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CVE-2026-27853— Out-of-bounds write when rewriting large DNS packets

Quick assessment

Affected
PowerDNS DNSdist
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.

PowerDNS DNSdist是PowerDNS公司的一个提供DNS流量负载均衡与安全防护能力的代理软件。 PowerDNS DNSdist存在安全漏洞，该漏洞源于使用DNSQuestion:changeName或DNSResponse:changeName方法时存在越界写入，可能导致崩溃和拒绝服务。

CVSS 5.9 · Medium EPSS 1.50% · P73

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification
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I. Basic Information for CVE-2026-27853

Vulnerability Information
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Vulnerability Title
Out-of-bounds write when rewriting large DNS packets
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker might be able to trigger an out-of-bounds write by sending crafted DNS responses to a DNSdist using the DNSQuestion:changeName or DNSResponse:changeName methods in custom Lua code. In some cases the rewritten packet might become larger than the initial response and even exceed 65535 bytes, potentially leading to a crash resulting in denial of service.
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
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PowerDNS DNSdist 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerDNS DNSdist是PowerDNS公司的一个提供DNS流量负载均衡与安全防护能力的代理软件。 PowerDNS DNSdist存在安全漏洞，该漏洞源于使用DNSQuestion:changeName或DNSResponse:changeName方法时存在越界写入，可能导致崩溃和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PowerDNS DNSdist 1.9.0 ~ 1.9.12 -

II. Public POCs for CVE-2026-27853

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III. Intelligence Information for CVE-2026-27853

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Vendor Advisories for CVE-2026-27853 (1)

Same Patch Batch · PowerDNS · 2026-03-31 · 7 CVEs total

CVE-2026-24029 6.5 MEDIUM DNS over HTTPS ACL bypass
CVE-2026-24030 5.3 MEDIUM Unbounded memory allocation for DoQ and DoH3
CVE-2026-24028 5.3 MEDIUM Out-of-bounds read when parsing DNS packets via Lua
CVE-2026-27854 4.8 MEDIUM Use after free when parsing EDNS options in Lua
CVE-2026-0397 3.1 LOW Information disclosure via CORS misconfiguration
CVE-2026-0396 3.1 LOW HTML injection in the web dashboard

IV. Related Vulnerabilities

Same product: DNSdist
Same vendor: PowerDNS

V. Comments for CVE-2026-27853

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