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CVE-2026-19667— Remote assertion failure via 16-bit length truncation in `dns_ncache_add()`

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.

如果攻击者控制的权威服务器能够返回一个长度恰好为 65536 字节的否定应答， （BIND 的 DNS 守护进程）中的缺陷会导致生成一个长度为 0 字节的负缓存条目。当后续读取该条目时， 会发生中止（aborts）。 此问题影响以下版本的 BIND 9： 9.11.0 至 9.18.50 9.20.0 至 9.20.27 9.21.0 至 9.21.25 9.11.3-S1 至 9.18.50-S1 9.20.9-S1 至 9.20.27-S1

CVSS 7.5 · High
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I. Basic Information for CVE-2026-19667

Vulnerability Information
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Vulnerability Title
Remote assertion failure via 16-bit length truncation in `dns_ncache_add()`
Source: CVE Program / CVE List V5
Vulnerability Description
If an attacker-controlled authoritative server can produce a negative answer that is exactly 65536 bytes, then a flaw in `named` results in a negative cache entry of 0 bytes. When this entry is subsequently read, `named` aborts. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
数值截断错误
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-2026-19667

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III. Intelligence Information for CVE-2026-19667

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Vendor Advisories for CVE-2026-19667 (1)

Vendor Pages for CVE-2026-19667 (2)

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-2026-77692 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-2026-19662 5.9 MEDIUM qpcache NOQNAME proof use-after-free crashes recursive resolver
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-197

V. Comments for CVE-2026-19667

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