CVE-2026-102998
published 2026-09-30CVE-2026-102998: pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py…
PriorityP340high7.5CVSS 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 with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, resulting in excessive runtimes and application unavailability. 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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Red Hat
pypdf: pypdf: Denial of Service via crafted PDF form fields
vendor_redhat·2026-09-30·CVSS 8.7
CVE-2026-102998 [HIGH] CWE-606 pypdf: pypdf: Denial of Service via crafted PDF form fields
pypdf: pypdf: Denial of Service via crafted PDF form fields
A flaw was found in pypdf. A remote attacker can exploit this issue by submitting a specially crafted PDF document with specific form field values. When an application updates these fields with flattening enabled, redundant computational operations are repeated inside a loop during appearance stream generation. This excessive workload consumes processing resources, leading to application unresponsiveness and 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-c
GHSA
pypdf: Possible long runtimes when generating appearance streams
ghsa·2026-10-01
CVE-2026-102998 [HIGH] CWE-400 pypdf: Possible long runtimes when generating appearance streams
pypdf: Possible long runtimes when generating appearance streams
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires updating form field values with flattening enabled, which triggers appearance stream generation.
### 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 [#4087](https://github.com/py-pdf/pypdf/pull/4087).
VulDB
py-pdf Pypdf up to 6.18.x Appearance Stream _appearance_stream.py infinite loop
vuldb·2026-09-30·CVSS 8.7
CVE-2026-102998 [HIGH] py-pdf Pypdf up to 6.18.x Appearance Stream _appearance_stream.py infinite loop
A vulnerability labeled as problematic has been found in py-pdf Pypdf up to 6.18.x. Impacted is an unknown function of the file pypdf/generic/_appearance_stream.py of the component Appearance Stream. Executing a manipulation can lead to infinite loop.
This vulnerability is registered as CVE-2026-102998. It is possible to launch the attack remotely. No exploit is available.
The affected component should be upgraded.
No detection rules found.
No public exploits indexed.
2026-09-30
Published