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CVE PROGRAM SOURCE RECORD5.9 Medium

CVE-2026-27853

Out-of-bounds write when rewriting large DNS packets

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
OX

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

PowerDNS DNSdist

Default version status: unaffected

  • 1.9.0 to < 1.9.12affected
  • 2.0.0 to < 2.0.3affected

References