All vulnerabilities
CVE-2026-94300

BIND 9: Concurrent GSS-TSIG messages corrupt memory

ISC BIND 9
Open in ThreatlineRecord JSON
CVSS
8.1High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.73%Chance of exploitation activity in the next 30 days, higher than 53% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published21 Oct 2026Updated 22 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

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.

Text from CVE List

Affected versions 5

  • BIND 9affected: 9.11.0 through 9.18.50CVE List
  • BIND 9affected: 9.20.0 through 9.20.29CVE List
  • BIND 9affected: 9.21.0 through 9.21.26CVE List
  • BIND 9affected: 9.11.3-S1 through 9.18.50-S1CVE List
  • BIND 9affected: 9.20.9-S1 through 9.20.29-S1CVE List

References 3