What’s Vulnerable › Vulnerabilities

CVE-2026-94300: Concurrent GSS-TSIG messages corrupt memory

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-26
• Weakness: CWE-362

Description

Replaying GSS-TSIG signed UDP messages can result in memory corruption in "`named`". 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.

Affected products

• ISC BIND: from 9.11.0 through 9.18.50; from 9.20.0 through 9.20.29; from 9.21.0 through 9.21.26; from 9.11.3-S1 through 9.18.50-S1; from 9.20.9-S1 through 9.20.29-S1

References

• https://downloads.isc.org/isc/bind9/9.20.30
• https://downloads.isc.org/isc/bind9/9.21.27
• https://kb.isc.org/docs/cve-2026-94300

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