CVE-2026-40345: DeepmergeTS has stack exhaustion when merging recursive object graphs

August 17, 2026

deepmerge() and deepmergeInto() can be crashed with a crafted recursive object graph. When both merged values contain self-references at the same property path, the library recurses until Node throws RangeError: Maximum call stack size exceeded.

References

github.com/RebeccaStevens/deepmerge-ts/releases/tag/v8.0.0
github.com/RebeccaStevens/deepmerge-ts/security/advisories/GHSA-ggr8-5vv4-36mx
github.com/advisories/GHSA-ggr8-5vv4-36mx
nvd.nist.gov/vuln/detail/CVE-2026-40345

Code Behaviors & Features

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