> CVE-2026-47180 [MEDIUM]

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PUBLISHED
2026-07-17 19:17
MODIFIED
2026-07-17 19:17
CVSS_SCORE V3
6.5
EPSS (Prob. Exploit)
0.37%
Top 69.1%
DATA SOURCES:
NVD đź”— 2026-07-17 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-01 GITHUB đź”— 2026-11-05 OSV đź”— 2026-11-02

> DESCRIPTION

Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.5, DNSIncoming._decode_labels_at_offset recurses once per DNS-name compression pointer, and a single mDNS packet carrying chained pointers can trigger a RecursionError that escapes DNSIncoming.__init__, causing sustained CPU burn, log flooding, and degraded mDNS-dependent features for unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb). This issue is fixed in version 0.149.5.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EXPLOITABILITY
2.8
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Adjacent (A)
Exploit nécessite un accès au segment réseau local
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-674

> CWE DETAILED DESCRIPTIONS

CWE-674: Uncontrolled Recursion - The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

> GITHUB SECURITY ADVISORY

GHSA-9pgc-3ccv-5297 MODERATE

zeroconf has unbounded recursion in DNS compression-pointer decoder that allows LAN-local denial of service

AFFECTED PACKAGES:
PIP / zeroconf
< 0.149.5
Fixed in: 0.149.5

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Zeroconf: Unbounded recursion in DNS compression-pointer decoder allows LAN-local denial of service

AFFECTED PACKAGES:
Unknown / Unknown
270 versions affected
ALIASES:
GHSA-9pgc-3ccv-5297, PYSEC-2026-3436

> HISTORIQUE DES MODIFICATIONS

Première apparition
17/07/2026 19:17
Source: NVD
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-674: Uncontrolled Recursion - The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/python-zeroconf/python-zeroconf/commit/f9e23592137f30fdf7ef71...
https://github.com/python-zeroconf/python-zeroconf/pull/1719
https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.5
https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9pgc...
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