CVE-2026-39956 - jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure

CVE-2026-39956 - jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure

https://cvefeed.io/rssfeed/latest.atom / Tue, 04/14/2026 - 04:01
CVE ID :CVE-2026-39956
Published : April 13, 2026, 11:16 p.m. | 1 hour, 53 minutes ago
Description :jq is a command-line JSON processor. In commits after 69785bf77f86e2ea1b4a20ca86775916889e91c9, the _strindices builtin in jq's src/builtin.c passes its arguments directly to jv_string_indexes() without verifying they are strings, and jv_string_indexes() in src/jv.c relies solely on assert() checks that are stripped in release builds compiled with -DNDEBUG. This allows an attacker to crash jq trivially with input like _strindices(0), and by crafting a numeric value whose IEEE-754 bit pattern maps to a chosen pointer, achieve a controlled pointer dereference and limited memory read/probe primitive. Any deployment that evaluates untrusted jq filters against a release build is vulnerable. This issue has been patched in commit fdf8ef0f0810e3d365cdd5160de43db46f57ed03.
Severity: 6.1 | MEDIUM
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