CVE-2025-14087: Glib: glib: buffer underflow in gvariant parser leads to heap corruption

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-10 · updated 2026-10-14
Weakness: CWE-190

Description

A flaw was found in GLib (Gnome Lib). This vulnerability allows a remote attacker to cause heap corruption, leading to a denial of service or potential code execution via a buffer-underflow in the GVariant parser when processing maliciously crafted input strings.

Affected products

GNOME GLib: before 2.86.3 — fixed in 2.86.3
Red Hat Enterprise Linux: 7.0, 8.0, 9.0, 10.0

How to fix

Upgrade to a fixed version: GNOME GLib 2.86.3. Check the vendor advisory for mitigations.

References

https://access.redhat.com/errata/RHSA-2026:15953
https://access.redhat.com/errata/RHSA-2026:15969
https://access.redhat.com/errata/RHSA-2026:15971
https://access.redhat.com/errata/RHSA-2026:19148
https://access.redhat.com/errata/RHSA-2026:19361
https://access.redhat.com/errata/RHSA-2026:19452
https://access.redhat.com/errata/RHSA-2026:19457
https://access.redhat.com/errata/RHSA-2026:19459
https://access.redhat.com/errata/RHSA-2026:19460
https://access.redhat.com/errata/RHSA-2026:19523
https://access.redhat.com/errata/RHSA-2026:19524
https://access.redhat.com/errata/RHSA-2026:19565

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