ALPINE-CVE-2026-39979
jq is a command-line JSON processor. In commits before 2f09060afab23fe9390cce7cb860b10416e1bf5f, the jv_parse_sized() API in libjq accepts a counted buffer with an explicit length parameter, but its error-handling path formats the input buffer using %s in jv_string_fmt(), which reads until a NUL terminator is found rather than respecting the caller-supplied length. This means that when malformed JSON is passed in a non-NUL-terminated buffer, the error construction logic performs an out-of-bounds read past the end of the buffer. The vulnerability is reachable by any libjq consumer calling jv_parse_sized() with untrusted input, and depending on memory layout, can result in memory disclosure or process termination. The issue has been patched in commit 2f09060afab23fe9390cce7cb860b10416e1bf5f.
ALPINE-CVE-2026-39979
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-2026-39979
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": "0"
},
{
"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-2026-39979.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"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-2026-39979.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"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-2026-39979.json"
},
"ecosystem_specific": {}
}
]Publisher severity
No explicit severity was provided.
- Event
- #54329 · Revision 1
- Added to Heist Feed
- Publisher date