Medium5.5Red Hat Linux

Medium [CVE-2026-49460] Denial of Service via crafted PDF with FlateDecode filter

This medium-severity Red Hat Linux advisory covers CVE-2026-49460.

CVE-2026-49460 Published Jun 22, 2026Updated by vendor Jun 22, 2026

CVE-2026-49460

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes.

This requires accessing a stream which uses the /FlateDecode filter with a PNG predictor. This vulnerability is fixed in 6.12.2.

A flaw was found in pypdf (before 6.12.2). pypdf is vulnerable to denial of service when parsing a crafted PDF containing a /FlateDecode stream with a PNG predictor. An attacker who can supply such a document for processing may cause the application to hang on long runtimes.

Red Hat exposure is in Python services that use pypdf for PDF ingestion, including Quay, OpenShift logging/observability tooling, and other containerized apps that bundle the library for document handling. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).

Weakness: CWE-770. Red Hat lists 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 as not affected.

Affected versions

< 6.12.2

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Fixed versions

6.12.2

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Mitigation

Upgrade to a fixed release: 6.12.2. 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 15 days ago·verify at source

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