voodoocreation/ts-deepmerge · Security
ts-deepmerge: Prototype Method Override leads to DoS
- GHSA ID
- GHSA-87mf-gv2c-c62c
- CVE ID
- CVE-2026-12644
- Severity
- medium
- Published
- Updated
- CVSS
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CVSS v3
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CVSS v4
- 5.5 · 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
Description
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.
CWEs
- CWE-248 · Uncaught Exception
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-12644 ↗
- https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8c ↗
- https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407 ↗
- https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141 ↗
- https://github.com/advisories/GHSA-87mf-gv2c-c62c ↗