CVE-2026-58010: GLib off-by-one error in GVariant serializer

CVE-2026-58010 · Severity: medium · CVSS 6.5 · Published 2026-06-30

GLib is a fundamental software library used by many Linux applications to handle data structures and communication. A flaw in how it processes certain data formats (GVariant) could allow an attacker to cause an application to crash or potentially leak a small amount of memory. This is particularly relevant for systems that process untrusted data from the network or via system communication buses like D-Bus.

Technologies: Gnome Glib, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9. Vendors: Gnome, Red Hat.

Quick answers

Is CVE-2026-58010 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-58010 being exploited in the wild.
How severe is CVE-2026-58010?
Medium severity, with a CVSS score of 6.5, published 30 June 2026.
Which products and versions are affected?
GNOME GLib; Red Hat Red Hat Enterprise Linux 6; Red Hat Red Hat Enterprise Linux 7; Red Hat Red Hat Enterprise Linux 8; and 2 more.
Is there a fix for CVE-2026-58010?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-58010 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-58010?
Check whether you run Gnome Glib, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An off-by-one error exists in the gvs_tuple_is_normal function within glib/gvariant-serialiser.c. During an alignment padding check, the code uses a '>' comparison instead of '>=' when validating offsets against the buffer size. This allows a 1-byte out-of-bounds read when the offset equals the value size. An attacker providing specially crafted GVariant data (e.g., via D-Bus or network protocols) can trigger this read. While the impact is primarily a 1-byte information disclosure, it can result in a denial of service (crash) if the out-of-bounds read crosses a memory page boundary. A fix involving a bounds check correction has been proposed.

Affected products

  • GNOME GLib
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 10

Timeline

  • 2026-01-29: disclosed: Initial report via YesWeHack
  • 2026-06-30: advisory: CVE published by Red Hat and NVD

References

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