Pillow is a Python imaging library. From 5.1.0 until 12.3.0, PdfParser.PdfStream.decode() in PIL/PdfParser.py calls zlib.decompress() with bufsize set to the PDF stream Length field without bounding the decompressed output size, allowing a crafted FlateDecode PDF stream to exhaust memory from a small file. This issue is fixed in version 12.3.0.

A flaw was found in Pillow, a Python imaging library. A remote attacker could exploit a vulnerability in the PdfParser.PdfStream.decode() function when processing a crafted FlateDecode PDF stream. By providing a specially designed PDF file, the attacker could cause the application to exhaust available memory, leading to a denial of service (DoS).

The impact is limited to denial of service via memory exhaustion. A small crafted PDF input can force unbounded decompression, but this does not lead to code execution or information disclosure. Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Red Hat Quay 3.15 2026-07-30T00:00:00Z RHSA-2026:48933 quay/quay-rhel8:1785261506 Red Hat Quay 3.9 2026-08-05T00:00:00Z RHSA-2026:50931 quay/quay-rhel8:1785950004 Exploit Intelligence Under investigation exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Lightspeed Core Affected lightspeed-core/lightspeed-stack-rhel9 Lightspeed Core Affected lightspeed-core/rag-tool-cpu-rhel9 Lightspeed Core Affected lightspeed-core/rag-tool-cuda-12.9-rhel9 OpenShift Lightspeed Not affected openshift-lightspeed/lightspeed-ocp-rag-rhel9 OpenShift Lightspeed Affected openshift-lightspeed/lightspeed-service-api-rhel9 OpenShift Lightspeed Not affected openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9 Red Hat AI Inference Server Affected rhaii/model-opt-cuda-rhel9 Red Hat AI Inference Server Affected rhaiis/model-opt-cuda-rhel9 Red Hat AI Inference Server Will not fix rhaiis/vllm-cpu-rhel9 Red Hat AI Inference Server Affected rhaiis/vllm-cuda-rhel9 Red Hat AI Inference Server Will not fix rhaiis/vllm-neuron-rhel9 Red Hat AI Inference Server Affected rhaiis/vllm-rocm-rhel9 Red Hat AI Inference Server Affected rhaiis/vllm-spyre-rhel9 Red Hat AI Inference Server Will not fix rhaiis/vllm-tpu-rhel9 Red Hat AI Inference Server Affected rhaii/vllm-cpu-rhel9 Red Hat AI Inference Server Affected rhaii/vllm-cuda-rhel9 Red Hat AI Inference Server Will not fix rhaii/vllm-gaudi-rhel9 Red Hat AI Inference Server Will not fix rhaii/vllm-neuron-rhel9 Red Hat AI Inference Server Affected rhaii/vllm-rocm-rhel9 Red Hat AI Inference Server Affected rhaii/vllm-spyre-rhel9 Red Hat AI Inference Server Will not fix rhaii/vllm-tpu-rhel9 Red Hat Ansible Automation Platform 2 Under investigation ansible-automation-platform-25/lightspeed-chatbot-rhel8 Red Hat Ansible Automation Platform 2 Under investigation ansible-automation-platform-26/hub-rhel9 Red Hat Ansible Automation Platform 2 Under investigation ansible-automation-platform-26/lightspeed-chatbot-rhel9 Red Hat Ansible Automation Platform 2 Under investigation ansible-automation-platform-27/hub-rhel9 Red Hat Ansible Automation Platform 2 Under investigation ansible-automation-platform-27/lightspeed-chatbot-rhel9 Red Hat Ansible Automation Platform 2 Under investigation ansible-automation-platform/automation-dashboard-rhel9 Red Hat Ansible Automation Platform 2 Under investigation python-pillow Red Hat Enterprise Linux 7 Under investigation python-pillow Red Hat Enterprise Linux 8 Under investigation python-pillow Red Hat Enterprise Linux AI (RHEL AI) 3 Affected rhelai3/bootc-aws-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Affected rhelai3/bootc-azure-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Affected rhelai3/bootc-azure-rocm-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Affected rhelai3/bootc-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Affected rhelai3/bootc-gaudi-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Affected rhelai3/bootc-gcp-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Affected rhelai3/bootc-rocm-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Affected rhelai3/disk-image-cuda-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-automl-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-autorag-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-caikit-nlp-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-caikit-tgis-serving-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-kserve-agent-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-kserve-autogluon-server-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-kserve-controller-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-kserve-router-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-kserve-storage-initializer-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-llama-stack-core-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-llm-d-inference-scheduler-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-llm-d-kv-cache-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-mlflow-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-openvino-model-server-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-pipeline-runtime-tensorflow-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-pipeline-runtime-tensorflow-rocm-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-th06-cpu-torch210-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-th06-cpu-torch291-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-th06-cuda130-torch210-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-th06-cuda130-torch291-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-th06-rocm64-torch291-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-training-cuda128-torch29-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-training-rocm64-torch29-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-trustyai-nemo-guardrails-server-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-vllm-gaudi-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-workbench-jupyter-datascience-cpu-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-workbench-jupyter-tensorflow-rocm-py312-rhel9 Red Hat OpenShift AI (RHOAI) Affected rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9 Red Hat Quay 3 Affected quay/quay-rhel9 Red Hat Satellite 6 Under investigation python-pillow Red Hat Satellite 6 Under investigation satellite:el8/python-pillow https://www.cve.org/CVERecord?id=CVE-2026-59200 https://nvd.nist.gov/vuln/detail/CVE-2026-59200 https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09 https://github.com/python-pillow/Pillow/pull/9718 https://github.com/python-pillow/Pillow/releases/tag/12.3.0 https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565