CVE-2026-113789 pypdf: Possible long runtimes/large memory usage when retrieving form fields
Medium 6.0
Published
Updated
Check this codebase for CVE-2026-113789 and fix it if it is affected.
What it is: CVE-2026-113789 is a medium-severity vulnerability in py-pdf pypdf, published on 21 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-113789 in the wild and no public exploit code.
Affected packages and fixed versions:
- pypdf (PyPI): affected all versions; fixed in 6.21.0
- pypdf (PyPI): affected all versions; fixed in 6.21.0
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-2026-113789/ (Markdown: https://insights.sbomify.com/CVE-2026-113789/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-113789?
CVE-2026-113789 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 6.21.0, 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.
Which versions are affected by CVE-2026-113789?
2 open source packages ship an affected version, including pypdf.
| Package | Affected | Fixed in |
|---|---|---|
pypdf PyPI | All versions | 6.21.0 |
pypdf PyPI | All versions | 6.21.0 |
How do I fix CVE-2026-113789?
Upgrade pypdf to 6.21.0 or later.
Is CVE-2026-113789 being exploited?
There is no known exploitation of CVE-2026-113789 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-113789, ECHO-ed1a-8ea8-27ba, GHSA-6vvc-x485-93v7, UBUNTU-CVE-2026-113789.