CVE-2026-3119Network attack vector

Authenticated service crash via signed TKEY query

Published Mar 25, 2026 · Updated Mar 25, 2026

Denial of service in affected Internet Systems Consortium BIND 9 releases allows remote authenticated users to crash the named DNS server. ISC maps the flaw to a reachable assertion in TKEY processing but has not disclosed the assertion site or the state that triggers it. A query must carry a valid TSIG from a key declared in named's configuration; 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 can terminate whether serving authoritative or recursive DNS.

CVSS severity6.5
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Internet Systems Consortium BIND 9 releases allows remote authenticated users to crash the named DNS server. ISC maps the flaw to a reachable assertion in TKEY processing but has not disclosed the assertion site or the state that triggers it. A query must carry a valid TSIG from a key declared in named's configuration; 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 can terminate whether serving authoritative or recursive DNS.

The record

CVE
CVE-2026-3119
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
Internet Systems Consortium
Product
BIND 9
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.20.0 <=9.20.20
  2. Affected versionversion=9.20.9-S1 <=9.20.20-S1
  3. Affected versionversion=9.21.0 <=9.21.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Internet Systems Consortium · BIND 9version=9.20.0 <=9.20.20; version=9.20.9-S1 <=9.20.20-S1; version=9.21.0 <=9.21.19

Published CVSS scores

6.5Internet Systems ConsortiumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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