CVE-2026-82398

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, an attacker can craft a PDF that causes long runtimes when the pypdf/_utils.py function read_until_whitespace reads a stream containing a long run of bytes without whitespace. The function repeatedly performs immutable bytes concatenation in a one-byte loop, causing quadratic processing cost for the long non-whitespace input. This issue is fixed in version 6.15.0.

• CWE-407

• https://github.com/py-pdf/pypdf/commit/4959848e057e37c218dccad7465259210923faaaPatch
• https://github.com/py-pdf/pypdf/pull/3947Patch
• https://github.com/py-pdf/pypdf/releases/tag/6.15.0Release Notes
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-fc8x-2rww-xw9mPatch, Vendor Advisory

Published

Aug 31, 2026

Last Modified

Nov 2, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-82392pnpm is a package manager. Prior to 10.34.5 and from 11.0.0 …7.1
• CVE-2026-82393pnpm is a package manager. Prior to 10.34.5 and 11.11.0, pnp…7.5
• CVE-2026-82394Sulu is an open-source PHP content management system based o…5.3
• CVE-2026-82395Sulu is an open-source PHP content management system based o…5.3
• CVE-2026-82396Sulu is an open-source PHP content management system based o…5.4
• CVE-2026-82397Tornado is a Python web framework and asynchronous networkin…7.5
• CVE-2026-82399CoreDNS is a DNS server written in Go. Prior to 1.14.7, the …7.5
• CVE-2026-8240Concrete CMS 9.5.0 and below is vulnerable to unauthenticate…5.3
• CVE-2026-82402Gogs is an open source self-hosted Git service. Prior to 0.1…5.3
• CVE-2026-82404TOON is a compact, human-readable serialization of JSON data…8.3
• CVE-2026-82405Klever-Go is the Go implementation of the Klever blockchain …8.7
• CVE-2026-82406Klever-Go is the Go implementation of the Klever blockchain …7.1