SB2026081999 - Fedora 45 update for jq
Published: August 19, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 vulnerabilities.
1) Improper Null Termination (CVE-ID: CVE-2026-33948)
CWE-ID: CWE-170 - Improper Null Termination
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to embedded-NUL truncation in jq CLI JSON input path. A remote attacker can cause validation bypass on the system.
2) Uncontrolled Recursion (CVE-ID: CVE-2026-40612)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in jv_contains when processing deeply nested arrays or objects through contains() or inside(). A local user can supply a specially crafted nested input structure to cause a denial of service.
In libjq embedded in larger applications, exploitation may corrupt adjacent memory on systems without stack guard pages or with heap-allocated thread stacks.
3) Uncontrolled Recursion (CVE-ID: CVE-2026-43896)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to uncontrolled recursion in the "jv_object_merge_recursive()" function in src/jv.c. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
4) Integer overflow (CVE-ID: CVE-2026-41257)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to integer overflow in stack_reallocate in the jq VM stack when processing deeply nested generator forks. A local user can supply crafted jq input to trigger signed integer overflow and abort the process to cause a denial of service.
In the observed case, the wrapped allocation size causes memory allocation failure and process abort. A small positive truncation may also lead to a wild memmove write before the buffer.
5) Uncontrolled Recursion (CVE-ID: CVE-2026-44777)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in jq module loader when processing mutually including modules through the -L / include mechanism. A remote attacker can provide a valid pair of mutually including modules to cause a denial of service.
Exploitation requires jq to run against attacker-influenced programs or attacker-influenced module search paths.
6) Improper Neutralization of Null Byte or NUL Character (CVE-ID: CVE-2026-41256)
CWE-ID: CWE-158 - Improper Neutralization of Null Byte or NUL Character
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass intended jq program integrity checks.
The vulnerability exists due to improper neutralization of null byte or NUL character in the top-level jq program compilation path when loading a jq program from a file with -f. A remote attacker can supply a crafted filter file containing an embedded NUL byte to bypass intended jq program integrity checks.
User interaction is required to run jq with the crafted filter file.
7) Improper Neutralization of Null Byte or NUL Character (CVE-ID: CVE-2026-43895)
CWE-ID: CWE-158 - Improper Neutralization of Null Byte or NUL Character
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise the target system.
The vulnerability exists due to improper neutralization of null byte or NUL character in src/linker.c. A local user can cause the target application to load a different module or JSON data file than the one approved by the policy layer.
Remediation
Install update from vendor's website.