CVE-2026-23512
Untrusted path in SumatraPDF <=3.5.2 enables arbitrary code via spoofed notepad.exe.
Is CVE-2026-23512 being exploited?
Not confirmed. CVE-2026-23512 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-23512?
CVE-2026-23512 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-23512?
Yes. A fix has been recorded for CVE-2026-23512. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-23512 affect?
CVE-2026-23512 affects SumatraPDF 3.5.2 and earlier (Windows). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-23512?
Update to latest SumatraPDF once patched
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local arbitrary code execution via untrusted search path; attacker could run code by placing a malicious notepad.exe in the install dir.
Patch when possible
- affected<= 3.5.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.