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6.2 Medium

CVE-2026-43894 jq is a command-line JSON processor

Description

jq is a command-line JSON processor. In 1.8.1 and earlier, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).

Affected products and versions

Product Affected versions Fixed in
jq 1.8 earliest → 1.8.1 No fix stated

References

Timeline

  1. Published
  2. Last modified

Other CVEs of jq

The 23 CVEs of jq →
CVE-2026-47770 jq is a command-line JSON processor 6.8 Medium CVE-2026-49839 jq is a command-line JSON processor 7.1 High CVE-2026-54679 jq is a command-line JSON processor 6.9 Medium CVE-2026-43896 jq is a command-line JSON processor 6.2 Medium
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