What’s Vulnerable › Vulnerabilities

CVE-2026-41256: jq: Embedded NUL truncates top-level jq programs loaded with -f

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-11 · updated 2026-10-26
• Weakness: CWE-158

Description

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.

Affected products

• jqlang jq: through 1.8.1

References

• https://github.com/jqlang/jq/security/advisories/GHSA-vf2h-chrj-q3fg
• https://github.com/jqlang/jq/security/advisories/GHSA-vf2h-chrj-q3fg

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