pypdf: Possible long runtimes when generating appearance streams

ImpactAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires updating form field values with flattening enabled, which triggers appearance stream generation. PatchesThis has been fixed in pypdf==6.19.0. WorkaroundsIf you cannot upgrade yet, consider...

EUVD-2026-90384

pypdf: Possible long runtimes when generating appearance streams...

CVE-2026-102998

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/appearancestream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled,...

CVE-2026-102998 pypdf: Possible long runtimes when generating appearance streams

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/appearancestream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled,...

CVE-2026-102998

The pypdf pure-python PDF library is vulnerable to excessive runtimes in versions prior to 6.19.0 . A crafted PDF containing specific form field values can trigger a loop in pypdf/generic/_appearance_stream.py that repeats invariant selection-data work during appearance-stream generation, particu...

CVE-2026-102998

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/appearancestream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled,...

CVE-2026-102998 pypdf: Possible long runtimes when generating appearance streams

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/appearancestream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled,...