Red Hat Security Advisory: python3.11 security update
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * cpython: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865) * cpython: IMAP command injection in user-controlled commands (CVE-2025-15366) * cpython: POP3 command injection in user-controlled commands (CVE-2025-15367) * cpython: email header injection due to unquoted newlines (CVE-2026-1299) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
This Red Hat security advisory (RHSA-2026:6253) addresses several vulnerabilities in python3.11 related to injection attacks: CVE-2026-0865 (header newline injection in wsgiref.headers.Headers), CVE-2025-15366 (IMAP command injection via user-controlled commands), CVE-2025-15367 (POP3 command injection via user-controlled commands), and CVE-2026-1299 (email header injection due to unquoted newlines). These vulnerabilities could allow attackers to inject malicious commands or headers in affected Python modules. The advisory applies to Red Hat Enterprise Linux 9.4 Extended Update Support and related variants. Red Hat has released updated python3.11 packages to fix these issues.
Potential Impact
The vulnerabilities allow injection attacks in Python modules handling IMAP, POP3, and HTTP headers, potentially enabling attackers to manipulate commands or headers via user-controlled input. This could lead to security issues such as command injection or header injection in applications using these Python components. Red Hat rates the overall security impact as Moderate.
Mitigation Recommendations
Red Hat has released updated python3.11 packages for Red Hat Enterprise Linux 9.4 Extended Update Support that fix these vulnerabilities. Users should apply the provided security update as detailed in the Red Hat advisory RHSA-2026:6253 and the referenced article https://access.redhat.com/articles/11258. No additional mitigations are specified or required beyond applying the official update.
Red Hat Security Advisory: python3.11 security update
Description
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * cpython: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865) * cpython: IMAP command injection in user-controlled commands (CVE-2025-15366) * cpython: POP3 command injection in user-controlled commands (CVE-2025-15367) * cpython: email header injection due to unquoted newlines (CVE-2026-1299) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory (RHSA-2026:6253) addresses several vulnerabilities in python3.11 related to injection attacks: CVE-2026-0865 (header newline injection in wsgiref.headers.Headers), CVE-2025-15366 (IMAP command injection via user-controlled commands), CVE-2025-15367 (POP3 command injection via user-controlled commands), and CVE-2026-1299 (email header injection due to unquoted newlines). These vulnerabilities could allow attackers to inject malicious commands or headers in affected Python modules. The advisory applies to Red Hat Enterprise Linux 9.4 Extended Update Support and related variants. Red Hat has released updated python3.11 packages to fix these issues.
Potential Impact
The vulnerabilities allow injection attacks in Python modules handling IMAP, POP3, and HTTP headers, potentially enabling attackers to manipulate commands or headers via user-controlled input. This could lead to security issues such as command injection or header injection in applications using these Python components. Red Hat rates the overall security impact as Moderate.
Mitigation Recommendations
Red Hat has released updated python3.11 packages for Red Hat Enterprise Linux 9.4 Extended Update Support that fix these vulnerabilities. Users should apply the provided security update as detailed in the Red Hat advisory RHSA-2026:6253 and the referenced article https://access.redhat.com/articles/11258. No additional mitigations are specified or required beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:6253
- Cve Count
- 4
- Additional Cves
- ["CVE-2025-15367","CVE-2026-0865","CVE-2026-1299"]
- Cvss Version
- null
Threat ID: 6a175eeee29bf47b50edc5cf
Added to database: 05/27/2026, 21:15:26 UTC
Last enriched: 07/03/2026, 00:28:50 UTC
Last updated: 07/31/2026, 19:22:53 UTC
Views: 66
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