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CVE-2026-19662— qpcache NOQNAME proof use-after-free crashes recursive resolver

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.

攻击者可能能够导致 解析器发生中止（abort）。该攻击需要诱使受害方的解析器向一个由攻击者控制的权威服务器所托管的 DNSSEC 签名区域发送多个查询。如果该权威服务器返回一系列精心构造的回答，且这些回答以特定的顺序和特定的时间间隔到达， 解析器将遇到一个“释放后使用”（use-after-free）缺陷，并随之中止运行。 此问题影响以下 BIND 9 版本： 9.11.0 至 9.18.50 9.20.0 至 9.20.27 9.11.3-S1 至 9.18.50-S1 9.20.9-S1 至 9.20.27-

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-19662

Vulnerability Information
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Vulnerability Title
qpcache NOQNAME proof use-after-free crashes recursive resolver
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
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-2026-19662

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III. Intelligence Information for CVE-2026-19662

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Vendor Advisories for CVE-2026-19662 (1)

Vendor Pages for CVE-2026-19662 (1)

Same Patch Batch · ISC · 2026-09-16 · 14 CVEs total

CVE-2026-81736 7.5 HIGH Remote CPU denial of service through cached SVCB/HTTPS AliasMode trees
CVE-2026-19667 7.5 HIGH Remote assertion failure via 16-bit length truncation in `dns_ncache_add()`
CVE-2026-77692 7.5 HIGH Unauthenticated remote crash of named via a single DoH SIG(0) request
CVE-2026-81563 7.5 HIGH SVCB AliasMode additional-data error leaks qpcache references
CVE-2026-19666 7.5 HIGH Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path
CVE-2026-80274 7.5 HIGH Validating resolver can abort while caching a mismatched NOQNAME proof
CVE-2026-76163 7.5 HIGH named aborts on a TKEY query when the user configuration has no global options statement
CVE-2026-19033 6.5 MEDIUM Unauthenticated IXFR deltas are applied to the live zone before TSIG verification
CVE-2026-19941 5.9 MEDIUM checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof
CVE-2026-77119 5.9 MEDIUM NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets
CVE-2026-78301 5.8 MEDIUM Out-of-zone database nodes can become authoritative zone cuts
CVE-2026-75029 5.3 MEDIUM Message parser retains every identical singleton RDATA, enabling wire-to-work amplificatio
CVE-2026-19668 5.3 MEDIUM Resource Exhaustion via Excessive DNSSEC Cryptographic Material Matching

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC
Same weakness: CWE-416

V. Comments for CVE-2026-19662

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