A flaw was found in pypdf. A remote attacker can exploit this issue by submitting a specially crafted PDF document with specific form field values. When an application updates these fields with flattening enabled, redundant computational operations are repeated inside a loop during appearance stream generation. This excessive workload consumes processing resources, leading to application unresponsiveness and a Denial of Service (DoS).
Last checked: 2026-10-05 16:33 UTC
No exploitation evidence · CISA Coordinator (Assessed 2026-09-30 20:49 UTC)
Fix evidence last checked: 2026-10-10 18:48 UTC
Debian 12 (Bookworm)
Debian Security Tracker · Observed 2026-10-10