| Name | CVE-2026-69186 |
| Description | GHSA-jv8r-gqr9-68wj: Memory-amplification denial of service via unvalidated DNS header record counts |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| c-ares (PTS) | bullseye, bullseye (security) | 1.17.1-1+deb11u3 | fixed |
| bookworm | 1.18.1-3 | fixed |
| trixie, trixie (security) | 1.34.5-1+deb13u1 | vulnerable |
| forky, sid | 1.34.8-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| c-ares | source | bullseye | (not affected) | | | |
| c-ares | source | bookworm | (not affected) | | | |
| c-ares | source | (unstable) | 1.34.7-1 | | | |
Notes
[trixie] - c-ares <no-dsa> (Minor issue)
[bookworm] - c-ares <not-affected> (New DNS-record parser prealloc (ares_dns_record_rr_prealloc/ares_array_set_size) not present; introduced in the 1.20+ rewrite)
[bullseye] - c-ares <not-affected> (New DNS-record parser prealloc not present; introduced in the 1.20+ rewrite)
https://www.openwall.com/lists/oss-security/2026/07/06/8
https://github.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wj
Fixed by: https://github.com/c-ares/c-ares/commit/eaded4cb200b2a5f8d73f11021ff7c8d6968aaab (main)
Fixed by: https://github.com/c-ares/c-ares/commit/e47c203f91cd8b749c8736bc18d75a31ffdec8f4 (v1.34.7)