OPENSUSE-SU-2026:21339-1: python-mistune security update

OPENSUSE-SU-2026:21339-1, released July 14, 2026, fixes 10 CVEs in python-mistune (version 3.1.3-160000.5.1). None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

7.5

Base score, 0 to 10

Highest EPSS

0.0065

51st percentile

Priority of the 10 CVEs

Patch now 0
                                Urgent 0
                                High 5
                                Routine 5

Fixed package versions

Product	Release	Fixed in
python-mistune	opensuse-leap 16.0	3.1.3-160000.5.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-59928	Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions	7.5	0.0065	None reported
High	CVE-2026-59922	Mistune plugins/formatting: quadratic-time parsing on long runs of `~~x~~`, `==x==`, and `^^x^^` markers (strikethrough / mark / insert)	7.5	0.0064	None reported
High	CVE-2026-59925	inline_parser: quadratic-time parsing on long runs of `x` and `*x*` emphasis pairs	7.5	0.0064	None reported
High	CVE-2026-59924	python-mistune: This update for python-mistune fixes the following issues - CVE-2026-59922: quadratic-time parsing on long runs of s...	n/a	0.0046	None reported
High	CVE-2026-59923	python-mistune: This update for python-mistune fixes the following issues - CVE-2026-59922: quadratic-time parsing on long runs of s...	n/a	0.0035	None reported
Routine	CVE-2026-59927	python-mistune: This update for python-mistune fixes the following issues - CVE-2026-59922: quadratic-time parsing on long runs of s...	n/a	0.0053	None reported
Routine	CVE-2026-59929	python-mistune: This update for python-mistune fixes the following issues - CVE-2026-59922: quadratic-time parsing on long runs of s...	n/a	0.0034	None reported
Routine	CVE-2026-59926	Mistune: XSS via unescaped class option in Admonition directive	6.1	0.0033	None reported
Routine	CVE-2026-44896	Mistune: XSS via unescaped figclass/figwidth in Figure directive	n/a	0.0020	None reported
Routine	CVE-2026-59930	Mistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering with no slugification, allowing collision with attacker-controlled `id="toc_N"` content	4.3	0.0019	None reported

Also fixes CVE-2026-59928

FEDORA-2026-340793A2F1
python-mistune, python-mistune-doc, python3-mistune on Fedora 43
SUSE-SU-2026:22655-1
python-mistune on sles 16.0

Vendor advisory

https://osv.dev/vulnerability/openSUSE-SU-2026:21339-1

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