GHSA-87mf-gv2c-c62c

Source

https://github.com/advisories/GHSA-87mf-gv2c-c62c

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-87mf-gv2c-c62c/GHSA-87mf-gv2c-c62c.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-87mf-gv2c-c62c

Aliases

CVE-2026-12644

Published

2026-06-19T06:31:56Z

Modified

2026-06-19T21:45:16.383267909Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
5.5 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P CVSS Calculator

Summary

ts-deepmerge: Prototype Method Override leads to DoS

Details

Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T21:41:52Z",
    "nvd_published_at": "2026-06-19T06:17:01Z",
    "severity": "MODERATE",
    "cwe_ids": [
        "CWE-248"
    ]
}

References

Affected packages

npm / ts-deepmerge

Package

Name: ts-deepmerge; View open source insights on deps.dev
Purl: pkg:npm/ts-deepmerge

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

8.0.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-87mf-gv2c-c62c/GHSA-87mf-gv2c-c62c.json"