Off-by-One Error in GLib Affects Alignment Padding Checks
CVE-2026-58010

6.5MEDIUM

Key Information:

Vendor

Gnome
Status
Glib
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Vendor
CVE Published:
30 June 2026

What is CVE-2026-58010?

A critical flaw exists in GLib due to an off-by-one error in the gvs_tuple_is_normal function. This error arises during the alignment padding checks, where the bounds verification incorrectly uses > instead of >=. As a result, this can lead to an out-of-bounds read, potentially revealing an additional byte of information and leading to a denial of service, especially if the read operation crosses a page boundary.

Affected Version(s)

GLib 0 < 2.86.5

GLib 0 < 2.88.1

References

https://access.redhat.com/security/cve/CVE-2026-58010
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2492243
issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/glib/-/issues/3915

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank linhlhq for reporting this issue.
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