Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M
CVE-2026-46378Dasel: Denial of service in dasel selector lexer due to infinite loop on unterminated regex literal
Medium 6.2
In plain English
A medium-severity infinite loop in dasel from TomWright. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Dasel is a command-line tool and library for querying, modifying, and transforming data structures. From 3.0.0 until 3.10.1, the selector lexer matchRegexPattern closure in (*Tokenizer).parseCurRune in selector/lexer/tokenize.go loops while tokenizing an unterminated regex literal such as r/ because peekRuneEqual returns false after the end of input, allowing attacker-controlled selector strings to consume CPU indefinitely. This issue is fixed in version 3.10.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | dasel | 3.11.0-1 | DEBIAN-CVE-2026-46378 |
| Go | github.com/tomwright/dasel | no fix listed | GO-2026-5493 |
| Go | github.com/tomwright/dasel/v2 | no fix listed | GO-2026-5493 |
| Go | github.com/tomwright/dasel/v3 | 3.10.1 | GO-2026-5493 |
| Go | github.com/tomwright/dasel/v3 | 3.10.1 | GHSA-m6xr-fvfg-5g64 |
| Ubuntu:26.04:LTS | dasel | no fix listed | UBUNTU-CVE-2026-46378 |
| Ubuntu:26.10 | dasel | no fix listed | UBUNTU-CVE-2026-46378 |
Affected products (as reported)
Weakness: CWE-835 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H