CVE-2026-33811CWE-1341CWE-415

CVE-2026-33811

High · published May 8, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
54.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00813 · 54.6th percentile
Weaknesses
CWE-1341 · Multiple Releases of Same Resource or Handle; CWE-415 · Double Free
Published
2026-05-08T00:16Z
Affected products (2)
ProductVersionsFixed in
golang/go< 1.25.101.25.10
golang/go≥ 1.26.0, < 1.26.31.26.3
References (125)
https://go.dev/cl/767860 · [email protected]https://go.dev/issue/78803 · [email protected]https://groups.google.com/g/golang-announce/c/qcCIEXso47M · [email protected]https://pkg.go.dev/vuln/GO-2026-4981 · [email protected]https://access.redhat.com/errata/RHSA-2026:22112 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22120 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22121 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:23262 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:23264 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33120 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33123 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33142 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33150 · 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0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2467822 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33811.json · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
EPSS history
Timeline
  • 07 MAY 19:41Z
    Crash when handling long CNAME response in net
    cvelistv5