CVE-2026-94300CWE-362CWE-415

CVE-2026-94300

High · published October 21, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
53.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00734 · 53.9th percentile
Weaknesses
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'); CWE-415 · Double Free
Published
2026-10-21T17:21Z
References (3)
https://downloads.isc.org/isc/bind9/9.20.30 · [email protected]https://downloads.isc.org/isc/bind9/9.21.27 · [email protected]https://kb.isc.org/docs/cve-2026-94300 · [email protected]
EPSS history
Timeline
  • 23 OCT 04:10Z
    EPSS moved — → 1%
    epss
  • 21 OCT 12:45Z
    Concurrent GSS-TSIG messages corrupt memory
    cvelistv5
  • 21 OCT 12:45Z
    Concurrent GSS-TSIG messages corrupt memory
    cvelistv5