CVE-2026-115351Medium· 4.7▾ SunlitA flaw was found in mistune. A remote attacker with control over markdown content can cause information disclosure by performing Cascading Style Sheets (CSS) injection through the unvalidated figwidth option in the figure directive. By ins…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 25.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 25.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
Last analysed / modified upstream
0.2%
A flaw was found in mistune. A remote attacker with control over markdown content can cause information disclosure by performing Cascading Style Sheets (CSS) injection through the unvalidated figwidth option in the figure directive. By inserting arbitrary style rules into rendered web pages, the attacker can force a victim's browser to send requests to an external server and leak sensitive data.
mistune: mistune: Information disclosure via CSS injection in figure directive — rated Moderate by Red Hat. Released 2026-10-22, updated 2026-10-23.
Affected:
No fix planned:
Fix deferred
Connected by shared product, vendor, weakness, or advisory.
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