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CVE-2026-27853

Out-of-bounds write when rewriting large DNS packets

Published: Mar 31, 2026Updated: Apr 14, 2026 Sources: CVE List NVDCWE-787
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.5%
Top 61.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-787

Affected Products

DNSdistPowerDNS
On-prem
Networking Infrastructure / dns-dhcp-ntp
dnsdistpowerdns
On-prem
Networking Infrastructure / dns-dhcp-ntp
powerdnsoss-projectDKNetworking Infrastructureaka powerdns recursor, powerdns authoritative, dnsdist

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html
dnsdist.org

Timeline

Published
Mar 31, 2026
Last Updated
Apr 14, 2026

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