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Description

A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.

PUBLISHED Reserved 2026-02-24 | Published 2026-03-25 | Updated 2026-03-25 | Assigner isc




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-772 Missing Release of Resource after Effective Lifetime

Product status

Default status
unaffected

9.20.0 (custom)
affected

9.21.0 (custom)
affected

9.20.9-S1 (custom)
affected

9.18.0 (custom)
unaffected

9.18.11-S1 (custom)
unaffected

Credits

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

References

kb.isc.org/docs/cve-2026-3104 (CVE-2026-3104) vendor-advisory

downloads.isc.org/isc/bind9/9.20.21 patch

downloads.isc.org/isc/bind9/9.21.20 patch

cve.org (CVE-2026-3104)

nvd.nist.gov (CVE-2026-3104)

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