Memory Leak Vulnerability in BIND Resolver Affected by ISC
CVE-2026-3104

7.5HIGH

Key Information:

Vendor

Isc
Status
Bind 9
Vendor
CVE Published:
25 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-3104?

A vulnerability exists in the BIND resolver, which can be exploited by sending a specially crafted DNS query. This can lead to a memory leak, potentially affecting the stability and performance of the resolver under certain conditions. It is essential to update BIND to the latest patched versions to safeguard against this issue.

Affected Version(s)

BIND 9 9.20.0 <= 9.20.20

BIND 9 9.21.0 <= 9.21.19

BIND 9 9.20.9-S1 <= 9.20.20-S1

References

https://kb.isc.org/docs/cve-2026-3104
vendor-advisory
https://downloads.isc.org/isc/bind9/9.20.21
patch
https://downloads.isc.org/isc/bind9/9.21.20
patch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention.
.