CVE-2026-103000
published 2026-09-30CVE-2026-103000: pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause…
PriorityP339high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.34%
26.8th percentile
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming excessive memory and potentially making the application unavailable. This issue is fixed in version 6.19.0.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| ansible-automation-platform-25 | lightspeed-chatbot-rhel8 | — | — |
| ansible-automation-platform | automation-orchestrator-backend-rhel9 | — | — |
| lightspeed-core | lightspeed-stack-rhel9 | — | — |
| lightspeed-core | rag-tool-cpu-rhel9 | — | — |
| lightspeed-core | rag-tool-cuda-12.9-rhel9 | — | — |
| openshift-lightspeed-tech-preview | lightspeed-rag-tool-rhel9 | — | — |
| openshift-lightspeed | lightspeed-ocp-rag-rhel9 | — | — |
| py-pdf | pypdf | < 6.19.0 | 6.19.0 |
| pypdf_project | pypdf | < 6.19.0 | 6.19.0 |
| pypdf_project | pypdf | >= 0 < 6.19.0 | 6.19.0 |
| quay | quay-rhel8 | — | — |
| quay | quay-rhel9 | — | — |
| rhelai3 | bootc-cuda-rhel9 | — | — |
| rhelai3 | bootc-gaudi-rhel9 | — | — |
| rhelai3 | bootc-rocm-rhel9 | — | — |
| rhelai3 | disk-image-cuda-rhel9 | — | — |
| rhoai | odh-llama-stack-core-rhel9 | — | — |
| rhoai | odh-ogx-core-rhel9 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.08.7HIGHCVSS: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:X/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
vendor_redhat8.7HIGH
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GHSA
pypdf: Possible large memory usage when retrieving alphabetical page labels
ghsa·2026-10-01
CVE-2026-103000 [HIGH] CWE-400 pypdf: Possible large memory usage when retrieving alphabetical page labels
pypdf: Possible large memory usage when retrieving alphabetical page labels
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires accessing the page labels of a document with large alphabetical labels.
### Patches
This has been fixed in [pypdf==6.19.0](https://github.com/py-pdf/pypdf/releases/tag/6.19.0).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#4096](https://github.com/py-pdf/pypdf/pull/4096).
VulDB
py-pdf pypdf up to 6.18.x Page Labels pypdf/_page_labels.py memory allocation
vuldb·2026-09-30·CVSS 8.7
CVE-2026-103000 [HIGH] py-pdf pypdf up to 6.18.x Page Labels pypdf/_page_labels.py memory allocation
A vulnerability marked as problematic has been reported in py-pdf pypdf up to 6.18.x. The affected element is an unknown function of the file pypdf/_page_labels.py of the component Page Labels. The manipulation leads to uncontrolled memory allocation.
This vulnerability is documented as CVE-2026-103000. The attack can be initiated remotely. There is not any exploit available.
It is suggested to upgrade the affected component.
Red Hat
pypdf: pypdf: Denial of Service via large alphabetical page labels
vendor_redhat·2026-09-30·CVSS 8.7
CVE-2026-103000 [HIGH] CWE-770 pypdf: pypdf: Denial of Service via large alphabetical page labels
pypdf: pypdf: Denial of Service via large alphabetical page labels
A flaw was found in pypdf. By supplying a specially crafted PDF file containing unusually large alphabetical page-label values, a remote attacker can trigger excessive memory allocation when an application retrieves document page labels. This uncontrolled memory consumption can cause the application to crash or become unresponsive, resulting in a Denial of Service (DoS).
Package: ansible-automation-platform/automation-orchestrator-backend-rhel9 (Ansible Automation Orchestrator 2026) - Affected
Package: lightspeed-core/lightspeed-stack-rhel9 (Lightspeed Core) - Affected
Package: lightspeed-core/rag-tool-cpu-rhel9 (Lightspeed Core) - Affected
Package: lightspeed-core/rag-tool-cuda-12.9-rhel9 (Lightspeed Core) - Affected
No detection rules found.
No public exploits indexed.
2026-09-30
Published