# CVE-2026-58016: Glib: integer underflow in gio/gdbusintrospection.c via "g_dbus_node_info_new_for_xml"

> An attacker can cause a denial of service in applications using GLib by sending malformed D-Bus introspection XML that triggers an integer underflow and out-of-bounds read.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Jun 2026
- **Updated:** 14 Oct 2026
- **Also known as:** ALSA-2026:42063, ALSA-2026:42089, ALSA-2026:42090, AZL-91433, BELL-CVE-2026-58016, CLSA-2026-1783432728, CLSA-2026-1783432860, CLSA-2026-1783440677, CLSA-2026-1783514794, CLSA-2026-1783515023, DEBIAN-CVE-2026-58016, ECHO-b93b-87d5-d1fa, GHSA-8rpw-4xx7-27w7, JLSEC-2026-1249, MINI-7ffv-9qqc-q294, RHSA-2026:42063, RHSA-2026:42089, RHSA-2026:42090, RHSA-2026:51175, RHSA-2026:51176, RHSA-2026:51177, RHSA-2026:51181, RHSA-2026:51182, RHSA-2026:51183, RHSA-2026:51184, RHSA-2026:51185, RLSA-2026:42063, RLSA-2026:42089, RLSA-2026:42090, ROOT-OS-ALPINE-323-CVE-2026-58016, ROOT-OS-DEBIAN-11-CVE-2026-58016, ROOT-OS-DEBIAN-12-CVE-2026-58016, UBUNTU-CVE-2026-58016

## What is CVE-2026-58016?

CVE-2026-58016 is a high-severity vulnerability in Redhat Enterprise Linux, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-191 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2026-58016?

It affects 14 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `glib2` | AlmaLinux:10 | All versions | 2.80.4-12.el10_2.14 |
| `glib2-devel` | AlmaLinux:10 | All versions | 2.80.4-12.el10_2.14 |
| `glib2-doc` | AlmaLinux:10 | All versions | 2.80.4-12.el10_2.14 |
| `glib2-static` | AlmaLinux:10 | All versions | 2.80.4-12.el10_2.14 |
| `glib2-tests` | AlmaLinux:10 | All versions | 2.80.4-12.el10_2.14 |
| `glib2` | AlmaLinux:8 | All versions | 2.56.4-170.el8_10 |
| `glib2-devel` | AlmaLinux:8 | All versions | 2.56.4-170.el8_10 |
| `glib2-doc` | AlmaLinux:8 | All versions | 2.56.4-170.el8_10 |
| `glib2-fam` | AlmaLinux:8 | All versions | 2.56.4-170.el8_10 |
| `glib2-static` | AlmaLinux:8 | All versions | 2.56.4-170.el8_10 |
| `glib2-tests` | AlmaLinux:8 | All versions | 2.56.4-170.el8_10 |
| `glib2` | AlmaLinux:9 | All versions | 2.68.4-19.el9_8.2 |
| `glib2-devel` | AlmaLinux:9 | All versions | 2.68.4-19.el9_8.2 |
| `glib2-doc` | AlmaLinux:9 | All versions | 2.68.4-19.el9_8.2 |
| `glib2-static` | AlmaLinux:9 | All versions | 2.68.4-19.el9_8.2 |
| `glib2-tests` | AlmaLinux:9 | All versions | 2.68.4-19.el9_8.2 |
| `glib2` | Red Hat:enterprise_linux:10.2 | All versions | 0:2.80.4-12.el10_2.14 |
| `glib2-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:2.80.4-12.el10_2.14 |
| `glib2-debugsource` | Red Hat:enterprise_linux:10.2 | All versions | 0:2.80.4-12.el10_2.14 |
| `glib2-devel` | Red Hat:enterprise_linux:10.2 | All versions | 0:2.80.4-12.el10_2.14 |
| `glib2-devel-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:2.80.4-12.el10_2.14 |
| `glib2-doc` | Red Hat:enterprise_linux:10.2 | All versions | 0:2.80.4-12.el10_2.14 |
| `glib2-static` | Red Hat:enterprise_linux:10.2 | All versions | 0:2.80.4-12.el10_2.14 |
| `glib2-tests` | Red Hat:enterprise_linux:10.2 | All versions | 0:2.80.4-12.el10_2.14 |
| `glib2-tests-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:2.80.4-12.el10_2.14 |
| `glib2` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-170.el8_10 |
| `glib2-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-170.el8_10 |
| `glib2-debugsource` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-170.el8_10 |
| `glib2-devel` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-170.el8_10 |
| `glib2-devel-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-170.el8_10 |
| `glib2-fam` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-170.el8_10 |
| `glib2-fam-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-170.el8_10 |
| `glib2-tests` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-170.el8_10 |
| `glib2-tests-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-170.el8_10 |
| `glib2-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-170.el8_10 |
| `glib2-debugsource` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-170.el8_10 |
| `glib2-devel-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-170.el8_10 |
| `glib2-doc` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-170.el8_10 |
| `glib2-fam-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-170.el8_10 |
| `glib2-static` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-170.el8_10 |

Products: Gnome Glib, Redhat Cert-Manager Operator, Redhat Codeready Linux Builder, Redhat Codeready Linux Builder Eus, Redhat Discovery, Redhat Enterprise Linux, Redhat Enterprise Linux Aus, Redhat Enterprise Linux Els, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server Tus, Redhat Enterprise Linux Update Services for Sap Solutions, Redhat Insights-Proxy, Redhat Openshift Ai, Redhat Update Infrastructure.

## How do I fix CVE-2026-58016?

Apply the vendor's patch.

## Is CVE-2026-58016 being exploited?

There is no known exploitation of CVE-2026-58016 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2020-35457](https://insights.sbomify.com/CVE-2020-35457/): Integer overflow in n/a (high 7.8)
- [CVE-2009-3289](https://insights.sbomify.com/CVE-2009-3289/): Privilege escalation in n/a (high 7.8)
- [CVE-2025-13601](https://insights.sbomify.com/CVE-2025-13601/): Glib: integer overflow in in g_escape_uri_string() (high 7.7)
- [CVE-2025-4056](https://insights.sbomify.com/CVE-2025-4056/): Glib: glib crash after long command line (high 7.5)
- [CVE-2019-13012](https://insights.sbomify.com/CVE-2019-13012/): Misconfiguration in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-58016 and fix it if it is affected.

What it is: CVE-2026-58016 is a high-severity vulnerability in Redhat Enterprise Linux, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-58016 in the wild and no public exploit code.

Affected product: Redhat Enterprise Linux. 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-2026-58016/ (Markdown: https://insights.sbomify.com/CVE-2026-58016/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-58016
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-58016
- OSV: https://osv.dev/vulnerability/CVE-2026-58016

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-58016/
Summaries are generated and may contain mistakes; the official description above is the record.