CVE-2026-58015

mediumCVSS 5.9covered by 2 sourcesfirst seen 2026-06-09

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.

CSIRTS triage

What: A path traversal vulnerability exists in 'keyring_lookup_entry' and 'mechanism_client_data_receive'.
Who is affected: Deployments of Glib that utilize the affected functions.
Urgency: Remediation is important due to the medium severity of the vulnerability.
Action: Update to the latest version of Glib to fix this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.

Advisory coverage (2)

mediumCVE-2026-58015: A flaw was found in GLib. The D-Bus client-side implementation of the DBUS_COOKIE_SHA1 SASL au…nvd · 2026-06-30
mediumCVE-2026-58015: Glib: path traversal in glib/gio/gdbusauthmechanismsha1.c via keyring_lookup_entry and mechani…msrc · 2026-06-09

External references

NVD record for CVE-2026-58015

CVE.org record

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