CVE-2026-39956
Fixed in a distro release EPSS <1%CVSS 6.1
jq is a command-line JSON processor. Prior to version 1.8.2, 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, which is part of version 1.8.2.
Products: jqlang jq
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.22 | jq | 1.8.2-r0 |
| Alpine 3.23 | jq | 1.8.2-r0 |
| Alpine 3.24 | jq | 1.8.2-r0 |
| Amazon Linux 2 | jq | 1.6-17.amzn2.0.1 |
| Amazon Linux 2 | jq-devel | 1.6-17.amzn2.0.1 |
| Amazon Linux 2023 | jq | 1.8.1-59.amzn2023 |
| Amazon Linux 2023 | jq-devel | 1.8.1-59.amzn2023 |
| Debian 12 | jq | 1.6-2.1+deb12u2 |
| Debian 13 | jq | 1.7.1-6+deb13u2 |
| Debian 14 | jq | 1.8.1-5 |
| Red Hat hummingbird 1 | jq | 0:1.8.1-3.hum1 |
| Red Hat hummingbird 1 | jq-devel | 0:1.8.1-3.hum1 |
| SUSE Linux Enterprise Micro 5.3 | jq | 1.6-150000.3.20.1 |
| SUSE Linux Enterprise Micro 5.4 | jq | 1.6-150000.3.20.1 |
| SUSE Linux Enterprise Micro 5.5 | jq | 1.6-150000.3.20.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | jq | 1.6-150000.3.20.1 |
| SUSE Linux Enterprise Server 16.0 | jq | 1.7.1-160000.3.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | jq | 1.7.1-160000.3.1 |
| SUSE Linux Micro 6.0 | jq | 1.6-6.1 |
| SUSE Linux Micro 6.1 | jq | 1.7.1-slfo.1.1_3.1 |
| SUSE Linux Micro 6.2 | jq | 1.7.1-160000.3.1 |
| Ubuntu 22.04 LTS | jq | 1.6-2.1ubuntu3.2 |
| Ubuntu 24.04 LTS | jq | 1.7.1-3ubuntu0.24.04.2 |
| Ubuntu 25.10 | jq | 1.8.1-3ubuntu1.1 |
| Ubuntu 26.04 LTS | jq | 1.8.1-4ubuntu2 |
| Ubuntu Pro 14.04 LTS | jq | 1.3-1.1ubuntu1.1+esm4 |
| Ubuntu Pro 16.04 LTS | jq | 1.5+dfsg-1ubuntu0.1+esm4 |
| Ubuntu Pro 18.04 LTS | jq | 1.5+dfsg-2ubuntu0.1~esm2 |
| Ubuntu Pro 20.04 LTS | jq | 1.6-1ubuntu0.20.04.1+esm2 |
| openSUSE Leap 16.0 | jq | 1.7.1-160000.3.1 |
| openSUSE Tumbleweed | jq | 1.8.1-3.1 |