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CVE-2026-49293— CPU exhaustion via O(n^2) BigInt construction on radix-prefixed integer literals

Quick assessment

Affected
sunnyadn js-toml
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.

sunnyadn js-toml是sunnyadn个人开发者开源的一个TOML解析库。 sunnyadn js-toml 1.1.1之前版本存在资源管理错误漏洞，该漏洞源于解析十六进制/八进制/二进制整数时，手工编写的 循环导致CPU资源过度消耗，攻击者可通过 函数加载特制TOML文档实施单请求CPU耗尽拒绝服务攻击。

CVSS 7.5 · High EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
sunnyadn js-toml < 1.1.1 affected
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I. Basic Information for CVE-2026-49293

Vulnerability Information
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Vulnerability Title
CPU exhaustion via O(n^2) BigInt construction on radix-prefixed integer literals
Source: CVE Program / CVE List V5
Vulnerability Description
js-toml is a TOML parser for JavaScript, fully compliant with the TOML 1.0.0 Spec. Versions up to and including 1.1.0 parse hexadecimal / octal / binary integer literals via a hand-written `parseBigInt` loop that multiplies a `BigInt` accumulator by the radix once per input digit. Each iteration performs a `BigInt * BigInt` operation on an accumulator that grows linearly with the number of digits already consumed, so the whole loop is O(n²) in the literal length. The lexer regex places no upper bound on the literal length, so a single TOML document containing one ~500 kB hex literal pins one CPU core for ~40 seconds on a modern laptop (Apple M-series, Node v22). Memory amplification is bounded but CPU amplification is severe and grows quadratically: doubling the literal length quadruples the work. A caller that invokes `load()` on attacker-controlled TOML (configuration upload endpoints, CI/CD systems ingesting third-party `*.toml`, IDE plugins, build tools) is exposed to a single-request CPU exhaustion DoS. Version 1.1.1 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
sunnyadn js-toml 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sunnyadn js-toml是sunnyadn个人开发者开源的一个TOML解析库。 sunnyadn js-toml 1.1.1之前版本存在资源管理错误漏洞，该漏洞源于解析十六进制/八进制/二进制整数时，手工编写的`parseBigInt`循环导致CPU资源过度消耗，攻击者可通过`load()`函数加载特制TOML文档实施单请求CPU耗尽拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sunnyadn js-toml < 1.1.1 -

II. Public POCs for CVE-2026-49293

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7098 chars
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III. Intelligence Information for CVE-2026-49293

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Patches & Fixes for CVE-2026-49293 (1)

Vendor Advisories for CVE-2026-49293 (1)

Other References for CVE-2026-49293 (1)

IV. Related Vulnerabilities

Same product: js-toml
Same vendor: sunnyadn
Same weakness: CWE-400

V. Comments for CVE-2026-49293

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