> CVE-2026-56743 [MEDIUM]

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PUBLISHED
2026-07-15 20:17
MODIFIED
2026-07-15 20:54
CVSS_SCORE V3
5.4
EPSS (Prob. Exploit)
0.25%
Top 84.7%
DATA SOURCES:
NVD đź”— 2026-07-15 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-10-25 GITHUB đź”— 2026-11-05 OSV đź”— 2026-11-02

> DESCRIPTION

Cilium is a networking, observability, and security solution. From 1.19.0 to 1.19.4, standard Kubernetes NetworkPolicy specifications using CIDR-based ipBlock rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule when Cilium is configured with a custom clusterName rather than the default any value. The parser incorrectly instantiates a pod selector on selectorless peer definitions, allowing traffic from other workloads in the same namespace as the subject of the policy. This issue is fixed in version 1.19.5.

> 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:L/UI:N/S:C/C:L/I:L/A:N
EXPLOITABILITY
2.3
IMPACT
2.7

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Changed (C)
Impact s'étend au-delà du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
Low (L)
Divulgation limitée d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
Low
Divulgation limitée d'informations
Intégrité
Low
Modification limitée des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-863

> CWE DETAILED DESCRIPTIONS

CWE-863: Incorrect Authorization - The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

> GITHUB SECURITY ADVISORY

GHSA-fm8w-2m5w-9j7r MODERATE

Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match

AFFECTED PACKAGES:
GO / github.com/cilium/cilium
>= 1.19.0, < 1.19.5
Fixed in: 1.19.5

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match

AFFECTED PACKAGES:
Unknown / Unknown
10 versions affected
ALIASES:
BIT-cilium-2026-56743, BIT-cilium-operator-2026-56743, BIT-hubble-relay-2026-56743, GHSA-fm8w-2m5w-9j7r, GO-2026-6367

> HISTORIQUE DES MODIFICATIONS

Première apparition
15/07/2026 20:17
Source: NVD
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-863: Incorrect Authorization - The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8
https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171
https://github.com/cilium/cilium/pull/46305
https://github.com/cilium/cilium/pull/46456
https://github.com/cilium/cilium/releases/tag/v1.19.5
https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r
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