CVE•Published 2026-05-20•Modified 2026-05-21•0 articles on news•5 live references•NVD data

CVE-2026-5946Isc · Bind

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

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

EPSS percentile

—

Weaknesses (CWE)

CWE-20Improper Input Validation CWE-125Out-of-bounds Read CWE-617Reachable Assertion CWE-754Improper Check for Unusual or Exceptional Conditions CWE-843Access of Resource Using Incompatible Type ('Type Confusion')

Description

Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data — can cause assertion failures in `named`. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

Timeline

Published 2026-05-20

Modified 2026-05-21

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-5946

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Isc Bind"

All exposed Isc Bind instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Bind"

HTTP body or banner mentions "Bind" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-5946