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CVE-2026-113789medium6.0

pypdf: Possible long runtimes/large memory usage when retrieving form fields

Impact

pypdf versions prior to 6.21.0 may experience large memory usage or long runtimes when retrieving form fields from a crafted PDF. An attacker can cause this issue. The weakness is related to uncontrolled resource consumption and inefficient algorithmic complexity.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

py-pdf · GitHub_M

pypdf

1 range
GitHub_M version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

< 6.21.0

unaffected

unknown

Other versions: unknown

Original source description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF that causes large memory usage or long runtimes when an application retrieves the document's form fields. This issue is fixed in version 6.21.0.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-113789

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

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Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-400 ↗

CWE-400: Uncontrolled Resource Consumption

GitHub_M

Related →
CWE-407 ↗

CWE-407: Inefficient Algorithmic Complexity

GitHub_M

Related →
Contributing organizations · 2
GitHub_M

Assigning organization

2026-10-21
CISA-ADP

Additional data publisher

2026-10-28

What changed

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References

4 sources
github.com/py-pdf/pypdf/security/advisories/GHSA-6vvc-x485-93v7
Security advisoryGitHub_M
github.com/py-pdf/pypdf/pull/4219
PatchGitHub_M
github.com/py-pdf/pypdf/commit/5ef728f0e16d225c853e89f861ba0a67402fe3f2
PatchGitHub_M
github.com/py-pdf/pypdf/releases/tag/6.21.0
Release notesGitHub_M