CVE-2026-64194

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

20/07/2026

Last modified:

21/07/2026

Description

Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains.<br /> <br /> Net::DNS::DomainName::decode follows RFC 1035 compression pointers by recursing into itself with no depth limit. It is possible to construct a name which saturates the call stack (at least with larger TCP responses), leading to a potential Denial of Service.<br /> <br /> The guard `$link new(\$wire)` i.e. any point where the library decodes a DNS message from the network.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

7.50

Severity 3.x

HIGH

CVE-2026-64194

Description

Impact

References to Advisories, Solutions, and Tools