DEBIAN-CVE-2026-40164
jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to precompute key collisions offline. By supplying a crafted JSON object (~100 KB) where all keys hashed to the same bucket, hash table lookups degraded from O(1) to O(n), turning any jq expression into an O(n²) operation and causing significant CPU exhaustion. This affected common jq use cases such as CI/CD pipelines, web services, and data processing scripts, and was far more practical to exploit than existing heap overflow issues since it required only a small payload. This issue has been patched in commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784.
DEBIAN-CVE-2026-40164
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:DEBIAN-CVE-2026-40164
jq
Source reference: /affected/0/package/name
- Affected versions
- 1.6-2.1
Source reference:
/affected/0/versions1.6-2.1+deb12u1Source reference:
/affected/0/versions - Fixed versions
- 1.6-2.1+deb12u2
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
jq
Source reference: /affected/1/package/name
- Affected versions
- 1.7.1-6+deb13u1
Source reference:
/affected/1/versions - Fixed versions
- 1.7.1-6+deb13u2
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
jq
Source reference: /affected/2/package/name
- Affected versions
- 1.8.0-1
Source reference:
/affected/2/versions1.8.1-1Source reference:
/affected/2/versions1.8.1-2Source reference:
/affected/2/versions1.8.1-3Source reference:
/affected/2/versions1.8.1-4Source reference:
/affected/2/versions - Fixed versions
- 1.8.1-5
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": "1.6-2.1+deb12u2"
}
]
}
],
"package": {
"name": "jq",
"purl": "pkg:deb/debian/jq?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.6-2.1",
"1.6-2.1+deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40164.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.1-6+deb13u2"
}
]
}
],
"package": {
"name": "jq",
"purl": "pkg:deb/debian/jq?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.7.1-6+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40164.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.8.1-5"
}
]
}
],
"package": {
"name": "jq",
"purl": "pkg:deb/debian/jq?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.8.0-1",
"1.8.1-1",
"1.8.1-2",
"1.8.1-3",
"1.8.1-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40164.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56017 · Revision 1
- Added to Heist Feed
- Publisher date