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

Quick assessment

Affected
ISC BIND 9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

重放经过 GSS-TSIG 签名的 UDP 消息可能导致 服务出现内存损坏。若攻击者能够捕获此前已签名的 UDP 消息，并在协商的 TSIG 密钥仍有效时进行重放，同时向攻击者控制的区域发送精心构造的查询，则可能实现远程代码执行。 此漏洞影响以下 BIND 9 版本：9.11.0 至 9.18.50、9.20.0 至 9.20.29、9.21.0 至 9.21.26、9.11.3-S1 至 9.18.50-S1，以及 9.20.9-S1 至 9.20.29-S1。

CVSS 8.1 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
ISC BIND 9 9.11.0≤ 9.18.50 affected
9.20.0≤ 9.20.29 affected
9.21.0≤ 9.21.26 affected
9.11.3-S1≤ 9.18.50-S1 affected
9.20.9-S1≤ 9.20.29-S1 affected
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I. Basic Information for CVE-2026-94300

Vulnerability Information
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Vulnerability Title
Concurrent GSS-TSIG messages corrupt memory
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC BIND 9 9.11.0 ~ 9.18.50 -

II. Public POCs for CVE-2026-94300

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III. Intelligence Information for CVE-2026-94300

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Vendor Advisories for CVE-2026-94300 (1)

Vendor Pages for CVE-2026-94300 (2)

Same Patch Batch · ISC · 2026-10-21 · 4 CVEs total

CVE-2026-19630 7.5 HIGH Amplified resource exhaustion in inbound message processing
CVE-2026-96888 7.5 HIGH Named may terminate unexpectedly when a redirect zone is used with strict QNAME minimizati
CVE-2026-97313 7.5 HIGH Specific RPZ configurations and query patterns may result in an unexpected exit

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC
Same weakness: CWE-415

V. Comments for CVE-2026-94300

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