openresty lua-resty-dns up to 0.23 DNS Parser parse_section/_decode_name input validation

Summaryinfo

A vulnerability has been found in openresty lua-resty-dns up to 0.23 and classified as critical. Affected by this vulnerability is the function parse_section/_decode_name of the component DNS Parser. The manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-116013. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in openresty lua-resty-dns up to 0.23. This issue affects the function parse_section/_decode_name of the component DNS Parser. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

OpenResty lua-resty-dns before 0.24 contains an improper input validation vulnerability in parse_section() and _decode_name() that fails to check resource record lengths against the received message. Attackers controlling or spoofing a queried nameserver can send truncated record headers or RDATA, raising uncaught Lua exceptions in resolver:query() that abort requests and break name resolution.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-116013 since 10/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.24 eliminates this vulnerability.

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Productinfo

Vendor

• openresty

Name

• lua-resty-dns

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23

Website

• Product: https://github.com/openresty/lua-resty-dns/

CPE 2.3info

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CPE 2.2info

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