CVE-2023-36810

What it is

pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. An attacker who uses this vulnerability can craft a PDF which leads to unexpected long runtime. This quadratic runtime blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. This issue has been addressed in PR 808 and versions from 1.27.9 include this fix. Users are advised to upgrade. There are no known workarounds for this vulnerability.

At a glance

Exploitability

Can be exploited locally on the machine without logging in. High risk of service disruption.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2023-06-30 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-11-02 16:06 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.6% in the next 30 days (EPSS).
• Severity: 6.2 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-06-30 19:15 UTC

Last modified

2026-11-02 16:06 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-407

Record status

Modified

Affected

• py-pdf Pypdf ≤ 1.27.8

Attack profile CVSS 3.1 · 6.2

Attack vector

Local

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-36810.md and follow it. Check whether this project is affected by CVE-2023-36810. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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