CVE-2026-43894

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).

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Produits concernés

• jqlang jq

Scores CVSS

Faiblesses (CWE)

• CWE-190

Références

• https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g ExploitMitigationVendor Advisory
• https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g ExploitMitigationVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories