# CVE-2026-107705: Poppler stack-based buffer overflow in Decrypt::revision6Hash()

Source: https://junglewise.ai/threats/cve-2026-107705-poppler-0-42-0-through-26-10-0-contains-a-stack-based-buffer  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-08. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-107705 · Severity: medium · CVSS 6.5 · Published 2026-10-08

Poppler is a PDF rendering library used by many applications to display and process PDF documents. A flaw in how it handles encrypted PDFs with long passwords allows an attacker to crash the application or potentially execute arbitrary code by supplying a specially crafted PDF with an oversized password when the file is opened.

Vendors: [Freedesktop](https://junglewise.ai/threats/vendors/freedesktop).

## Quick answers

**Is CVE-2026-107705 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-107705 being exploited in the wild.

**How severe is CVE-2026-107705?** Medium severity, with a CVSS score of 6.5, published 8 October 2026.

**Which products and versions are affected?** Freedesktop Poppler 0.42.0 through 26.10.0.

**Is there a fix for CVE-2026-107705?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-107705 attacked?** It is attacked over the network or with local access, in a software library.

**Am I affected by CVE-2026-107705?** Check whether you run Freedesktop Poppler at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in the Decrypt::revision6Hash() function when processing AESV3/R6 encrypted PDFs. An attacker can provide a password longer than 127 bytes through the libpoppler, libpoppler-glib, or C++ API to overflow the K1 and E stack buffers. This requires an attacker to control the password input and the victim to open a malicious encrypted PDF, leading to process crash or memory corruption.

## Affected products

- Freedesktop Poppler 0.42.0 through 26.10.0

## Timeline

- 2026-10-08: disclosed

## References

- [https://gitlab.freedesktop.org/poppler/poppler](https://gitlab.freedesktop.org/poppler/poppler)
- [https://gitlab.freedesktop.org/poppler/poppler/-/blob/poppler-26.10.0/poppler/Decrypt.cc](https://gitlab.freedesktop.org/poppler/poppler/-/blob/poppler-26.10.0/poppler/Decrypt.cc)