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Vulnerability Details CVE-2026-41257

jq is a command-line JSON processor. In 1.8.1 and earlier, the jq bytecode VM's data stack tracks its allocation size in a signed int. When the stack grows beyond ≈1 GiB (via deeply nested generator forks), the doubling arithmetic overflows. The wrapped value is passed to realloc and then used for a memmove with attacker-influenced offsets.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.3%
CVSS Severity
CVSS v3 Score 5.5
Products affected by CVE-2026-41257
  • Jqlang » Jq » Version: 1.0
    cpe:2.3:a:jqlang:jq:1.0
  • Jqlang » Jq » Version: 1.1
    cpe:2.3:a:jqlang:jq:1.1
  • Jqlang » Jq » Version: 1.2
    cpe:2.3:a:jqlang:jq:1.2
  • Jqlang » Jq » Version: 1.3
    cpe:2.3:a:jqlang:jq:1.3
  • Jqlang » Jq » Version: 1.4
    cpe:2.3:a:jqlang:jq:1.4
  • Jqlang » Jq » Version: 1.5
    cpe:2.3:a:jqlang:jq:1.5
  • Jqlang » Jq » Version: 1.6
    cpe:2.3:a:jqlang:jq:1.6
  • Jqlang » Jq » Version: 1.7
    cpe:2.3:a:jqlang:jq:1.7
  • Jqlang » Jq » Version: 1.7-37-g88f01a7
    cpe:2.3:a:jqlang:jq:1.7-37-g88f01a7
  • Jqlang » Jq » Version: 1.7.1
    cpe:2.3:a:jqlang:jq:1.7.1


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