What is RHSA-2026:5399?

RHSA-2026:5399 is a security advisory published by Red Hat Product Security with Medium severity. Red Hat Security Advisory: python3.12 security update

Which CVE IDs does RHSA-2026:5399 cover?

RHSA-2026:5399 covers the following CVE IDs: CVE-2025-15366, CVE-2025-15367, CVE-2026-1299. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of RHSA-2026:5399?

RHSA-2026:5399 has a CVSS v3 base score of 7.1, published by Red Hat Product Security.

RHSA-2026:5399MediumCVSS 7.1

Red Hat Security Advisory: python3.12 security update

Vendor

Red Hat Product Security

Published

March 23, 2026

Last Modified

June 25, 2026

🔗 CVE IDs covered (3)

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

📋 Description

CVE-2025-15366 — cpython: IMAP command injection in user-controlled commands CVE-2025-15367 — cpython: POP3 command injection in user-controlled commands CVE-2026-1299 — cpython: email header injection due to unquoted newlines

🔗 References (6)

selfhttps://access.redhat.com/errata/RHSA-2026:5399
externalhttps://access.redhat.com/security/updates/classification/#moderate
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_5399.json