Vulnerability in Tomwright Dasel
CVE-2026-62866
Dasel is a command-line tool and library for querying, modifying, and transforming data structures. From 3.0.0 until 3.11.2, selector/lexer/tokenize.go parseCurRune advances the input index across trailing whitespace and then reads the source at the exhausted index without an end-of-input check. A selector ending in whitespace, including input passed through lexer.NewTokenizer(...).Tokenize() or dasel.Query, can therefore cause an index-out-of-range panic and terminate the process. This issue is fixed in version 3.11.2.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Tomwright Dasel — versions >= 3.0.0, < 3.11.2
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-62866?
- CVE-2026-62866 is a medium-severity vulnerability in Tomwright Dasel, classified under Improper Validation of Array Index. CVSS score: 6.2/10. Published 2026-09-21.
- How severe is CVE-2026-62866?
- Medium severity. CVSS v3 base score is 6.2 out of 10.