inline_parser: quadratic-time parsing on long runs of `**x**` and `***x***` emphasis pairs
CVE-2026-59925 is fixed in 3 products on 1 platform, first by SUSE-SU-2026:22655-1, released July 14, 2026. It is not reported as exploited. Patch Radar priority: High.
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).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-mistune · Fedora 43 | 3.3.4-1.fc43 | FEDORA-2026-340793A2F1 | Nov 7, 2026 |
| python-mistune · opensuse-leap 16.0 | 3.1.3-160000.5.1 | OPENSUSE-SU-2026:21339-1 | Jul 14, 2026 |
| python-mistune · sles 16.0 | 3.1.3-160000.5.1 | SUSE-SU-2026:22655-1 | Jul 14, 2026 |
| python-mistune-doc · Fedora 43 | 3.3.4-1.fc43 | FEDORA-2026-340793A2F1 | Nov 7, 2026 |
| python3-mistune · Fedora 43 | 3.3.4-1.fc43 | FEDORA-2026-340793A2F1 | Nov 7, 2026 |
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