ts-deepmerge up to 7.x uncaught exception

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k3.28

Summaryinfo

A vulnerability, which was classified as problematic, has been found in ts-deepmerge up to 7.x. This vulnerability affects unknown code. This manipulation causes uncaught exception. This vulnerability is handled as CVE-2026-12644. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in ts-deepmerge up to 7.x. Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a uncaught exception vulnerability. The CWE definition for the vulnerability is CWE-248. An exception is thrown from a function, but it is not caught. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at security.snyk.io. This vulnerability is known as CVE-2026-12644 since 06/18/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

It is declared as proof-of-concept.

Upgrading to version 8.0.0 eliminates this vulnerability. Applying the patch 305a05831a462fb2c353d3cbbff55a0733286f8c is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-37991). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (snyk): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uncaught exception
CWE: CWE-248
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Proof-of-Concept
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: ts-deepmerge 8.0.0
Patch: 305a05831a462fb2c353d3cbbff55a0733286f8c

Timelineinfo

06/18/2026 CVE reserved
06/19/2026 +1 days Advisory disclosed
06/19/2026 +0 days VulDB entry created
06/19/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: SNYK-JS-TSDEEPMERGE-17339141
Status: Confirmed

CVE: CVE-2026-12644 (🔒)
GCVE (CVE): GCVE-0-2026-12644
GCVE (VulDB): GCVE-100-372331
EUVD: 🔒

Entryinfo

Created: 06/19/2026 08:56
Updated: 06/19/2026 16:11
Changes: 06/19/2026 08:56 (77), 06/19/2026 16:11 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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