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CVE-2026-40345— deepmerge-ts: Stack exhaustion when merging recursive object graphs

Quick assessment

Affected
RebeccaStevens deepmerge-ts
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

deepmerge-ts 是一个 TypeScript 库，提供了对 JavaScript 对象进行深度合并的功能。在 8.0.0 版本之前，deepmerge、deepmergeCustom、deepmergeInto 和 deepmergeIntoCustom 这些 API 在递归合并记录（records）时，不会追踪已访问过的对象或对象对。当两个输入值在同一属性路径上包含自引用（self-references）时，合并逻辑会反复访问相同的对象对，直到 Node.js 抛出 “RangeError: Maxim

CVSS 8.2 · High EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
RebeccaStevens deepmerge-ts < 8.0.0 affected
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I. Basic Information for CVE-2026-40345

Vulnerability Information
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Vulnerability Title
deepmerge-ts: Stack exhaustion when merging recursive object graphs
Source: CVE Program / CVE List V5
Vulnerability Description
deepmerge-ts is a typescript library providing functionality to deep merging of javascript objects. Prior to 8.0.0, the deepmerge, deepmergeCustom, deepmergeInto, and deepmergeIntoCustom APIs do not track visited objects or object pairs when recursively merging records. When two input values contain self-references at the same property path, the merge logic repeatedly revisits the same pair until Node.js raises RangeError: Maximum call stack size exceeded. Applications that merge attacker-controlled recursive object graphs can synchronously crash the affected process or cause repeated worker restarts. Plain JSON input alone cannot create the recursive graph required to trigger the issue. This issue is fixed in version 8.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
RebeccaStevens deepmerge-ts < 8.0.0 -

II. Public POCs for CVE-2026-40345

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7933 chars
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III. Intelligence Information for CVE-2026-40345

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Vendor Advisories for CVE-2026-40345 (1)

Other References for CVE-2026-40345 (1)

IV. Related Vulnerabilities

Same product: deepmerge-ts
Same vendor: RebeccaStevens
Same weakness: CWE-674

V. Comments for CVE-2026-40345

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