How serious is CVE-2026-28804?

This vulnerability has a CVSS score of 6.9 out of 10, classified as MEDIUM severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-28804?

Yes, proof-of-concept exploit code for CVE-2026-28804 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-28804?

CVE-2026-28804 affects pypdf project pypdf. Check the full CVE details for specific version information.

How do I fix CVE-2026-28804?

To remediate CVE-2026-28804, check for security patches from pypdf project. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-28804

Medium

|6.9

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

An attacker can create a specially crafted PDF that causes the pypdf library to run for an excessively long time, potentially leading to denial of service. This issue occurs when the PDF uses a specific decoding method and affects versions prior to 6.7.5, which has since been patched.

Technical Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Confidentiality ImpactHigh

Integrity ImpactHigh

Availability ImpactHigh

ScopeChanged

Vector String

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$1,000($500-$1K)

Vendor Response

Grade APatched in 4 days

Quick Information

Published

Mar 6, 2026

about 1 month ago

Last Modified

Mar 10, 2026

28 days ago

Vendor

pypdf project

Product

pypdf