CPU exhaustion via quadratic BigInt parsing
Published Jun 19, 2026 · Updated Jun 19, 2026
Algorithmic complexity in sunnyadn js-toml 1.1.0 and earlier allows remote attackers to interrupt services with crafted TOML. The NonDecimalInteger interpreter sends oversized hexadecimal, octal, or binary digits through parseBigInt, whose growing BigInt accumulator is multiplied once per digit and produces quadratic CPU work. Exploitation requires a caller to pass attacker-controlled TOML to load(); one large literal blocks a Node.js event loop and interrupts concurrent request handling.
Summary
What happened
Algorithmic complexity in sunnyadn js-toml 1.1.0 and earlier allows remote attackers to interrupt services with crafted TOML. The NonDecimalInteger interpreter sends oversized hexadecimal, octal, or binary digits through parseBigInt, whose growing BigInt accumulator is multiplied once per digit and produces quadratic CPU work. Exploitation requires a caller to pass attacker-controlled TOML to load(); one large literal blocks a Node.js event loop and interrupts concurrent request handling.
The record
- CVE
- CVE-2026-49293
- Published
- Jun 19, 2026
- Updated
- Jun 19, 2026
- Vendor
- sunnyadn
- Product
- js-toml
- Classifications
- CWE-407, CWE-1333, CWE-400, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 19, 2026CVE publishedPublication date reported by the CVE source.
- Jun 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.1.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-wp3c-266w-4qfq end-to-end reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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