> CVE-2025-43859 [CRITICAL]

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PUBLISHED
2025-04-24 19:15
MODIFIED
2025-04-29 13:52
CVSS_SCORE V3
9.1
EPSS (Prob. Exploit)
0.59%
Top 51.4%
DATA SOURCES:
NVD 🔗 2025-10-18 RED HAT 🔗 2025-10-18 CVE PROJECT 🔗 2026-01-19 FIRST EPSS 🔗 2026-11-08 GITHUB 🔗 2026-11-11 OSV 🔗 2026-11-08

> DESCRIPTION

h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.

> AFFECTED_PRODUCTS

Red Hat - Red Hat Ansible Automation Platform 2.5 for RHEL 8
Red Hat - Red Hat Ansible Automation Platform 2.4 for RHEL 8
Red Hat - Red Hat Ansible Automation Platform 2.5 for RHEL 9
Red Hat - Red Hat OpenStack Platform 17.1 for RHEL 9
Version: 0.12.0
Red Hat - Red Hat OpenStack Services on OpenShift 18.0
Version: 0.12.0

> CVSS V3 METRICS

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

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
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
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

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

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.4 Container Release Update
An update is now available for Red Hat Ansible Automation Platform 2.4
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Container Release Update
An update is now available for Red Hat Ansible Automation Platform 2.5
Red Hat Security Advisory: Red Hat OpenStack Platform 17.1 (python-h11) security update
An update for python-h11 is now available for Red Hat OpenStack Platform 17.1 (Wallaby). Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerabilit...
Red Hat Security Advisory: Red Hat OpenStack Platform 18.0 (python-h11) security update
An update for python-h11 is now available for Red Hat OpenStack Platform 18.0 (Antelope). Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerabili...

> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Important

> GITHUB SECURITY ADVISORY

GHSA-vqfr-h8mv-ghfj CRITICAL

h11 accepts some malformed Chunked-Encoding bodies

AFFECTED PACKAGES:
PIP / h11
< 0.16.0
Fixed in: 0.16.0

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

h11 accepts some malformed Chunked-Encoding bodies

AFFECTED PACKAGES:
Unknown / Unknown
10 versions affected
ALIASES:
GHSA-vqfr-h8mv-ghfj, PYSEC-2026-348

> HISTORIQUE DES MODIFICATIONS

Première apparition
24/04/2025 19:15
Source: NVD
📊 ENRICHISSEMENT 18/10/2025 15:03
CVEPROJECT
Champ modifié: CVE Project
Ancienne valeur:
Non
Nouvelle valeur:
Oui
📊 ENRICHISSEMENT 18/10/2025 12:16
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Important", "severity_scale": null }
📊 ENRICHISSEMENT 18/10/2025 12:16
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 3 Dernière mise à jour: 1 year ago
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