UnratedFix available
c-ares vulnerability
It was discovered that c-ares incorrectly handled certain query completion callbacks. An attacker could possibly use this issue to trigger a use- after-free or double-free, resulting in a denial of service or arbitrary code execution.
Announced Source revision 1
Original source ↗USN-8844-1
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:USN-8844-1
c-ares
Source reference: /affected/0/package/name
- Affected versions
- 1.34.5-1
Source reference:
/affected/0/versions1.34.6-1Source reference:
/affected/0/versions - Fixed versions
- 1.34.6-1ubuntu0.1
Source reference:
/affected/0/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": "1.34.6-1ubuntu0.1"
}
]
}
],
"package": {
"name": "c-ares",
"purl": "pkg:deb/ubuntu/c-ares?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.34.5-1",
"1.34.6-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8844-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-33630",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libc-ares2",
"binary_version": "1.34.6-1ubuntu0.1"
},
{
"binary_name": "libcares2",
"binary_version": "1.34.6-1ubuntu0.1"
}
],
"availability": "No subscription required"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #33260 · Revision 1
- Added to Heist Feed
- Publisher date