Review reviewHigh

CVE-2026-58010

GNOME GLib, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 10

A flaw was found in GLib. An off-by-one error can occur in the gvs_tuple_is_normal function in the glib/gvariant-serialiser.c file when doing an alignment padding check because the bounds check uses > instead of >=, causing an out-of-bounds read of only 1 byte. This issue can cause a minor information disclosure of 1 byte and a denial of service when the out-of-bounds read crosses a page boundary.

CVSS: 8.2
EPSS: 0.32%
CISA KEV: Not listed
Published: 2026.06.30

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.32%

Technical severityCVSS 8.2

Vulnerability overview

Affected product and versions

Product: GNOME GLib, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 10
Affected versions: < 2.86.5, < 2.88.1, 2.88.0, 6.0, 7.0, 8.0, 9.0, 10.0
Fixed versions: 2.86.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that GNOME GLib, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 10 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
CWE: CWE-126