CVE-2026-12644 is a medium-severity security vulnerability in ts-deepmerge (npm), affecting versions < 8.0.0. It is fixed in 8.0.0.
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.
CVE-2026-12644 has a CVSS score of 5.3 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (8.0.0). Upgrading removes the vulnerable code path.
npm
ts-deepmerge (< 8.0.0)ts-deepmerge → 8.0.0 (npm)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2026-12644 is reachable in your applications. Explore open-source security for your team.
See if CVE-2026-12644 is reachable in your applications. Get a demo
Upgrade ts-deepmerge to 8.0.0 or later to resolve this vulnerability.
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-12644 is a medium-severity security vulnerability in ts-deepmerge (npm), affecting versions < 8.0.0. It is fixed in 8.0.0.
CVE-2026-12644 has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
ts-deepmerge (npm) versions < 8.0.0 is affected.
Yes. CVE-2026-12644 is fixed in 8.0.0. Upgrade to this version or later.
Whether CVE-2026-12644 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade ts-deepmerge to 8.0.0 or later.