CVE-2026-24688
pypdf has possible Infinite Loop when processing outlines/bookmarks
Description
pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. This has been fixed in pypdf 6.6.2. If projects cannot upgrade yet, consider applying the changes from PR #3610 manually.
INFO
Published Date :
Jan. 27, 2026, 8:16 p.m.
Last Modified :
Feb. 6, 2026, 6:27 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Upgrade pypdf to version 6.6.2 or apply PR #3610 manually.
Public PoC/Exploit Available at Github
CVE-2026-24688 has a 3 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-24688.
| URL | Resource |
|---|---|
| https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1 | Patch |
| https://github.com/py-pdf/pypdf/pull/3610 | Issue Tracking |
| https://github.com/py-pdf/pypdf/releases/tag/6.6.2 | Product Release Notes |
| https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-24688 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-24688
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Mirror of https://github.com/nomi-sec/PoC-in-GitHub
CVE-2026-24688 - pypdf - DoS - POC
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-24688 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-24688 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 06, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:* versions up to (excluding) 6.6.2 Added Reference Type GitHub, Inc.: https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/py-pdf/pypdf/pull/3610 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/py-pdf/pypdf/releases/tag/6.6.2 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73 Types: Vendor Advisory -
New CVE Received by [email protected]
Jan. 27, 2026
Action Type Old Value New Value Added Description pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. This has been fixed in pypdf 6.6.2. If projects cannot upgrade yet, consider applying the changes from PR #3610 manually. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-835 Added Reference https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1 Added Reference https://github.com/py-pdf/pypdf/pull/3610 Added Reference https://github.com/py-pdf/pypdf/releases/tag/6.6.2 Added Reference https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73