Vulnerability

CVE-2026-33811

High· 7.5CVSS7.5EPSS0%

.rules3/5

Crash when handling long CNAME response in net

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

Threat signal

75/100

High

Severity

high

CVSS

7.5

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

7.5/ 10HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactNoneNo confidentiality impact.
Integrity ImpactNoneNo integrity impact.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.02%

probability of exploitation in next 30 days

higher than 5% of all CVEs

3-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-33811. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCTrack

Total impact on non-trivial mission systems

exploitation: none
automatable: no
impact: total
mission: support

Lifecycle

2026-05-07Published
2026-05-12Last modified2 sources
2026-05-26Vendor advisory · amazon-linuxAL2-ALAS2ECS-2026-116-(important):-containerd — ALAS2ECS-2026-116 (important): containerd
2026-05-26Vendor advisory · amazon-linuxAL2-ALAS2DOCKER-2026-125-(important):-runc — ALAS2DOCKER-2026-125 (important): runc
2026-05-26Vendor advisory · amazon-linuxAL2-ALAS2DOCKER-2026-119-(important):-docker — ALAS2DOCKER-2026-119 (important): docker
2026-06-08Vendor advisory · amazon-linuxALAS2-2026-3323 — ALAS2-2026-3323 (important): amazon-cloudwatch-agent
2026-06-08Vendor advisory · amazon-linuxAL2-ALAS2ECS-2026-120-(important):-ecs-init — ALAS2ECS-2026-120 (important): ecs-init

Entity graph

7 nodes · 6 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

References

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.