CVE-2026-59936
Malformed PDF causes infinite loop in pypdf text extraction leading to DoS
Is CVE-2026-59936 being exploited?
Not confirmed. CVE-2026-59936 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 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-59936?
CVE-2026-59936 is rated High with a CVSS score of 8.7. 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-2026-59936?
Yes. A fix has been recorded for CVE-2026-59936. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-59936 affect?
CVE-2026-59936 affects pypdf < 6.14.1, Python applications using pypdf, PDF text extraction/indexing services. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-59936?
Upgrade pypdf to >=6.14.1; sandbox and limit PDF processing
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Denial-of-service: crafted PDF with unterminated inline image triggers infinite loop during text extraction, causing CPU hang/process/resource exhaustion.
Patch when possible
- affected< 6.14.1
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.