Skip to content
Fencer Vulns
high 7.5

CVE-2026-33699 json

pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

published 2026-03-25 7 mo ago modified 2026-11-02 6 d ago also EUVD-2026-16496 , GHSA-87mj-5ggw-8qc3 , PYSEC-2026-3012

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applying the changes from the patch manually.

Patch / fix

  • pypi pypdf 6.9.2
  • py-pdf pypdf 6.9.2
  • pypdf2_project pypdf2 6.9.2
  • pypdf_project pypdf 6.9.2
  • pypdf Debian 14 6.9.2-1

debian advisories DEBIAN-CVE-2026-33699

  • python-pypdf openSUSE Tumbleweed 6.9.2-1.1

opensuse advisories openSUSE-SU-2026:10464-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33699 updated cvss 6.5

pypdf: pypdf: Denial of Service via crafted PDF in non-strict mode

  • Red Hat Lightspeed Core lightspeed-core/rag-tool-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-service-api-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-25/lightspeed-chatbot-rhel8
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/disk-image-cuda-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift AI 2.25 rhoai/odh-llama-stack-core-rhel9 1783701598
    fixed: vendor fix RHSA-2026:42644
  • Red Hat OpenShift AI 3.3 rhoai/odh-llama-stack-core-rhel9 1782471587
    fixed: vendor fix RHSA-2026:37275
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9 Red Hat OpenShift AI 2.25 rhoai/odh-rhel9-operator 1784004914, rhoai/odh-vllm-cpu-rhel9 1782397826, rhoai/odh-dashboard-rhel9 1782826282, rhoai/odh-modelmesh-rhel9 1783443816, rhoai/odh-operator-bundle 1784005555, rhoai/odh-vllm-cuda-rhel9 1783998774, +69 more Red Hat OpenShift AI 3.3 rhoai/odh-cli-rhel9 1782471642, rhoai/rhai-cli-rhel9 1782471642, rhoai/odh-mlflow-rhel9 1782917849, rhoai/odh-trainer-rhel9 1782471656, rhoai/odh-maas-api-rhel9 1782996644, rhoai/odh-mlserver-rhel9 1782887848, +76 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 4.6 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
CNA 4.0 4.6 CVSS:4.0/AV:N/AC:L/AT:P/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
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi pypdf
<6.9.2
6.9.2

Affected products

  • py-pdf pypdf

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.