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.

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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.
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