Path Traversal in GNOME Glib
CVE-2026-58015
A flaw was found in GLib. The D-Bus client-side implementation of the DBUS_COOKIE_SHA1 SASL authentication mechanism does not validate the cookie_context parameter received from the server. A malicious D-Bus server can supply a cookie_context containing path traversal sequences, causing the client to read an arbitrary file and exfiltrate sensitive data by verifying guessed file contents against a generated hash.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (58.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.009 · change: +0.004
Affected products
- GNOME Glib — versions 0
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8 — versions 0:2.70.1-9.el8_10
- Red Hat Enterprise Linux 9 — versions 0:2.68.4-19.el9_8.9
- Red Hat Hardened Images
- Red Hat Openshift Container Platform 4
- Red Hat Enterprise Linux — versions 6.0, 7.0, 8.0
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-58015 (Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory, Issue Tracking)
- gitlab.gnome.org/GNOME/glib/-/issues/3931 (Exploit, Issue Tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:49512 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:55440 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:57015 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:58981 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:61766 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:61783 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:63135 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-58015?
- CVE-2026-58015 is a medium-severity vulnerability in GNOME Glib, classified under Path Traversal. CVSS score: 5.9/10. Published 2026-06-30.
- How severe is CVE-2026-58015?
- Medium severity. CVSS v3 base score is 5.9 out of 10.