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CVE-2025-66019

23
FAUCET Score

CVE-2025-66019 affects pypdf, a pure-Python PDF library, prior to version 6.4.0. An attacker can craft a malicious PDF that, when parsed, leads to excessive memory consumption (up to 1 GB per stream) due to an inefficient LZWDecode filter. This vulnerability has a CVSS score of 6.6 (Medium) and is easily exploitable over the network with low attack complexity, potentially causing denial of service. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
Py-PdfPypdf
< 6.4.0CNA affected

CVSS Data

CVSS version used by this source: 4.0

6.6MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
UNREPORTED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.35%
Probability of exploitation in next 30 days
EPSS Percentile
28.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0035 is in the 17th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (36)

pippatch availablevia ghsa
Product: pypdfFixed in: 6.4.0
redhatvendor investigatingvia redhat_api
Product: OpenShift LightspeedFixed in: openshift-lightspeed/lightspeed-ocp-rag-rhel9
redhatvendor investigatingvia redhat_api
Product: OpenShift LightspeedFixed in: openshift-lightspeed/lightspeed-service-api-rhel9
redhatvendor investigatingvia redhat_api
Product: OpenShift LightspeedFixed in: openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-24/de-minimal-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-24/de-minimal-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-24/de-supported-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-24/de-supported-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-24/ee-minimal-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-24/ee-minimal-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-24/ee-supported-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-24/ee-supported-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/aap-cloud-metrics-collector-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/ansible-dev-tools-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/de-minimal-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/de-minimal-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/de-supported-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/de-supported-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/ee-cloud-services-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/ee-minimal-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/ee-minimal-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/ee-supported-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/ee-supported-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-25/lightspeed-chatbot-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-26/ansible-dev-tools-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-26/de-minimal-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-26/de-supported-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-26/ee-minimal-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-26/ee-supported-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-26/lightspeed-chatbot-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform/ee-minimal-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform/ee-minimal-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-automation-platform-tech-preview/ansible-devspaces-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux AI (RHEL AI) 3Fixed in: rhelai3/bootc-cuda-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux AI (RHEL AI) 3Fixed in: rhelai3/disk-image-cuda-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift AI (RHOAI)Fixed in: rhoai/odh-llama-stack-core-rhel9

Vendor Advisories (2)

redhatCVE-2025-66019Moderate

pypdf: pypdf manipulated LZWDecode streams can exhaust RAM

Nov 25, 2025
pipGHSA-m449-cwjh-6pw7medium

pypdf's LZWDecode streams be manipulated to exhaust RAM

Nov 24, 2025

References

aydinnyunus.github.io / 2025/12/20/cve-2025-66019-pypdf-lzw-dos
github.com / py-pdf/pypdf/commit/96186725e5e6f237129a58a97cd19204a9ce40b2
github.com / py-pdf/pypdf/releases/tag/6.4.0
github.com / py-pdf/pypdf/security/advisories/GHSA-m449-cwjh-6pw7