# CVE-2026-88807: libXrender RenderQueryPictFormats Reply Heap-based Buffer Overflow > A heap-based buffer overflow in libXrender allows malicious X servers to inject code into attached X clients. - **Severity:** High 8.9 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 21 Sep 2026 - **Updated:** 22 Sep 2026 - **Also known as:** ALPINE-CVE-2026-88807, ALSA-2026:91003, ALSA-2026:91057, ALSA-2026:91267, AZL-103391, BELL-CVE-2026-88807, DEBIAN-CVE-2026-88807, ECHO-57f9-f47c-a5cd, GHSA-52cp-fjgx-xr28, OESA-2026-4476, OESA-2026-4477, OESA-2026-4478, OESA-2026-4479, RLSA-2026:91003, RLSA-2026:91267, ROOT-OS-DEBIAN-12-CVE-2026-88807, ROOT-OS-DEBIAN-13-CVE-2026-88807, SUSE-SU-2026:23886-1, SUSE-SU-2026:23900-1, SUSE-SU-2026:4395-1, SUSE-SU-2026:4397-1, UBUNTU-CVE-2026-88807, openSUSE-SU-2026:11834-1, openSUSE-SU-2026:21909-1 ## What is CVE-2026-88807? CVE-2026-88807 is a high-severity memory corruption vulnerability in X.org libXrender, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients. Weakness: CWE-122 (Heap-based Buffer Overflow) ## Which versions are affected by CVE-2026-88807? | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libXrender` | AlmaLinux:10 | All versions | 0.9.11-8.el10_2.1 | | `libXrender-devel` | AlmaLinux:10 | All versions | 0.9.11-8.el10_2.1 | | `libXrender` | AlmaLinux:8 | All versions | 0.9.10-8.el8_10 | | `libXrender-devel` | AlmaLinux:8 | All versions | 0.9.10-8.el8_10 | | `libXrender` | AlmaLinux:9 | All versions | 0.9.10-16.el9_8.2 | | `libXrender-devel` | AlmaLinux:9 | All versions | 0.9.10-16.el9_8.2 | | `libXrender` | Rocky Linux:10 | All versions | 0:0.9.11-8.el10_2.1 | | `libXrender` | Rocky Linux:8 | All versions | 0:0.9.10-8.el8_10 | | `libXrender` | SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Micro 5.3 | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Micro 5.4 | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Micro 5.5 | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Server 12 SP5-LTSS | All versions | 0.9.8-8.3.1 | | `libXrender` | SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Server 16.0 | All versions | 0.9.11-160000.3.1 | | `libXrender` | SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 0.9.8-8.3.1 | | `libXrender` | SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 0.9.10-150000.3.3.1 | | `libXrender` | SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 0.9.11-160000.3.1 | | `libXrender` | SUSE:Linux Micro 6.2 | All versions | 0.9.11-160000.3.1 | | `libXrender` | openSUSE:Leap 16.0 | All versions | 0.9.11-160000.3.1 | | `libXrender` | openSUSE:Tumbleweed | All versions | 0.9.12-2.1 | ## How do I fix CVE-2026-88807? Upgrade to a fixed version. ## Is CVE-2026-88807 being exploited? There is no known exploitation of CVE-2026-88807 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-88807 and fix it if it is affected. What it is: CVE-2026-88807 is a high-severity memory corruption vulnerability in X.org libXrender, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2026-88807 in the wild and no public exploit code. Affected product: X.org libXrender. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-88807/ (Markdown: https://insights.sbomify.com/CVE-2026-88807/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88807 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88807 - OSV: https://osv.dev/vulnerability/CVE-2026-88807 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-88807/ Summaries are generated and may contain mistakes; the official description above is the record.