What is RHSA-2026:6253?

RHSA-2026:6253 is a security advisory published by Red Hat Product Security with Medium severity. Red Hat Security Advisory: python3.11 security update

Which CVE IDs does RHSA-2026:6253 cover?

RHSA-2026:6253 covers the following CVE IDs: CVE-2025-15367, CVE-2026-0865, CVE-2026-1299, CVE-2025-15366. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of RHSA-2026:6253?

RHSA-2026:6253 has a CVSS v3 base score of 7.1, published by Red Hat Product Security.

RHSA-2026:6253MediumCVSS 7.1

Red Hat Security Advisory: python3.11 security update

Vendor

Red Hat Product Security

Published

March 31, 2026

Last Modified

June 25, 2026

🔗 CVE IDs covered (4)

CVE-2025-15367 →CVE-2026-0865 →CVE-2026-1299 →CVE-2025-15366 →

📋 Description

CVE-2025-15366 — cpython: IMAP command injection in user-controlled commands CVE-2025-15367 — cpython: POP3 command injection in user-controlled commands CVE-2026-0865 — cpython: wsgiref.headers.Headers allows header newline injection in Python CVE-2026-1299 — cpython: email header injection due to unquoted newlines

🔗 References (7)

selfhttps://access.redhat.com/errata/RHSA-2026:6253
externalhttps://access.redhat.com/security/updates/classification/#moderate
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2431367
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2431368
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2431373
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2432437
selfhttps://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_6253.json