High [CVE-2026-55379] Denial of Service via crafted BDF font file
This high-severity Red Hat Linux advisory covers CVE-2026-55379 affecting Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 9.
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Summary
Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillow's documented decompression bomb protection and allowing excessive memory allocation.
This issue is fixed in version 12.3.0. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by providing a specially crafted BDF font file.
The library's image processing function fails to properly validate dimensions from the font file, bypassing a critical security check designed to prevent excessive memory usage. This oversight can lead to the system consuming an unreasonable amount of memory, making it unavailable to legitimate users.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.
Affected products named by the advisory: Red Hat Ansible Automation Platform 2.5 for RHEL 8; Red Hat Ansible Automation Platform 2.5 for RHEL 9; Red Hat Ansible Automation Platform 2.6 for RHEL 9; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 28 more.
- < 12.3.0
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 12.3.0
- python3.12-pillow-0:12.3.0-1.el8ap
- python3.12-pillow-0:12.3.0-1.el9ap
- python-pillow-0:5.1.1-22.el8_10
- python-pillow-0:5.1.1-15.el8_4.2
- python-pillow-0:5.1.1-20.el8_6
- python-pillow-0:5.1.1-20.el8_8
- python-pillow-0:12.3.0-1.el8pc
- python-pillow-0:12.3.0-1.el9pc
- python3.12-pillow-0:12.3.0-1.el9pc
- rhaiis/vllm-cuda-rhel9:1787860580
- rhaiis/model-opt-cuda-rhel9:1787772157
- rhaiis/vllm-rocm-rhel9:1787884873
- rhaiis/model-opt-cuda-rhel9:1787601159
- rhaii/vllm-spyre-rhel9:1789681201
- rhaii/vllm-cpu-rhel9:1789681128
- rhaii/vllm-cuda-rhel9:1789681126
- rhaii/model-opt-cuda-rhel9:1789681126
- rhaii/vllm-rocm-rhel9:1789681126
- ansible-automation-platform-25/hub-rhel8:1785376274
- ansible-automation-platform-26/hub-rhel9:1785753568
- ansible-automation-platform-26/lightspeed-chatbot-rhel9:1785646188
- ansible-automation-platform-27/hub-rhel9:1785376164
- ansible-automation-platform-27/lightspeed-chatbot-rhel9:1785426734
- rhelai3/disk-image-cuda-rhel9:1788290314
- rhelai3/bootc-aws-cuda-rhel9:1788273908
- rhelai3/bootc-azure-cuda-rhel9:1788273909
- rhelai3/bootc-cuda-rhel9:1788260684
- rhelai3/bootc-gcp-cuda-rhel9:1788273977
- rhoai/odh-automl-rhel9:1786612415
- rhoai/odh-autorag-rhel9:1786612637
- rhoai/odh-llama-stack-core-rhel9:1786635926
- rhoai/odh-llm-d-kv-cache-rhel9:1787169432
- rhoai/odh-openvino-model-server-rhel9:1787303251
- rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9:1787073866
- rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9:1787073873
- rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9:1787073459
- rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9:1787073611
- rhoai/odh-pipeline-runtime-tensorflow-cuda-py312-rhel9:1787073451
- rhoai/odh-pipeline-runtime-tensorflow-rocm-py312-rhel9:1787073451
- rhoai/odh-th06-cpu-torch210-py312-rhel9:1787076778
- RHSA-2026:50319
- RHSA-2026:50336
- RHSA-2026:39127
- RHSA-2026:52551
- RHSA-2026:48760
- RHSA-2026:48759
- RHSA-2026:50223
- RHSA-2026:50222
- RHSA-2026:50263
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- Do not load BDF font files from untrusted sources. Applications that only process standard image formats (PNG, JPEG, etc.) and do not use BdfFontFile or ImageFont.load() with BDF files are not affected.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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