pypdf affected by possible infinite loop when reading DCT inline images without EOF marker
Priority LOW 36CWE-834Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 1 fixed, 2 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
pypdf is a free and open-source pure-python PDF library. Prior to version 6.1.3, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires parsing the content stream of a page which has an inline image using the DCTDecode filter. This has been fixed in pypdf version 6.1.3.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00444 38th percentileScored 2026-11-07
Fix Partial pypdf (py-pdf): 6.1.3pypdf (PyPI): 6.1.3Red Hat: 1 advisoryRed Hat: 1 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- 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 | pypdf | before 6.1.3 | 6.1.3 | Patch available | CNA |
| — | pypdf (PyPI) | before 6.1.3 | 6.1.3 | Patch available | GHSA-vr63-x8vc-m265 |
- pypdf Vendorpy-pdf Affected before 6.1.3 Fixed in 6.1.3 Patch available CNA
- pypdf (PyPI) Vendor— Affected before 6.1.3 Fixed in 6.1.3 Patch available GHSA-vr63-x8vc-m265
Remediation
- Fix · CNA pypdf (py-pdf) Fixed in 6.1.3
- Fix · GHSA-vr63-x8vc-m265 pypdf (PyPI) Fixed in 6.1.3 Advisory →
Red Hat 1 advisory
- RHSA-2025:23131 Released 2025-12-11 · Red Hat rating ImportantRed Hat Ansible Automation Platform 2.5 Container Release Update
- Red Hat Ansible Automation Platform 2.5 registry.redhat.io/ansible-automation-platform-25/eda-controller-rhel8, registry.redhat.io/ansible-automation-platform-25/gateway-rhel8, registry.redhat.io/ansible-automation-platform-25/lightspeed-chatbot-rhel8 +2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| OpenShift Lightspeed | Affected | No fix yet |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat Ansible Automation Platform 2.5 | Fixed | RHSA-2025:23131 |
Not affected: 2 products
- Red Hat Ansible Automation Platform 2
- Red Hat Ansible Automation Platform 2.5
Timeline
- 2026-10-02 Threatist record created from CVE-2025-62707
- 2026-10-03 Alias added: GHSA-vr63-x8vc-m265
References
Patch 2
Advisory 2
More py-pdf Pypdf vulnerabilities
- 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
Sources
- CVE-2025-62707 · CVE Program
- CVE-2025-62707 · NVD
- FIRST EPSS
- GHSA-vr63-x8vc-m265 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-62707 · Red Hat security data · CC BY 4.0
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