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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
References 4
https://github.com/squirrelchat/smol-toml/commit/30f5c367d946b695f379b5d4f0946b…
security-advisories@github.com
https://github.com/squirrelchat/smol-toml/releases/tag/v1.7.1
security-advisories@github.com
https://github.com/squirrelchat/smol-toml/security/advisories/GHSA-7w5x-hrqm-74…
security-advisories@github.com
https://medium.com/@ravindu.lakmina1/seven-bytes-that-freeze-a-node-js-server-f…
security-advisories@github.com