Medium [CVE-2026-59937] Denial of Service via crafted PDF with malformed cross-reference streams
This medium-severity Red Hat Linux advisory covers CVE-2026-59937 affecting Exploit Intelligence, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2.
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries.
This issue is fixed in version 6.14.0. A remote attacker could exploit this vulnerability by crafting a malicious PDF file containing repeated malformed cross-reference streams.
This could cause the pypdf library to spend excessive time recovering broken cross-reference table entries, leading to a denial of service (DoS) condition for applications processing such files. An attacker could exploit this by providing a specially crafted PDF with malformed cross-reference streams, causing significantly extended processing time.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-1050.
Affected Red Hat products: Exploit Intelligence; OpenShift Lightspeed; Red Hat Ansible Automation Platform 2; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI); Red Hat Quay 3. Red Hat does not currently list a fixing RHSA for this CVE.
- < 6.14.0
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation
Upgrade to a fixed release: 6.14.0. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.