Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M
CVE-2026-46377Dasel: Index-out-of-range panic in dasel selector lexer on trailing backslash in quoted string
Medium 6.2
In plain English
A medium-severity security flaw 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 9% 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 escape sequence handler in (*Tokenizer).parseCurRune in selector/lexer/tokenize.go increments past a trailing backslash in a quoted string such as "\ or '\ and then reads p.src[pos] without a bounds check, allowing attacker-controlled selector strings to trigger a Go index-out-of-range panic. 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-2026-46377 |
| Go | github.com/tomwright/dasel | no fix listed | GO-2026-5491 |
| Go | github.com/tomwright/dasel/v2 | no fix listed | GO-2026-5491 |
| Go | github.com/tomwright/dasel/v3 | no fix listed | GO-2026-5491 |
| Go | github.com/tomwright/dasel/v3 | no fix listed | GHSA-m5j3-4634-c2vq |
| Ubuntu:26.04:LTS | dasel | no fix listed | UBUNTU-CVE-2026-46377 |
| Ubuntu:26.10 | dasel | no fix listed | UBUNTU-CVE-2026-46377 |
Affected products (as reported)
Weakness: CWE-129 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/TomWright/dasel/security/advisories/GHSA-m5j3-4634-c2vq x_refsource_CONFIRM
- https://github.com/TomWright/dasel/commit/5fc1172287df89860caf139b146007d7ed12178c x_refsource_MISC
- https://github.com/TomWright/dasel/releases/tag/v3.10.1 x_refsource_MISC