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openSUSE 16 Security Update : python-mistune (openSUSE-SU-2026:21339-1)

medium Nessus Plugin ID 327239

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Synopsis

The remote openSUSE host is missing one or more security updates.

Description

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21339-1 advisory.

 This update for python-mistune fixes the following issues

 - CVE-2026-59922: quadratic-time parsing on long runs of some markers in `formatting.py` can lead to DoS (bsc#1271117).
 - CVE-2026-59923: `HTMLRenderer.safe_url()` does not block percent-encoded javascript URIs and allows for XSS (bsc#1271119).
 - CVE-2026-59924: improper processing of user-supplied include paths in `Include.parse()` can lead to path traversal and arbitrary file reads (bsc#1271121).
 - CVE-2026-59925: quadratic-time parsing on long runs of some emphasis pairs in `inline_parser` can lead to DoS (bsc#1271125).
 - CVE-2026-59926: improper escaping in `render_admonition()` can lead to atribute injection and XSS (bsc#1271127).
 - CVE-2026-59927: uncontrolled recursion when processing two markdown files that include each other can lead to a DoS (bsc#1271128).
 - CVE-2026-59928: quadratic-time parsing on long lists of repeated reference-link definitions in `block_parser` can lead to DoS (bsc#1271131).
 - CVE-2026-59929: HARMFUL_PROTOCOLS list misses legacy and chained schemes and allow arbitrary script execution in user agents (bsc#1271132).
 - CVE-2026-59930: the `toc` plugin and `TableOfContents` directive generate heading IDs with predictable values and allow for collisions with attacker-controlled `id=toc_N` content (bsc#1271082).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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 python313-mistune package.

See Also

https://bugzilla.suse.com/1271082

https://bugzilla.suse.com/1271117

https://bugzilla.suse.com/1271119

https://bugzilla.suse.com/1271121

https://bugzilla.suse.com/1271125

https://bugzilla.suse.com/1271127

https://bugzilla.suse.com/1271128

https://bugzilla.suse.com/1271131

https://bugzilla.suse.com/1271132

https://www.suse.com/security/cve/CVE-2026-44896

https://www.suse.com/security/cve/CVE-2026-59922

https://www.suse.com/security/cve/CVE-2026-59923

https://www.suse.com/security/cve/CVE-2026-59924

https://www.suse.com/security/cve/CVE-2026-59925

https://www.suse.com/security/cve/CVE-2026-59926

https://www.suse.com/security/cve/CVE-2026-59927

https://www.suse.com/security/cve/CVE-2026-59928

https://www.suse.com/security/cve/CVE-2026-59929

https://www.suse.com/security/cve/CVE-2026-59930

Plugin Details

Severity: Medium

ID: 327239

File Name: openSUSE-2026-21339-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/16/2026

Updated: 7/16/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.77

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2026-59926

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.5

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

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

CVSS v4

Risk Factor: Medium

Base Score: 5.3

Threat Score: 2.1

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

CPE: cpe:/o:novell:opensuse:16.0, p-cpe:/a:novell:opensuse:python313-mistune

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/14/2026

Vulnerability Publication Date: 5/8/2026

Reference Information

CVE: CVE-2026-44896, CVE-2026-59922, CVE-2026-59923, CVE-2026-59924, CVE-2026-59925, CVE-2026-59926, CVE-2026-59927, CVE-2026-59928, CVE-2026-59929, CVE-2026-59930