# CVE-2026-15588: Gdbusserver: glib2: gdbusserver pre-authentication dos via unbounded sasl line buffering > An unauthenticated attacker can cause a denial of service in applications using GLib's GDBus by sending excessively long data streams, leading to resource exhaustion. - **Severity:** Medium 5.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 20 Jul 2026 - **Updated:** 29 Oct 2026 - **Also known as:** AZL-92994, BELL-CVE-2026-15588, CLSA-2026-1787154316, CLSA-2026-1788000309, CLSA-2026-1792167748, CLSA-2026-1792168154, CLSA-2026-1792168400, DEBIAN-CVE-2026-15588, ECHO-2015-e9ba-ec13, GHSA-hrq7-vgh7-p534, OESA-2026-3241, OESA-2026-3242, OESA-2026-3243, RHSA-2026:39985, RHSA-2026:40485, RHSA-2026:42329, ROOT-OS-DEBIAN-12-CVE-2026-15588, SUSE-SU-2026:23880-1, SUSE-SU-2026:23928-1, SUSE-SU-2026:23971-1, SUSE-SU-2026:23980-1, SUSE-SU-2026:4348-1, SUSE-SU-2026:4367-1, SUSE-SU-2026:4710-1, UBUNTU-CVE-2026-15588, openSUSE-SU-2026:11415-1, openSUSE-SU-2026:21977-1 ## What is CVE-2026-15588? CVE-2026-15588 is a medium-severity denial of service vulnerability in Cert Manager support for Red Hat OpenShift release 1.17, published on 20 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description A denial-of-service and resource exhaustion vulnerability exists within the `GDBus` component of GLib. The `gdbusauth` authentication mechanism fails to enforce proper length limitations on data lines read from a client. An unauthenticated local or remote attacker can exploit this lack of input validation by sending excessively long streams of data, causing the application to consume massive amounts of system memory and CPU, potentially leading to a crash or system hang. Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling) ## Which versions are affected by CVE-2026-15588? | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `glib2` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.1.hum1 | | `glib2` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.2.hum1 | | `glib2` | Red Hat:hummingbird:1 | All versions | 0:2.89.2-2.hum1 | | `glib2-devel` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.1.hum1 | | `glib2-devel` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.2.hum1 | | `glib2-devel` | Red Hat:hummingbird:1 | All versions | 0:2.89.2-2.hum1 | | `glib2-doc` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.1.hum1 | | `glib2-doc` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.2.hum1 | | `glib2-doc` | Red Hat:hummingbird:1 | All versions | 0:2.89.2-2.hum1 | | `glib2-static` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.1.hum1 | | `glib2-static` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.2.hum1 | | `glib2-static` | Red Hat:hummingbird:1 | All versions | 0:2.89.2-2.hum1 | | `glib2-tests` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.1.hum1 | | `glib2-tests` | Red Hat:hummingbird:1 | All versions | 0:2.89.1-1.2.hum1 | | `glib2-tests` | Red Hat:hummingbird:1 | All versions | 0:2.89.2-2.hum1 | | `glib2` | SUSE:Linux Enterprise Micro 5.3 | All versions | 2.70.5-150400.3.40.1 | | `glib2` | SUSE:Linux Enterprise Micro 5.4 | All versions | 2.70.5-150400.3.40.1 | | `glib2` | SUSE:Linux Enterprise Micro 5.5 | All versions | 2.70.5-150400.3.40.1 | | `glib2` | SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 2.78.6-150600.4.41.1 | | `glib2` | SUSE:Linux Enterprise Server 16.0 | All versions | 2.84.4-160000.5.1 | | `glib2-doc` | SUSE:Linux Enterprise Server 16.0 | All versions | 2.84.4-160000.5.1 | | `glib2` | SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 2.48.2-12.64.1 | | `glib2` | SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 2.84.4-160000.5.1 | | `glib2-doc` | SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 2.84.4-160000.5.1 | | `glib2` | SUSE:Linux Micro 6.0 | All versions | 2.76.2-14.1 | | `glib2` | SUSE:Linux Micro 6.1 | All versions | 2.78.6-slfo.1.1_8.1 | | `glib2` | SUSE:Linux Micro 6.2 | All versions | 2.84.4-160000.5.1 | | `glib2` | openSUSE:Leap 16.0 | All versions | 2.84.4-160000.5.1 | | `glib2-doc` | openSUSE:Leap 16.0 | All versions | 2.84.4-160000.5.1 | | `glib2` | openSUSE:Tumbleweed | All versions | 2.88.3-1.1 | ## How do I fix CVE-2026-15588? Apply the vendor's patch. ## Is CVE-2026-15588 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15588 exists. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-15588 and fix it if it is affected. What it is: CVE-2026-15588 is a medium-severity denial of service vulnerability in Cert Manager support for Red Hat OpenShift release 1.17, published on 20 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15588 exists. Affected product: Cert Manager support for Red Hat OpenShift release 1.17. 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-2026-15588/ (Markdown: https://insights.sbomify.com/CVE-2026-15588/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15588 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15588 - OSV: https://osv.dev/vulnerability/CVE-2026-15588 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-15588/ Summaries are generated and may contain mistakes; the official description above is the record.