What’s Vulnerable › Vulnerabilities

CVE-2026-85730: smol-toml: Denial of Service via malformed TOML documents

• Severity: high (CVSS 8.2 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-09
• Weakness: CWE-606

Description

smol-toml is a small, fast, and correct TOML parser and serializer. Prior to 1.7.1, parse() can enter an infinite loop when a value inside an array or inline table is followed by a comment with no trailing newline. In src/util.ts, skipUntil() calls indexOfNewline(), receives -1 at the end of input, and resets the cursor to the beginning of the string instead of leaving the structure scan. The parser then hangs indefinitely and can consume a service's processing capacity when an application parses attacker-controlled TOML. This issue is fixed in version 1.7.1.

Affected products

• squirrelchat smol-toml: before 1.7.1

References

• https://github.com/squirrelchat/smol-toml/commit/30f5c367d946b695f379b5d4f0946b2f0a0a8c2f
• https://github.com/squirrelchat/smol-toml/releases/tag/v1.7.1
• https://github.com/squirrelchat/smol-toml/security/advisories/GHSA-7w5x-hrqm-74c2
• https://medium.com/@ravindu.lakmina1/seven-bytes-that-freeze-a-node-js-server-forever-the-story-of-cve-2026-85730-3213328b38f0
• https://github.com/squirrelchat/smol-toml/security/advisories/GHSA-7w5x-hrqm-74c2

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