SB2026051149 - Multiple vulnerabilities in jq

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Main Vulnerability Database SB2026051149

SB2026051149 - Multiple vulnerabilities in jq

Published: May 11, 2026 Updated: August 19, 2026

Security Bulletin ID SB2026051149
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 7
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 14% Medium 14% Low 71%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 7 vulnerabilities.


1) Out-of-bounds write (CVE-ID: CVE-2026-43894)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to out-of-bounds write in decNumber D2U() macro in decNumberFromString when processing an extremely large decimal string via tonumber. A remote attacker can supply a specially crafted number string to cause a denial of service.

The issue is triggered by signed integer overflow and is reachable through tonumber on a string built via the multiplication operator rather than through raw JSON number parsing.


2) Stack-based buffer overflow (CVE-ID: CVE-2026-47770)

CWE-ID: CWE-121 - Stack-based buffer 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 stack-based buffer overflow in deep structural equality when parsing input. A local user can supply specially crafted input to cause a denial of service.


3) Reliance on undefined behavior (CVE-ID: N/A)

CWE-ID: CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

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 improper pointer arithmetic in jvp_utf8_backtrack in jv_unicode.c when parsing input. A local user can supply specially crafted input to cause a denial of service.


4) Reliance on undefined behavior (CVE-ID: N/A)

CWE-ID: CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

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 improper pointer arithmetic in jvp_utf8_next in jv_unicode.c when parsing input. A local user can supply crafted input to cause a denial of service.


5) Out-of-bounds write (CVE-ID: CVE-2026-49839)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/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 out-of-bounds write in the --rawfile handling in jv_load_file() when processing an attacker-controlled file. A remote attacker can supply a crafted oversized file to cause a denial of service.

User interaction is required to process the crafted file, and the heap-buffer-overflow occurs in assertion-disabled builds after a handled \"String too long\" error is reused as a string state.


6) Integer overflow (CVE-ID: CVE-2026-54679)

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 or execute arbitrary code.

The vulnerability exists due to integer overflow leading to a heap-based buffer overflow in jvp_string_append when appending data to strings on 32-bit systems. A local user can supply crafted input that triggers oversized string growth calculations to cause a denial of service or execute arbitrary code.

Only 32-bit systems are affected.


7) 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.


Remediation

Install update from vendor's website.

References