Read the docs
TI-2026-80082 Aliases CVE-2026-116013GHSA-879w-j376-3fgq

Denial of service in OpenResty lua-resty-dns via DNS response parsing

Priority LOW 28CWE-130Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

OpenResty lua-resty-dns before 0.24 contains improper input validation in parse_section() and _decode_name(), which do not check resource record lengths against the received message. An attacker controlling or spoofing a queried nameserver can send truncated record headers or RDATA, raising uncaught Lua exceptions in resolver:query(). The network attacker needs no privileges or user interaction, and the flaw aborts requests and breaks name resolution.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00288 21st percentileScored 2026-11-07
Fix Fixed lua-resty-dns (openresty): 0.24

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
openrestylua-resty-dnsbefore 0.240.24Patch availableCNA
  • lua-resty-dns Vendoropenresty Affected before 0.24 Fixed in 0.24 Patch available CNA

Remediation

Upgrade OpenResty lua-resty-dns to version 0.24.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA lua-resty-dns (openresty) Fixed in 0.24

Timeline

  1. 2026-10-24 Threatist record created from CVE-2026-116013
  2. 2026-10-24 Alias added: GHSA-879w-j376-3fgq
  3. 2026-10-25 Priority changed: MEDIUM → LOW
  4. 2026-10-29 CISA SSVC decision points changed

References

Patch 2

Other 2

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2024-22074 An issue in OpenResty lua-nginx-module v.0.10.26 and before allows a remote attacker to… CVSS 3.1HIGH 7.7
  • TI-2021-05876 A security issue in nginx resolver was identified, which might allow an attacker who is… CVSS 3.1HIGH 7.7
  • TI-2018-06684 In OpenResty through 1.13.6.1, URI parameters are obtained using the ngx.req.get_uri_args… CVSS 3.0CRITICAL 9.8
  • TI-2026-39910 OpenResty: Buffer overflow when writing PROXY protocol v2 header to upstream CVSS 3.1HIGH 7.5
  • TI-2020-09415 An issue was discovered in OpenResty before 1.15.8.4. CVSS 3.1HIGH 7.5
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences