2026Source checked Sep 23, 2026First seen by HOL Sep 23, 2026Material review Sep 23, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps thomaspoignant/scim-patch (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
thomaspoignant/scim-patchgeneric	<0.9.2	0.9.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for thomaspoignant/scim-patch.
Review the reported fix. Update thomaspoignant/scim-patch to 0.9.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 23, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.