CVE-2026-33811
Vulnerability Summary
Timeline
Description
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
CVSS Metrics
- v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Trends
Current EPSS score: 0.81%• Percentile: 55%
Techniques & Countermeasures
- CWE-415•Double Free
The product calls free() twice on the same memory address.
- CWE-1341•Multiple Releases of Same Resource or Handle
The product attempts to close or release a resource or handle more than once, without any successful open between the close operations.
Affected Systems
- chainguard•aactl
< 0.4.12-r51 | < 0.4.12-r50
- chainguard•act
< 0
- chainguard•actions-runner-controller-fips
< 0.14.1-r2 | < 0.14.1-r1 | < 0
- chainguard•addon-resizer
< 0
- chainguard•addon-resizer-fips
< 0
- chainguard•age-fips
< 1.3.1-r7 | < 0
- chainguard•agentbeat
< 9.2.7-r7
- chainguard•agentbeat-fips
< 9.2.7-r6 | < 9.2.7-r7
- chainguard•amazon-cloudwatch-agent
< 1.300067.0-r2 | < 1.300067.0-r3
- chainguard•amazon-cloudwatch-agent-amazon-cloudwatch-agent-config-wizard
< 0
- chainguard•amazon-cloudwatch-agent-amazon-cloudwatch-agent-config-wizard-fips
< 0
- chainguard•amazon-cloudwatch-agent-config-downloader
< 0
- chainguard•amazon-cloudwatch-agent-config-downloader-fips
< 0
- chainguard•amazon-cloudwatch-agent-config-translator
< 0
- chainguard•amazon-cloudwatch-agent-config-translator-fips
< 0
- chainguard•amazon-cloudwatch-agent-operator
< 3.4.2-r2
- chainguard•amazon-cloudwatch-agent-operator-fips
< 3.4.2-r1
- chainguard•amazon-cloudwatch-agent-start-amazon-cloudwatch-agent
< 0
- chainguard•amazon-cloudwatch-agent-start-amazon-cloudwatch-agent-fips
< 0
- chainguard•amazon-ecs-agent-fips
< 1.103.0-r1 | < 1.103.0-r0
- chainguard•amazon-ecs-cni-plugins-fips
< 0 | < 2024.9.0_git20260306-r2
- chainguard•amazon-eks-ami
< 20260318-r5
- chainguard•amazon-eks-ami-fips
< 20260318-r3
- chainguard•amazon-k8s-cni
< 1.21.1-r6 | < 1.21.1-r7
- chainguard•amazon-k8s-cni-fips
< 1.21.1-r6
- chainguard•amazon-k8s-cni-init
< 0
- chainguard•amazon-k8s-cni-init-fips
< 0
- chainguard•amazon-k8s-cni-init-fips-compat
< 1.21.1-r6 | < 0
- chainguard•amazon-ssm-agent
< 0 | < 3.3.3270.0-r14
- chainguard•amazon-ssm-agent-ecs-exec
< 0 | < 3.3.3270.0-r14
- chainguard•amazon-ssm-agent-ecs-exec-fips
< 3.3.3270.0-r15 | < 0 | < 3.3.3270.0-r16
- chainguard•amazon-ssm-agent-fips
< 0 | < 3.3.3270.0-r16
- chainguard•amazon-vpc-cni-plugins-fips
< 1.3_git20260307-r1 | < 0
- chainguard•ansible-operator
< 1.42.2-r5 | < 1.42.2-r4
- chainguard•ansible-operator-fips
< 1.42.2-r5
- chainguard•apache-exporter
< 0
- chainguard•apko
< 1.2.11-r2 | < 1.2.11-r1
- chainguard•apko-fips
< 1.2.10-r0 | < 1.2.10-r1
- chainguard•apm-server-fips-8.19
< 8.19.15-r4
- chainguard•apm-server-fips-9.1
< 9.1.10-r7
- chainguard•apm-server-fips-9.2
< 9.2.8-r3 | < 9.2.8-r2
- chainguard•apm-server-fips-9.3
< 9.3.4-r0
- chainguard•apm-server-fips-9.4
< 9.4.0-r1
- chainguard•argo-cd-3.3-compat
< 3.3.9-r2
- chainguard•argo-cd-fips-3.0
< 3.0.23-r7
- chainguard•argo-cd-fips-3.0-compat
< 3.0.23-r7
- chainguard•argo-cd-fips-3.1
< 3.1.16-r1
- chainguard•argo-cd-fips-3.1-compat
< 3.1.16-r1
- chainguard•argo-cd-fips-3.2
< 3.2.11-r1 | < 3.2.11-r2
- chainguard•argo-cd-fips-3.2-compat
< 3.2.11-r1
Showing first 50 affected entries in server-rendered view.
