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CVE-2023-36464

17
FAUCET Score

CVE-2023-36464 is a denial-of-service vulnerability affecting pypdf, pypdf2, and pypdf_project libraries, where a specially crafted PDF can trigger an infinite loop during text extraction. This local vulnerability has a medium severity CVSS score of 5.5, requiring user interaction to process the malicious PDF, leading to high availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.9.0CPE matchmatch criteria
cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*
>= 2.2.0CPE matchmatch criteria
cpe:2.3:a:pypdf2_project:pypdf2:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.2MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.5
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.35%
Probability of exploitation in next 30 days
EPSS Percentile
27.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0035 is in the 35th percentile among its peer group of 5,765 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: pypdfFixed in: 3.9.0
redhatno patchvia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-rhel8

Vendor Advisories (2)

pipGHSA-4vvm-4w3v-6mr8medium

pypdf and PyPDF2 possible Infinite Loop when a comment isn't followed by a character

Jun 30, 2023
redhatCVE-2023-36464Moderate

pypdf: Possible Infinite Loop when a comment isn't followed by a character

Jun 28, 2023

References

github.com / py-pdf/pypdf/pull/1828
Patch
github.com / py-pdf/pypdf/pull/969
Issue TrackingPatch
github.com / py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8
ExploitPatch