TI-2026-65556 Aliases CVE-2026-102999 GHSA-v247-6f48-mgcj

pypdf: Possible long runtimes with large amount of embedded files

MEDIUM 44CWE-400Published 2026-09-30 · Updated 2026-10-01

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 5 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 is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files can cause the dictionary-based attachments API in pypdf/_doc_common.py to reparse the full attachment list for each content lookup, producing repeated work and long runtimes when an application accesses the embedded-file mapping. This issue is fixed in version 6.19.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00348 28th percentileScored 2026-11-07

Fix Partial pypdf (py-pdf): 6.19.0pypdf (PyPI): 6.19.0Red Hat: 5 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 6.19.0	6.19.0	Patch available	CNA
—	pypdf (PyPI)	before 6.19.0	6.19.0	Patch available	GHSA-v247-6f48-mgcj

pypdf Vendorpy-pdf Affected before 6.19.0 Fixed in 6.19.0 Patch available CNA
pypdf (PyPI) Vendor— Affected before 6.19.0 Fixed in 6.19.0 Patch available GHSA-v247-6f48-mgcj

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:py-pdf:pypdf::::::::	before 6.19.0	Vulnerable	py-pdf

cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:* Versions before 6.19.0 Vulnerable ·py-pdf

Remediation

Fix · CNA pypdf (py-pdf) Fixed in 6.19.0
Fix · GHSA-v247-6f48-mgcj pypdf (PyPI) Fixed in 6.19.0 Advisory →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Lightspeed Core	Affected	No fix yet
Red Hat Ansible Automation Platform 2	Affected	No fix planned: Will not fix
Red Hat Enterprise Linux AI (RHEL AI) 3	Affected	No fix yet
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet
Red Hat Quay 3	Affected	No fix yet

Not affected: 2 products

Ansible Automation Orchestrator 2026
OpenShift Lightspeed

Timeline

2026-10-02 Threatist record created from CVE-2026-102999
2026-10-03 Alias added: GHSA-v247-6f48-mgcj
2026-10-05 CVSS score added · NVD

References

Patch 2

Advisory 2

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-2026-65555 pypdf: Possible long runtimes when generating appearance streams 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