CVE-2026-5947

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• 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

1.39% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 70.4% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-08-24.

Red Hat severity

Important. 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

2026-05-20 13:10Z3 MO AGO

Last updated

2026-09-01 12:05Z3 DAYS AGO

Reserved

2026-04-09

Assigning CNA

isc

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class
• CWE-416Use After FreeVariant

Data version

5.2

Document digest

d37806ba7ae8b3fe91e90a98f06d021e41e31f013461c4647dcfae2b2bd79516

• kb.isc.orgCVE-2026-5947https://kb.isc.org/docs/cve-2026-5947vendor-advisory
• downloads.isc.orghttps://downloads.isc.org/isc/bind9/9.20.23patch
• downloads.isc.orghttps://downloads.isc.org/isc/bind9/9.21.22patch
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-5947vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2479772https://bugzilla.redhat.com/show_bug.cgi?id=2479772issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5947.jsonx_sadp-csaf-vex
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:7412vendor-advisoryx_refsource_REDHAT