Medium [CVE-2026-58010] Glib: buffer over-read in glib/gvariant-serialiser.c via gvs_tuple_is_normal
This medium-severity Red Hat Linux advisory covers CVE-2026-58010 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
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.
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; and 1 more.
Affected products named by the advisory: Red Hat Enterprise Linux 9.
- GLib before 2.86.5
- GLib before 2.88.1
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 2.86.5
- 2.88.1
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 2.86.5, 2.88.1. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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