ALPINE-CVE-2026-39956
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.
ALPINE-CVE-2026-39956
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:ALPINE-CVE-2026-39956
jq
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.8.2-r0
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
jq
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.8.2-r0
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
jq
Source reference: /affected/2/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.8.2-r0
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2026-04-02"
},
{
"fixed": "1.8.2-r0"
}
]
}
],
"package": {
"name": "jq",
"purl": "pkg:apk/alpine/jq?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-39956.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2026-04-02"
},
{
"fixed": "1.8.2-r0"
}
]
}
],
"package": {
"name": "jq",
"purl": "pkg:apk/alpine/jq?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-39956.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2026-04-02"
},
{
"fixed": "1.8.2-r0"
}
]
}
],
"package": {
"name": "jq",
"purl": "pkg:apk/alpine/jq?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-39956.json"
},
"ecosystem_specific": {}
}
]Publisher severity
No explicit severity was provided.
- Event
- #54328 · Revision 1
- Added to Heist Feed
- Publisher date