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TI-2026-82759 Aliases CVE-2026-119208GHSA-62m5-6wh8-28x7

Resource exhaustion in pypdf via forged page counts in encrypted PDFs

Priority LOW 31CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 7 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

pypdf versions before 6.21.3 are affected. When an application reads the page count of an encrypted PDF, pypdf trusts a forged /Count value in the page tree instead of walking the tree, an uncontrolled resource consumption flaw (CWE-400). An unauthenticated remote attacker can cause excessive time and memory use if a user opens a crafted encrypted PDF.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive time and memory when an application accesses the page count of a crafted encrypted PDF whose page tree declares a forged /Count value. Even after successful decryption, page-count retrieval trusts the unvalidated declared count instead of walking the page tree, allowing the attacker-controlled value to drive excessive work and memory use. This issue is fixed in version 6.21.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00221 12th percentileScored 2026-11-07
Fix Partial pypdf (py-pdf): 6.21.3pypdf (PyPI): 6.21.3Red Hat: 7 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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

VendorProductAffected versionsFixed inStatusSource
py-pdfpypdfbefore 6.21.36.21.3Patch availableCNA
—pypdf (PyPI)before 6.21.36.21.3Patch availableGHSA-62m5-6wh8-28x7
  • pypdf Vendorpy-pdf Affected before 6.21.3 Fixed in 6.21.3 Patch available CNA
  • pypdf (PyPI) Vendor— Affected before 6.21.3 Fixed in 6.21.3 Patch available GHSA-62m5-6wh8-28x7

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:*before 6.21.3Vulnerablepy-pdf
  • cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:* Versions before 6.21.3 Vulnerable ·py-pdf

Remediation

Upgrade pypdf to 6.21.3, the fixed version. Red Hat lists Ansible Automation Orchestrator 2026, Lightspeed Core, OpenShift Lightspeed, Red Hat Enterprise Linux AI (RHEL AI) 3 and Red Hat OpenShift AI (RHOAI) as affected without a fix and with no plan available, and lists Red Hat Ansible Automation Platform 2 and Red Hat Quay 3 as affected with no fix planned.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA pypdf (py-pdf) Fixed in 6.21.3
  • Fix · GHSA-62m5-6wh8-28x7 pypdf (PyPI) Fixed in 6.21.3 Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Ansible Automation Orchestrator 2026AffectedNo fix yet: Fix deferred
Lightspeed CoreAffectedNo fix yet: Fix deferred
OpenShift LightspeedAffectedNo fix yet: Fix deferred
Red Hat Ansible Automation Platform 2AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred
Red Hat Quay 3AffectedNo fix planned: Out of support scope

Timeline

  1. 2026-10-29 Threatist record created from CVE-2026-119208
  2. 2026-10-30 Affected versions changed · Red Hat
  3. 2026-10-30 CVSS score added · Red Hat
  4. 2026-10-30 Alias added: GHSA-62m5-6wh8-28x7
  5. 2026-10-30 Fix available: PyPI/[email protected] · GHSA-62m5-6wh8-28x7
  6. 2026-10-30 CVSS score added · GHSA-62m5-6wh8-28x7
  7. 2026-10-30 Weakness changed · GHSA-62m5-6wh8-28x7
  8. 2026-10-30 6 new references · GHSA-62m5-6wh8-28x7
  9. 2026-10-31 Priority changed: MEDIUM → LOW
  10. 2026-11-02 CVSS score added · NVD
  11. 2026-11-04 CISA SSVC decision points changed

References

Patch 3

Advisory 1

Other 2

  • 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
  • TI-2026-65556 pypdf: Possible long runtimes with large amount of embedded files CVSS 4.0HIGH 8.7
See all 65 →

Sources

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