Search/CVE-2026-81563
● CVE — High

CVE-2026-81563

DiscoveredSep 16, 2026UpdatedOct 26, 2026

A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate internal resources. If this happens repeatedly, resource exhaustion will eventually prevent the resolver from performing new recursive lookups. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

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CVSS v3.1
7.5 HIGH
EPSS
0.57%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
3
sources referencing this CVE
Related IOCs
0
seen in the same coverage
Intelligence Reports1
1 intelligence report available

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EPSS Trend
Sep 19, 2026 → Oct 6, 2026
▲ 0.09pp
0.48% → 0.57% over 3 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityNONE
IntegrityNONE
AvailabilityHIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Connections
4 relationships
Timeline
disclosure → media coverage
Sep 16, 2026
Disclosure — published as a CVE record. · last revised by NVD Oct 26, 2026
Sep 17, 2026
thehackernews.com reports: BIND 9 Update Fixes 14 Flaws, Including an Unauthenticated Crash Over DNS-over-HTTPS
Sep 17, 2026
securityweek.com reports: ISC Patches 14 Vulnerabilities in BIND 9 Security Update
Nov 3, 2026
ubuntu.com reports: USN-8969-1: Bind vulnerabilities