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CVE-2026-97313— Specific RPZ configurations and query patterns may result in an unexpected exit

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.

当递归型 BIND 服务器收到一个带有“希望递归”标志（RD=1）的查询，随后又收到一个非递归查询（RD=0）时，可能会因断言失败而退出，从而导致拒绝服务（DoS）。要触发此漏洞，该 BIND 服务器必须允许递归查询，并且至少配置了两个 RPZ 区域：其中一个区域的默认设置为"recursive-only yes"，另一个区域的设置为"recursive-only no"。 此问题影响以下 BIND 9 版本：9.16.0 至 9.18.50、9.20.0 至 9.20.29、9.21.0 至 9.21.26、9.

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

Affected Version Matrix 5

VendorProduct Version RangeStatus
ISC BIND 9 9.16.0≤ 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-2026-97313

Vulnerability Information
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Vulnerability Title
Specific RPZ configurations and query patterns may result in an unexpected exit
Source: CVE Program / CVE List V5
Vulnerability Description
A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query (RD=0) may exit with an assertion failure, resulting in a denial of service. To be vulnerable, the BIND server must allow recursive queries and have at least two RPZ zones configured: one with the default setting of "recursive-only yes", and the other with "recursive-only no". This issue affects BIND 9 versions 9.16.0 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC BIND 9 9.16.0 ~ 9.18.50 -

II. Public POCs for CVE-2026-97313

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III. Intelligence Information for CVE-2026-97313

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Vendor Advisories for CVE-2026-97313 (1)

Vendor Pages for CVE-2026-97313 (2)

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

CVE-2026-94300 8.1 HIGH Concurrent GSS-TSIG messages corrupt memory
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

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC
Same weakness: CWE-617

V. Comments for CVE-2026-97313

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