CVE-2023-36810

Name: CVE-2023-36810
Creator: NVD / NIST
Published: 2023-06-30T19:15:09.357+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2023-36810 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

0.57%

42.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-407

Affected Software

Vendor	Product	Versions
Pypdf Project	Pypdf	<= 1.27.8

References

https://github.com/py-pdf/pypdf/issues/582Exploit, Issue Tracking, Vendor Advisory
https://github.com/py-pdf/pypdf/pull/808Patch
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jrm6-h9cq-8gqwExploit, Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00019.html
https://github.com/py-pdf/pypdf/issues/582Exploit, Issue Tracking, Vendor Advisory
https://github.com/py-pdf/pypdf/pull/808Patch
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jrm6-h9cq-8gqwExploit, Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00019.html

Timeline

Published: Jun 30, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-36810?

How severe is CVE-2023-36810?

CVE-2023-36810 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2023-36810?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-36810?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST