DEBIAN-CVE-2026-69184
c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_name_parse() enforces backward DNS compression pointers but does not bound the total pointer hops or assembled name length. A malicious DNS server can send a response containing a long descending pointer chain and many resource records whose NAME or RDATA fields refer to the chain, causing repeated decompression work that grows quadratically with message size. A single crafted response can stall the single-threaded c-ares event loop and deny DNS resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.
DEBIAN-CVE-2026-69184
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-2026-69184
c-ares
Source reference: /affected/0/package/name
- Affected versions
- 1.34.5-1
Source reference:
/affected/0/versions1.34.5-1+deb13u1Source reference:
/affected/0/versions1.34.6-1Source reference:
/affected/0/versions1.34.7-1Source reference:
/affected/0/versions1.34.8-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
c-ares
Source reference: /affected/1/package/name
- Affected versions
- 1.34.5-1
Source reference:
/affected/1/versions1.34.6-1Source reference:
/affected/1/versions - Fixed versions
- 1.34.7-1
Source reference:
/affected/1/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"
}
]
}
],
"package": {
"name": "c-ares",
"purl": "pkg:deb/debian/c-ares?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.34.5-1",
"1.34.5-1+deb13u1",
"1.34.6-1",
"1.34.7-1",
"1.34.8-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-69184.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.34.7-1"
}
]
}
],
"package": {
"name": "c-ares",
"purl": "pkg:deb/debian/c-ares?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.34.5-1",
"1.34.6-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-69184.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #15056 · Revision 1
- Added to Heist Feed
- Publisher date