Aziz Elbelaychy

**Name of the Vulnerable Software and Affected Versions** Poppler versions 0.42.0 through 26.10.0 **Description** A stack-based buffer overflow exists in the `Decrypt::revision6Hash()` function. This occurs when opening PDFs encrypted with AESV3/R6 if a password longer than 127 bytes is provided. Attackers can use applications utilizing the libpoppler, libpoppler-glib, or C++ API to overflow the `K1` and `E` buffers, which may lead to process crashes or memory corruption. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.