sumatrapdf vulnerabilities and fixes

Recent CVEs affecting sumatrapdf, with upgrade or downgrade steps. 3 tracked.

sumatrapdf has 3 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 1. Most recent: 2026-01-22. Highest priority: CVE-2025-57248 (score 39/100).

• CVE-2026-23951 MEDIUM 5.5 MITIGATE SumatraPDF is a multi-format reader for Windows
• CVE-2026-23512 HIGH 8.6 UPGRADE SumatraPDF is a multi-format reader for Windows
• CVE-2025-57248 HIGH 7.3 DOWNGRADE A null pointer dereference vulnerability was discovered in SumatraPDF 3.5.2 during the processing of a crafted

FAQ

How do I fix sumatrapdf vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is sumatrapdf being exploited right now?

None of the tracked sumatrapdf CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which sumatrapdf CVE should I patch first?

CVE-2025-57248 currently ranks highest (39/100): A null pointer dereference vulnerability was discovered in SumatraPDF 3.5.2 during the processing of a crafted.

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