CVE-2026-77658

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.20% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 9.9% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-08-28.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-26 12:10Z2 MO AGO

Last updated

2026-08-26 13:11Z2 MO AGO

Reserved

2026-08-21

Assigning CNA

fedora

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses

• CWE-121Stack-based Buffer OverflowVariant

Data version

5.2

Document digest

b884fedd40b7cf0cc01c27cb5cb177f5ddb6442272f17dcec2ce54ecd885ed96

• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-77658vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2520890https://bugzilla.redhat.com/show_bug.cgi?id=2520890issue-trackingx_refsource_REDHAT
• gitlab.gnome.orghttps://gitlab.gnome.org/GNOME/dia/-/blob/master/objects/network/bus.c
• gitlab.gnome.orghttps://gitlab.gnome.org/GNOME/dia/-/issues/581