CVE-2026-43894 (GCVE-0-2026-43894)

Vulnerability from cvelistv5 – Published: 2026-05-11 17:20 – Updated: 2026-05-11 18:32
VLAI
Title
jq: Wild stack write via signed-integer overflow in decNumber D2U() macro
Summary
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).
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 18:32 UTC
CWE
  • CWE-190 - Integer Overflow or Wraparound
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7616 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
jqlang jq Affected: <= 1.8.1
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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