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

CVE-2026-27853

Out-of-bounds write when rewriting large DNS packets PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
PowerDNS / DNSdist	affected 1.9.0 before 1.9.12; affected 2.0.0 before 2.0.3

CWE

No CWE identifiers supplied.

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.