--- id: CVE-2026-42308 title: >- Pillow: Pillow: Denial of Service via integer overflow in font processing (CVE-2026-42308) summary: >- A flaw was found in Pillow, a Python imaging library. If a font advances for each glyph by an exceeding large amount, an integer overflow can occur when Pillow tracks the current position. This could lead to a denial of service (DoS) condi… severity: medium cvss: 6.2 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cvssSource: vendor cwe: CWE-190 vendor: Red Hat product: Red Hat Enterprise Linux 8 affected: - exploit_intelligence - openshift_lightspeed - pen_drive_powered_by_red_hat_lightspeed - ai_inference_server - ansible_automation_platform 2 - enterprise_linux 10 - enterprise_linux 6 - enterprise_linux 7 - enterprise_linux 8 - enterprise_linux 9 - enterprise_linux_ai_rhel_ai 3 - openshift_ai_rhoai - openshift_dev_spaces - quay 3 - satellite 6 - ai_inference_server 3.3 - ai_inference_server 3.4 patched: - ai_inference_server 3.3 - ai_inference_server 3.4 published: '2026-05-09' updated: '2026-09-18' sourceUpdated: '2026-09-18T18:31:50+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42308.json' references: - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42308.json - url: 'https://access.redhat.com/security/cve/CVE-2026-42308' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2468457' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-42308' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42308' - url: 'https://github.com/python-pillow/Pillow/releases/tag/12.2.0' - url: >- https://github.com/python-pillow/Pillow/security/advisories/GHSA-wjx4-4jcj-g98j - url: 'https://access.redhat.com/errata/RHSA-2026:16008' - url: 'https://access.redhat.com/errata/RHSA-2026:16030' - url: 'https://access.redhat.com/errata/RHSA-2026:16009' - url: 'https://access.redhat.com/errata/RHSA-2026:57387' - url: >- https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2026-165.yaml - url: 'https://github.com/python-pillow/Pillow' tags: - csaf - vex - red-hat - osv - pip epss: 0.00159 epssPercentile: 0.04244 aliases: - GHSA-wjx4-4jcj-g98j - BIT-pillow-2026-42308 - PYSEC-2026-165 ecosystem: pip scores: vendor: 6.2 osv: 5.5 ingestedAt: '2026-09-12T03:13:01.736Z' --- ## Overview A flaw was found in Pillow, a Python imaging library. If a font advances for each glyph by an exceeding large amount, an integer overflow can occur when Pillow tracks the current position. This could lead to a denial of service (DoS) condition, making the application unavailable. ## Vendor advisories - **RHSA-2026:16008** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-05-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:16008) - **RHSA-2026:16030** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-05-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:16030) - **RHSA-2026:16009** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-05-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:16009) - **RHSA-2026:57387** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:57387) - **Red Hat VEX** · Moderate · affected: Exploit Intelligence, OpenShift Lightspeed, Pen Drive Powered by Red Hat Lightspeed, Red Hat AI Inference Server, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux 10, … · no fix planned: Red Hat Enterprise Linux 9, Exploit Intelligence, OpenShift Lightspeed, Pen Drive Powered by Red Hat Lightspeed, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42308.json) **Pillow: Pillow: Denial of Service via integer overflow in font processing** — rated Moderate by Red Hat. Released 2026-05-09, updated 2026-09-18. Affected: - Exploit Intelligence - OpenShift Lightspeed - Pen Drive Powered by Red Hat Lightspeed - Red Hat AI Inference Server - Red Hat Ansible Automation Platform 2 - Red Hat Enterprise Linux 10 - Red Hat Enterprise Linux 6 - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 8 - Red Hat Enterprise Linux 9 - Red Hat Enterprise Linux AI (RHEL AI) 3 - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Dev Spaces - Red Hat Quay 3 - Red Hat Satellite 6 Fixed: - Red Hat AI Inference Server 3.3 - Red Hat AI Inference Server 3.4 No fix planned: - Red Hat Enterprise Linux 9 - Exploit Intelligence - OpenShift Lightspeed - Pen Drive Powered by Red Hat Lightspeed - Red Hat AI Inference Server - Red Hat Ansible Automation Platform 2 - Red Hat Enterprise Linux 10 - Red Hat Enterprise Linux 6 - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 8 - Red Hat Enterprise Linux AI (RHEL AI) 3 - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Dev Spaces - Red Hat Quay 3 - Red Hat Satellite 6 ## Remediation For more information visit https://access.redhat.com/errata/RHSA-2026:16008 https://access.redhat.com/errata/RHSA-2026:16008 For more information visit https://access.redhat.com/errata/RHSA-2026:16030 https://access.redhat.com/errata/RHSA-2026:16030 For more information visit https://access.redhat.com/errata/RHSA-2026:16009 https://access.redhat.com/errata/RHSA-2026:16009 Workarounds / mitigations: - To mitigate this issue, ensure that applications utilizing the Pillow library do not process untrusted or maliciously crafted font files. Additionally, consider running applications that process image data in a sandboxed environment to limit potential impact. Reloading or restarting affected services may be required for changes to take effect. ## Package advisory (CVE-2026-42308) Affected packages: - `pillow < 12.2.0` Patched in: - `pillow 12.2.0` Source: https://osv.dev/vulnerability/GHSA-wjx4-4jcj-g98j