TI-2022-08670 Aliases CVE-2022-24859 GHSA-xcjx-m2pj-8g79

Manipulated inline images can cause Infinite Loop in PyPDF2

MEDIUM 61CWE-835Published 2022-04-18 · Updated 2025-04-22

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-835.

Summary

PyPDF2 is an open source python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. In versions prior to 1.27.5 an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop if the PyPDF2 if the code attempts to get the content stream. The reason is that the last while-loop in `ContentStream._readInlineImage` only terminates when it finds the `EI` token, but never actually checks if the stream has already ended. This issue has been resolved in version `1.27.5`. Users unable to upgrade should validate and PDFs prior to iterating over their content stream.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01328 71st percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix Partial PyPDF2 (py-pdf): 1.27.5PyPDF2 (PyPI): 1.27.5Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
py-pdf	PyPDF2	before 1.27.5	1.27.5	Patch available	CNA
—	PyPDF2 (PyPI)	before 1.27.5	1.27.5	Patch available	GHSA-xcjx-m2pj-8g79

PyPDF2 Vendorpy-pdf Affected before 1.27.5 Fixed in 1.27.5 Patch available CNA
PyPDF2 (PyPI) Vendor— Affected before 1.27.5 Fixed in 1.27.5 Patch available GHSA-xcjx-m2pj-8g79

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:pypdf2_project:pypdf2::::::::	before 1.27.5	Vulnerable	Pypdf2 Project
cpe:2.3:o:debian:debian_linux:9.0:::::::*	9.0	Vulnerable	Debian

cpe:2.3:a:pypdf2_project:pypdf2:*:*:*:*:*:*:*:* Versions before 1.27.5 Vulnerable ·Pypdf2 Project
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian

Remediation

Fix · CNA PyPDF2 (py-pdf) Fixed in 1.27.5
Fix · GHSA-xcjx-m2pj-8g79 PyPDF2 (PyPI) Fixed in 1.27.5 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Quay 3	Affected	No fix yet

Timeline

2026-10-02 Threatist record created from CVE-2022-24859
2026-10-03 Alias added: GHSA-xcjx-m2pj-8g79

References

Exploit 2

Patch 1

https://github.com/py-pdf/PyPDF2/pull/740

Advisory 3

Other 3

TI-2026-79334 Exponential SVG use expansion exhausts CPU and memory in fpdf2 CVSS 3.1MEDIUM 6.5
TI-2023-18601 Infinite Loop when reading malformed objects in pypdf CVSS 3.1MEDIUM 6.5
TI-2023-18305 Infinite Loop when a comment isn't followed by a character in pypdf CVSS 3.1MEDIUM 6.2
TI-2026-42743 pypdf: Possible infinite loop for not terminated inline images CVSS 4.0HIGH 8.7
TI-2026-42742 pypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter) CVSS 4.0HIGH 8.7
TI-2026-65557 pypdf: Possible large memory usage when retrieving alphabetical page labels CVSS 4.0HIGH 8.7

See all 73 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences