CVE-2026-94300: Flaw in ISC BIND 9 Scores 8.1 on CVSS
A newly published high vulnerability in ISC BIND 9 carries a CVSS score of 8.1. Here is what is affected and how to respond.
Key points
- CVE-2026-94300 affects ISC BIND 9.
- CVSS 8.1 (High).
- No exploitation confirmed yet.
A high security flaw tracked as CVE-2026-94300 has been published in the National Vulnerability Database for ISC BIND 9, with a CVSS base score of 8.1.
At a glance
- CVE
- CVE-2026-94300
- Product
- ISC BIND 9
- CVSS
- 8.1 High
- Weakness
- CWE-415, CWE-362
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: 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 versions
| Vendor | Product | Versions |
|---|---|---|
| Isc | BIND 9 | up to 9.18.50, up to 9.20.29, up to 9.21.26, up to 9.18.50-S1 |
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-94300
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-94300?
CVE-2026-94300 is a CWE-415, CWE-362 vulnerability in ISC BIND 9.
How severe is CVE-2026-94300?
It has a CVSS score of 8.1 High.
Is CVE-2026-94300 being exploited?
There is no public confirmation of exploitation at the time of publication.
