How severe is CVE-2026-58016?

CVE-2026-58016 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2026-58016?

Affected package information for CVE-2026-58016 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2026-58016?

Upgrade the affected component to the fixed release for CVE-2026-58016, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.

How do I detect CVE-2026-58016 in my code and dependencies?

Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

How do I mitigate CVE-2026-58016 if there is no patch (or I can't update yet)?

Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

Is CVE-2026-58016 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-58016 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-58016?

CVE-2026-58016 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 44th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-58016?

CVE-2026-58016 is classified as CWE-191 (CWE-191). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-58016 published, and has it been updated?

CVE-2026-58016 was published on June 30, 2026 and was last updated on October 3, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🛡️

Not in CISA KEV

HIGH severity

CVE-2026-58016 — glib

HIGH

CVE-2026-58016 is a high-severity (CVSS 7.5) CWE-191 vulnerability. A fix is available — see the affected versions and patch details below.

Glib: integer underflow in gio/gdbusintrospection.c via "g_dbus_node_info_new_for_xml"

Published

Jun 30, 2026

Updated

Oct 3, 2026

Affected

2 products

Patched

See advisory

Exploits

None indexed

Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-58016.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk-0.45%

Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-58016 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

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.

Affected Products

2 products · 6 configurations

Application

glibgnome

< 2.88.1

range

enterprise linuxredhat

5 versions

6.07.08.09.010.0

Detection & mitigation playbook

Vulnerability

Detect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Fix
Upgrade the affected component to the fixed release for CVE-2026-58016, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.
Workarounds
Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

Any applications processing D-Bus introspection XML input from untrusted sources with g_dbus_node_info_new_for_xml() are vulnerable to this issue. In GLib itself, the gdbus command line tool is the primary vector for local exploitation. However, other applications using the vulnerable function may process untrusted…

Workaround published by Red Hat

To mitigate this vulnerability, implement input validation to sanitize untrusted D-Bus introspection XML, specifically rejecting malformed structures such as <node> elements improperly nested within <method>, <signal>, <property> or <arg> elements before calling g_dbus_node_info_new_for_xml(). Alternatively, restricting the application to only process XML input from trusted, authenticated sources will completely neutralize this issue.

Source: Red Hat security advisory for CVE-2026-58016 (CC BY 4.0)

Product	Fixed in	Advisory
Red Hat Enterprise Linux 10	`glib2-0:2.80.4-12.el10_2.14`	RHSA-2026:42063
Red Hat Enterprise Linux 10.0 Extended Update Support	`glib2-0:2.80.4-4.el10_0.10`	RHSA-2026:51185
Red Hat Enterprise Linux 7 Extended Lifecycle Support	`glib2-0:2.56.1-13.el7_9`	RHSA-2026:51183
Red Hat Enterprise Linux 8	`mingw-glib2-0:2.70.1-9.el8_10`	RHSA-2026:49512
Red Hat Enterprise Linux 8	`glib2-0:2.56.4-170.el8_10`	RHSA-2026:42090
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	`glib2-0:2.56.4-10.el8_4.6`	RHSA-2026:51184
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	`glib2-0:2.56.4-158.el8_6.6`	RHSA-2026:51181
Red Hat Enterprise Linux 8.8 Telecommunications Update Service	`glib2-0:2.56.4-165.el8_8.1`	RHSA-2026:51182

UbuntuHIGH

USN-8794-1Ubuntu

Frequently Asked Questions

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.

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