Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., "h.local" as a CNAME for "h.local"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524.
総合評価: CVE-2026-24401 は低リスク（31.9/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.25%、16 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.06% | 0.25% | +0.19% |
| 2 | 2026-05-26 | 0.03% | 0.06% | +0.03% |
| 3 | 2026-01-24 | — | 0.03% | — |
EPSS の全履歴 （全 3 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 6.5 | 3.1 | MEDIUM |
|
2.8 | 3.6 | [email protected] |
| 6.5 | 3.1 | MEDIUM |
|
2.8 | 3.6 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2026-24401: 1 source package rows (avahi); 54 state rows across 6 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 2, open 52. | https://security.alpinelinux.org/vuln/CVE-2026-24401 |
debian
|
not yet assigned | CVE-2026-24401 not yet assigned priority: Debian including 1 source packages (avahi), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. | https://security-tracker.debian.org/tracker/CVE-2026-24401 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2026-24401 |
suse
|
medium | — | https://www.suse.com/security/cve/CVE-2026-24401/ |
ubuntu
|
medium | CVE-2026-24401 medium priority: Ubuntu including 1 source packages (avahi), 8 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): needed 7, released 1. | https://ubuntu.com/security/CVE-2026-24401 |
| URL | タグ |
|---|---|
| https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524 | Patch |
| https://github.com/avahi/avahi/issues/501 | Issue Tracking Patch |
| https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3 | Vendor Advisory |