CVE-2026-41256
jq: Embedded NUL truncates top-level jq programs loaded with -f
CVSS Score
5.5
EPSS Score
0.0%
EPSS Percentile
0th
jq is a command-line JSON processor. In 1.8.1 and earlier, Top-level jq programs loaded from a file with -f are truncated at the first embedded NUL byte on current upstream HEAD. A crafted filter file such as . followed by \x00 and arbitrary suffix compiles and executes as only the prefix before the NUL. This leaves jq with a post-CVE-2026-33948 prefix/full-buffer mismatch on the compilation path even though the JSON parser path has already been fixed.
| CWE | CWE-158 |
| Vendor | jqlang |
| Product | jq |
| Published | May 11, 2026 |
| Last Updated | May 11, 2026 |
Stay Ahead of the Next One
Get instant alerts for jqlang jq
Be the first to know when new medium vulnerabilities affecting jqlang jq are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
jqlang / jq
<= 1.8.1