ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-94300

Concurrent GSS-TSIG messages corrupt memory

Published Oct 21, 2026 · catalog updated Oct 23, 2026 · ISC BIND 9

Last checked Oct 31, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-94300. EPSS is 0.95%. Act only if a listed version of ISC BIND 9 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.95%
Remediation
Advisory link
Affected products
Alpine:v3.22 bind · Alpine:v3.23 bind · Alpine:v3.24 bind · vendor ISC BIND 9

Replaying GSS-TSIG signed UDP messages can result in memory corruption in " ". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote code execution. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Alpine:v3.22 bind0 → 9.20.30-r0
  • Alpine:v3.23 bind0 → 9.20.30-r0
  • Alpine:v3.24 bind0 → 9.20.30-r0
  • vendor ISC BIND 9version unspecified

How to fix CVE-2026-94300

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-94300. EPSS is 0.95%. Act only if a listed version of ISC BIND 9 is installed.

Which versions are affected?

Compare what you have installed with 0 → 9.20.30-r0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-362: Race Condition; CWE-415: Double Free. EPSS 0.95%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 21, 2026 · Canadian Centre for Cyber Security

    Detected

    CVE-2026-94300 is listed by ISC BIND security advisory (AV26-1072).

  2. Oct 22, 2026 · CVE.org

    Updated

    Replaying GSS-TSIG signed UDP messages can result in memory corruption in " ". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote code execution. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.

  3. Oct 23, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind fixed in 9.20.30-r0; bind fixed in 9.20.30-r0; bind fixed in 9.20.30-r0

  4. Oct 23, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind fixed in 9.20.30-r0

  5. Oct 23, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    Replaying GSS-TSIG signed UDP messages can result in memory corruption in " ". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote code execution. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.

Sources

  • BSI CERT-BundGovernment advisoryCVE-2026-94300

    Internet Systems Consortium BIND: Mehrere Schwachstellen

    wid.cert-bund.de
  • Canadian Centre for Cyber SecurityGovernment advisoryCVE-2026-94300

    Serial number: AV26-1072 Date: October 21, 2026 As of October 21, 2026, ISC is affected by a vulnerability in the following products: BIND 9 Versions 9.11.0 to 9.18.50 Versions 9.11.0 to 9.18.50 ◦ Versions 9.21.0 to 9.21.26 BIND Supported Preview Edition Versions 9.11.3-S1 to 9.1

    cyber.gc.ca
  • CVE.orgVulnerability recordCVE-2026-94300

    Replaying GSS-TSIG signed UDP messages can result in memory corruption in " ". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-94300

    30-day exploitation probability 0.95%

    first.org
  • Openwall OSS SecurityThreat researchCVE-2026-94300

    Research mention from Openwall OSS Security. Not confirmation of exploitation.

    openwall.com
  • OpenSSF OSV / OSV ScannerPackage advisoryALPINE-CVE-2026-94300
    osv.dev
  • Tenable CVE DatabaseVulnerability recordCVE-2026-94300

    Replaying GSS-TSIG signed UDP messages can result in memory corruption in " ". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote code execution. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.

    tenable.com
  • Trivy Vulnerability DBPackage advisoryALPINE-CVE-2026-94300

    Replaying GSS-TSIG signed UDP messages can result in memory corruption in " ". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may

    osv.dev

References

Freshness

Last verified in this catalog Oct 31, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • BSI CERT-BundOct 31, 2026
  • FIRST EPSSOct 28, 2026
  • Canadian Centre for Cyber SecurityOct 28, 2026
  • Trivy Vulnerability DBOct 25, 2026
  • OpenSSF OSV / OSV ScannerOct 24, 2026
  • CVE.orgOct 23, 2026
  • Tenable CVE DatabaseOct 23, 2026
  • Openwall OSS SecurityOct 23, 2026