FEDORA-2026-340793A2F1: Security update for 3 packages

FEDORA-2026-340793A2F1, released November 7, 2026, fixes 12 CVEs across 3 products. 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 12 CVEs

Patch now 0
                                Urgent 0
                                High 11
                                Routine 1

Fixed package versions

Product	Release	Fixed in
python-mistune	Fedora 43	3.3.4-1.fc43
python-mistune-doc	Fedora 43	3.3.4-1.fc43
python3-mistune	Fedora 43	3.3.4-1.fc43

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-2026-115355	python3-mistune: Update to 3.3.4	n/a	0.0046	None reported
High	CVE-2026-115352	python3-mistune: Update to 3.3.4	n/a	0.0044	None reported
High	CVE-2026-115348	python-mistune-doc: Update to 3.3.4	n/a	0.0044	None reported
High	CVE-2026-115347	python3-mistune: Update to 3.3.4	n/a	0.0041	None reported
High	CVE-2026-115353	python3-mistune: Update to 3.3.4	n/a	0.0039	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
High	CVE-2026-115349	python3-mistune: Update to 3.3.4	n/a	0.0034	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

OPENSUSE-SU-2026:21339-1
python-mistune on opensuse-leap 16.0
SUSE-SU-2026:22655-1
python-mistune on sles 16.0

Vendor advisory

https://bodhi.fedoraproject.org/updates/FEDORA-2026-340793a2f1

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