CVE-2026-77159

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 ImpactpartialSuccessful exploitation gives limited 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

0.16% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 5.3% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-16.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

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

2026-09-11 10:32Z1 MO AGO

Last updated

2026-09-15 15:40Z1 MO AGO

Reserved

2026-08-20

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

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

Weaknesses

• CWE-61UNIX Symbolic Link (Symlink) FollowingCompound

Data version

5.2

Document digest

93f6bc6e9dfb44cb831837008cb5a942ec6219f941acae9716dd6b12582c9fa2

• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-77159vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2531811https://bugzilla.redhat.com/show_bug.cgi?id=2531811issue-trackingx_refsource_REDHAT
• gitlab.comhttps://gitlab.com/libvirt/libvirt/-/work_items/909