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AlmaLinux 9.6 [TuxCare] Security Update: python3.11 / python3.11-debug / python3.11-devel / python3.11-idle / etc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1774525255)

medium Nessus Plugin ID 361728

Synopsis

The AlmaLinux host is missing one or more security updates.

Description

The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1774525255 advisory.

 - The imaplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters. (CVE-2025-15366)

 - The poplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters. (CVE-2025-15367)

 - User-controlled header names and values containing newlines can allow injecting HTTP headers.
 (CVE-2026-0865)

 - The email module, specifically the BytesGenerator class, didn't properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized. This is only applicable if using LiteralHeader writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in BytesGenerator. (CVE-2026-1299)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages based on the guidance in TuxCare advisory ALMALINUX9.6:CLSA-2026:1774525255.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1774525255

http://www.nessus.org/u?716385d9

Plugin Details

Severity: Medium

ID: 361728

File Name: tuxcare_alma_linux_9.6_CLSA-2026-1774525255.nasl

Version: 1.1

Type: Local

Published: 10/1/2026

Updated: 10/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 52.04

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:C/A:N

CVSS Score Source: CVE-2026-1299

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6

Threat Score: 2.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list, Host/OS/extended-third-party

Exploit Ease: No known exploits are available

Patch Publication Date: 3/26/2026

Vulnerability Publication Date: 1/20/2026

Reference Information

CVE: CVE-2025-15366, CVE-2025-15367, CVE-2026-0865, CVE-2026-1299

CLSA: 2026:1774525255