CVE-2026-58010: A flaw was found in GLib

Q: How do I fix CVE-2026-58010?

glib: upgrade to 2.86.5; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-58010 being exploited?

CVE-2026-58010 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-58010 affect?

CVE-2026-58010 affects glib, enterprise linux. Severity is medium (CVSS 6.5). 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

This week

MEDIUM 6.5REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2026-58010 is a medium-severity flaw (CVSS 6.5) affecting glib, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-126
Published	2026-06-30
Last modified	2026-10-14

Publisher (CNA): Red Hat, Inc. · Vendor: gnome · redhat

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-30 13:19 UTCPublished CVE record published
2026-10-14 20:17 UTCUpdated Record last modified

gnome glib UPGRADE

Affected: < 2.86.5 · 2.88.0

Fixed in: 2.86.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy glib || rpm -q glib || glib --version

2. UPGRADE to 2.86.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade glib

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade glib

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

redhat enterprise linux MITIGATE

Affected: 6.0 · 7.0 · 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-58010?

glib: upgrade to 2.86.5; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-58010 being exploited?

CVE-2026-58010 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-58010 affect?

CVE-2026-58010 affects glib, enterprise linux. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-58010?

Priority 48/100. Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2026-58015 MEDIUM 5.9 UPGRADE MITIGATE A flaw was found in GLib
CVE-2026-58014 HIGH 7.3 UPGRADE MITIGATE A flaw was found in GLib
CVE-2026-58016 HIGH 7.5 UPGRADE MITIGATE A flaw was found in GLib
CVE-2026-58013 MEDIUM 6.5 UPGRADE MITIGATE A flaw was found in GLib
CVE-2026-58012 MEDIUM 6.5 UPGRADE MITIGATE A flaw was found in GLib

References

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