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VulnerabilityPublished Updated

CVE-2026-58010: GNOME GLib · Buffer Over-read

Affects GNOME GLibSource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium : upgrade to 2.88.1 or 2.86.5 when convenient.

Data as of 13 Nov 2026, 12:10 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.16.5
EPSS
0.4% chance of exploitation in 30 days – higher than 42% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.88.1, 2.86.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade GNOME GLib to 2.88.1 or 2.86.5.

Affected software

ProductAffectedFixed in
GNOMEGLibAffected
  • <2.88.1
Fixed in
  • 2.88.1
GNOMEGLibAffected
  • <2.86.5
Fixed in
  • 2.86.5

AI-suggested

Red Hat states that no mitigation is currently available or meets their criteria for ease of use, deployment, applicability, or stability. However, a security update fixing this vulnerability has been released for affected Red Hat products, including Red Hat Enterprise Linux 8. Users should apply the available security updates as described in the Red Hat advisory (RHSA-2026:49512). Monitoring vendor advisories for updates and applying patches promptly is recommended.

Description

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.

References

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