CVE-2026-115580

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF with a standard cross-reference table whose declared entry count exceeds what the file can contain, causing excessive processing and long runtimes when the file is opened. This issue is fixed in version 6.21.2.

Is your site exposed to CVE-2026-115580?

Run a free security scan — no signup, results in seconds.

Weakness Type (CWE)

CWE-834 CWE-834

References

Other References

https://github.com/py-pdf/pypdf/commit/a3061e34b169d34478d520f5f049c53cfb1482b2 https://github.com/py-pdf/pypdf/pull/4239 https://github.com/py-pdf/pypdf/releases/tag/6.21.2 https://github.com/py-pdf/pypdf/security/advisories/GHSA-gmh7-3g9r-mjh5

Frequently Asked Questions

What is CVE-2026-115580? +

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF with a standard cross-reference table whose declared entry count exceeds what the file can contain, causing excessive processing and long runtimes when the file is opened. This issue is fixed in version 6.21.2.

How do I check if I'm vulnerable to CVE-2026-115580? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-91137

Improper validation of specified quantity in input, Allocation of resources without limits or throttling, Excessive Iteration vulnerability in Apache Thrift …

CVE-2026-87721

Uncontrolled Resource Consumption (CWE-400 / CWE-407) in the ANTLR 3 search query parser (QueryParser / Query.g) in Gerrit Code Review …

CVE-2026-81872

OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to version 0.21.0, the go.opentelemetry.io/otel/sdk/log BatchingProcessor can enter a tight CPU loop …

CVE-2026-59644

In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary 32-bit generation counter from sender.

CVE-2026-53493

containerd is an open-source container runtime. Prior to versions 1.7.36, 2.0.13, 2.2.9, 2.3.6, and 2.4.1, a crafted OCI index graph …

CVE-2026-77357

Mesop is a Python-based UI framework that allows users to build web applications. Prior to 1.3.3, applications running in debug …