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GLib2 CVE-2026-86469

| EUVDEUVD-2026-72488 MEDIUM
Improper Link Resolution Before File Access (CWE-59)
2026-09-07 redhat GHSA-847x-vxjh-whpv
Red Hat Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Openshift Container Platform 4 Suse Red Hat Hardened Images Red Hat
5.3
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.3 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
vuln.today AI
5.3 MEDIUM

Local-only TOCTOU race requiring directory write access (PR:L, AC:H); file-write redirection yields I:H with no confidentiality impact and minor availability disruption.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low

Lifecycle Timeline

3
Metadata Corrected
Sep 07, 2026 - 16:40 vuln.today
tag: Information Disclosure removed
Analysis Generated
Sep 07, 2026 - 16:36 vuln.today
CVE Published
Sep 07, 2026 - 16:00 nvd
MEDIUM 5.3

DescriptionCVE.org

A flaw was found in GLib2. When g_file_replace() is used with G_FILE_CREATE_REPLACE_DESTINATION and creating the .goutputstream-XXXXXX temporary file fails, the library unlinks the destination and recreates it without exclusive creation or symlink protection. A local attacker who can write to the destination directory can win that race and redirect the write to another file.

AnalysisAI

Symlink-following race condition in GLib2's g_file_replace() allows a local attacker with write access to the destination directory to redirect privileged file writes to arbitrary files. When the G_FILE_CREATE_REPLACE_DESTINATION flag is set and creation of the .goutputstream-XXXXXX temporary file fails, GLib2 unlinks the destination and then recreates it without O_EXCL (exclusive creation) or symlink-safe open semantics, opening a TOCTOU race window. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires four concurrent conditions: (1) the attacker holds local write permission to the directory containing the target file (PR:L); (2) a process - ideally one running with privileges the attacker does not hold - calls g_file_replace() on that file using the G_FILE_CREATE_REPLACE_DESTINATION flag; (3) the temporary file creation step (.goutputstream-XXXXXX) fails, triggering the unprotected fallback code path - this is an error condition, not the normal path; and (4) the attacker successfully wins the TOCTOU race between the destination unlink and the subsequent recreate without O_EXCL. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Real-world risk is constrained by multiple compounding prerequisites: the attacker must be a local user with write permission to the target directory, the failure path in g_file_replace() must be triggered, and the attacker must win a tight timing race. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the Red Hat-issued errata for glib2 once published via https://access.redhat.com/security/cve/CVE-2026-86469; no specific patched version number is confirmed in the available data. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.4 Affected
SUSE Linux Enterprise Micro 5.5 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected

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CVE-2026-86469 vulnerability details – vuln.today
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