Reachable Assertion Affecting bind package, versions [9.20.0,9.20.21)[9.21.0,9.21.20)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-BIND-15812206
- published29 Mar 2026
- disclosed25 Mar 2026
- creditUnknown
Introduced: 25 Mar 2026
CVE-2026-3119 (opens in a new tab)How to fix?
Upgrade bind to version 9.20.21, 9.21.20 or higher.
Overview
Affected versions of this package are vulnerable to Reachable Assertion in the named process when an attacker with a valid Transaction Signature (TSIG) key sends a specially crafted query containing a TKEY record. An attacker can cause the DNS service to crash by exploiting this flaw remotely with authenticated access. This is only exploitable if the attacker possesses a valid TSIG key configured on the server.
Workaround
This vulnerability can be mitigated by restricting access to the named service to trusted networks and clients, disabling TSIG keys if not required, or ensuring TSIG keys are securely managed and only distributed to authorized clients.