CVE-2026-113793 pypdf: Possible infinite loop when removing tree items
Medium 6.0
Published
Updated
Check this codebase for CVE-2026-113793 and fix it if it is affected.
What it is: CVE-2026-113793 is a medium-severity vulnerability in py-pdf pypdf, published on 21 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-113793 in the wild and no public exploit code.
Affected packages and fixed versions:
- pypdf (PyPI): affected all versions; fixed in 6.20.1
- pypdf (PyPI): affected all versions; fixed in 6.20.1
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-113793/ (Markdown: https://insights.sbomify.com/CVE-2026-113793/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-113793?
CVE-2026-113793 is a medium-severity vulnerability in py-pdf pypdf, published on 21 Oct 2026.
Official description
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, removing an object from a crafted cyclic PDF tree, such as an outline item, can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.
Weakness: CWE-835
Which versions are affected by CVE-2026-113793?
2 open source packages ship an affected version, including pypdf.
| Package | Affected | Fixed in |
|---|---|---|
pypdf PyPI | All versions | 6.20.1 |
pypdf PyPI | All versions | 6.20.1 |
How do I fix CVE-2026-113793?
Upgrade pypdf to 6.20.1 or later.
Is CVE-2026-113793 being exploited?
There is no known exploitation of CVE-2026-113793 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-113793, ECHO-484f-7c3a-2ac3, GHSA-9mx8-4j7g-633p, UBUNTU-CVE-2026-113793.