Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-19630— Amplified resource exhaustion in inbound message processing

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.

在 BIND 解析器中，具有特定结构的入站 DNS 协议消息会触发额外的处理流程，而 BIND 并未对此类处理施加任何限制。若 DNS 消息中包含恶意构造的大量此类结构，将导致 BIND 在处理过程中消耗不成比例的 CPU 时间和内存资源。 此问题影响以下 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 9.20.9-S1 至 9.20.29-S1

CVSS 7.5 · High

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
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-19630

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Amplified resource exhaustion in inbound message processing
Source: CVE Program / CVE List V5
Vulnerability Description
In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with no limit imposed by BIND. A DNS message with a maliciously large number of such structures will cause BIND to consume disproportionate amounts of CPU time and memory during processing. 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
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-2026-19630

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-19630

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-19630 (1)

Vendor Pages for CVE-2026-19630 (2)

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

CVE-2026-94300 8.1 HIGH Concurrent GSS-TSIG messages corrupt memory
CVE-2026-96888 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-407

V. Comments for CVE-2026-19630

No comments yet

Leave a comment