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.
References
| Link | Resource |
|---|---|
| https://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03 | Patch |
| https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28 | Exploit Vendor Advisory |
| https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28 | Exploit Vendor Advisory |
Configurations
History
21 Apr 2026, 23:54
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03 - Patch | |
| References | () https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28 - Exploit, Vendor Advisory | |
| First Time |
Jqlang
Jqlang jq |
|
| CPE | cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:* |
14 Apr 2026, 17:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28 - |
13 Apr 2026, 23:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-13 23:16
Updated : 2026-04-21 23:54
NVD link : CVE-2026-39956
Mitre link : CVE-2026-39956
CVE.ORG link : CVE-2026-39956
JSON object : View
Products Affected
jqlang
- jq