> CVE-2026-27459 [HIGH]

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PUBLISHED
2026-03-18 00:16
MODIFIED
2026-03-18 00:16
CVSS_SCORE V3
7.2
EPSS (Prob. Exploit)
0.92%
Top 40.1%
DATA SOURCES:
NVD 🔗 2026-03-18 RED HAT 🔗 2026-03-22 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-11-05 OSV 🔗 2026-09-20 MSRC 🔗 2026-11-02

> DESCRIPTION

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.

> AFFECTED_PRODUCTS

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

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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
High (H)
Conditions spécifiques doivent être réunies 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
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-120

> CWE DETAILED DESCRIPTIONS

CWE-120: Buffer Copy without Checking Size of Input - The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: RHTAS 1.4 - GA Release of Model Transparency
The GA release of the RHTAS Model Transparency CLI image. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.4
Red Hat Security Advisory: RHUI 4.11.4 security update - python-pyOpenSSL
An updated version of Red Hat Update Infrastructure (RHUI) is now available. RHUI 4.11.4 resolves a security vulnerability in pyOpenSSL.
Red Hat Security Advisory: Red Hat Quay 3.9.21
Red Hat Quay 3.9.21 is now available with bug fixes.
Red Hat Security Advisory: Red Hat Quay 3.10.21
Red Hat Quay 3.10.21 is now available with bug fixes.
Red Hat Security Advisory: Red Hat Quay 3.12.17
Red Hat Quay 3.12.17 is now available with bug fixes.
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update
An update is now available for Red Hat Ansible Automation Platform 2.6 Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (...
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 Ansible Automation Platform 2.6 Container Release Update
An update is now available for Red Hat Ansible Automation Platform 2.6
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update
An update is now available for Red Hat Ansible Automation Platform 2.5 Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (...
Red Hat Security Advisory: Satellite 6.16.8 Async Update
An update is now available for Red Hat Satellite 6.16 for RHEL 8 and RHEL 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring Sy...
Red Hat Security Advisory: Satellite 6.18.5 Async Update
A new release is now available for Red Hat Satellite 6.18 for RHEL 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (C...
Red Hat Security Advisory: Satellite 6.17.8 Async Update
A new release is now available for Red Hat Satellite 6.17 for RHEL 9.
Red Hat Security Advisory: Red Hat Quay 3.16.4
Red Hat Quay 3.16.4 is now available with bug fixes.
Red Hat Security Advisory: Red Hat Quay 3.14.8
Red Hat Quay 3.14.8 is now available with bug fixes.
Red Hat Security Advisory: Red Hat Quay 3.17.2
Red Hat Quay 3.17.2 is now available with bug fixes.
Red Hat Security Advisory: Red Hat Quay 3.15.5
Red Hat Quay 3.15.5 is now available with bug fixes.
Red Hat Security Advisory: Red Hat Quay 3.18.0
Red Hat Quay 3.18.0 is now available with bug fixes and feature enhancements.
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.7 Container Release Update
An update is now available for Red Hat Ansible Automation Platform 2.7
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.7 Container Release Update
An update is now available for Red Hat Ansible Automation Platform 2.7
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update
An update is now available for Red Hat Ansible Automation Platform 2.6

> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Important

> GITHUB SECURITY ADVISORY

GHSA-5pwr-322w-8jr4 HIGH

pyOpenSSL DTLS cookie callback buffer overflow

AFFECTED PACKAGES:
PIP / pyopenssl
>= 22.0.0, < 26.0.0
Fixed in: 26.0.0

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

pyOpenSSL DTLS cookie callback buffer overflow

AFFECTED PACKAGES:
Unknown / Unknown
15 versions affected
ALIASES:
GHSA-5pwr-322w-8jr4, PYSEC-2026-2269

> HISTORIQUE DES MODIFICATIONS

Première apparition
18/03/2026 00:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:58
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') - The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less tha...
Nouvelle valeur:
CWE-120: Buffer Copy without Checking Size of Input - The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buf...
📊 ENRICHISSEMENT 01/04/2026 06:02
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') - The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less tha...
📊 ENRICHISSEMENT 22/03/2026 05:01
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Important", "severity_scale": null }
📊 ENRICHISSEMENT 22/03/2026 05:01
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 4 Dernière mise à jour: 1 week ago

> REFERENCES

https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/...
https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd40...
https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4
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