References (144)
- https://go.dev/issue/78803
- https://go.dev/cl/767860
- https://groups.google.com/g/golang-announce/c/qcCIEXso47M
- https://pkg.go.dev/vuln/GO-2026-4981
- https://access.redhat.com/security/cve/CVE-2026-33811
- https://bugzilla.redhat.com/show_bug.cgi?id=2467822
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33811.json
- https://access.redhat.com/errata/RHSA-2026:23262
- https://access.redhat.com/errata/RHSA-2026:23264
- https://access.redhat.com/errata/RHSA-2026:33120
- https://access.redhat.com/errata/RHSA-2026:33123
- https://access.redhat.com/errata/RHSA-2026:33142
- https://access.redhat.com/errata/RHSA-2026:33150
- https://access.redhat.com/errata/RHSA-2026:35832
- https://access.redhat.com/errata/RHSA-2026:34357
- https://access.redhat.com/errata/RHSA-2026:36617
- https://access.redhat.com/errata/RHSA-2026:34359
- https://access.redhat.com/errata/RHSA-2026:34364
- https://access.redhat.com/errata/RHSA-2026:36625
- https://access.redhat.com/errata/RHSA-2026:36207
- https://access.redhat.com/errata/RHSA-2026:36319
- https://access.redhat.com/errata/RHSA-2026:33574
- https://access.redhat.com/errata/RHSA-2026:36648
- https://access.redhat.com/errata/RHSA-2026:35994
- https://access.redhat.com/errata/RHSA-2026:35993
- https://access.redhat.com/errata/RHSA-2026:35995
- https://access.redhat.com/errata/RHSA-2026:36796
- https://access.redhat.com/errata/RHSA-2026:36776
- https://access.redhat.com/errata/RHSA-2026:36651
- https://access.redhat.com/errata/RHSA-2026:36797
- https://access.redhat.com/errata/RHSA-2026:38504
- https://access.redhat.com/errata/RHSA-2026:41019
- https://access.redhat.com/errata/RHSA-2026:39810
- https://access.redhat.com/errata/RHSA-2026:39272
- https://access.redhat.com/errata/RHSA-2026:39573
- https://access.redhat.com/errata/RHSA-2026:39266
- https://access.redhat.com/errata/RHSA-2026:39319
- https://access.redhat.com/errata/RHSA-2026:41030
- https://access.redhat.com/errata/RHSA-2026:40945
- https://access.redhat.com/errata/RHSA-2026:40118
- https://access.redhat.com/errata/RHSA-2026:41055
- https://access.redhat.com/errata/RHSA-2026:40119
- https://access.redhat.com/errata/RHSA-2026:42079
- https://access.redhat.com/errata/RHSA-2026:42078
- https://access.redhat.com/errata/RHSA-2026:42082
- https://access.redhat.com/errata/RHSA-2026:42150
- https://access.redhat.com/errata/RHSA-2026:42151
- https://access.redhat.com/errata/RHSA-2026:42240
- https://access.redhat.com/errata/RHSA-2026:42132
- https://access.redhat.com/errata/RHSA-2026:41928
- https://access.redhat.com/errata/RHSA-2026:42644
- https://access.redhat.com/errata/RHSA-2026:42043
- https://access.redhat.com/errata/RHSA-2026:42047
- https://access.redhat.com/errata/RHSA-2026:42050
- https://access.redhat.com/errata/RHSA-2026:42051
- https://access.redhat.com/errata/RHSA-2026:42049
- https://access.redhat.com/errata/RHSA-2026:42048
- https://access.redhat.com/errata/RHSA-2026:54191
- https://access.redhat.com/errata/RHSA-2026:50319
- https://access.redhat.com/errata/RHSA-2026:50336
- https://access.redhat.com/errata/RHSA-2026:48151
- https://access.redhat.com/errata/RHSA-2026:49703
- https://access.redhat.com/errata/RHSA-2026:53413
- https://access.redhat.com/errata/RHSA-2026:54168
- https://access.redhat.com/errata/RHSA-2026:51187
- https://access.redhat.com/errata/RHSA-2026:42946
- https://access.redhat.com/errata/RHSA-2026:53412
- https://access.redhat.com/errata/RHSA-2026:53415
- https://access.redhat.com/errata/RHSA-2026:50843
- https://access.redhat.com/errata/RHSA-2026:47952
- https://access.redhat.com/errata/RHSA-2026:47149
- https://access.redhat.com/errata/RHSA-2026:53530
- https://access.redhat.com/errata/RHSA-2026:51033
- https://access.redhat.com/errata/RHSA-2026:43692
- https://access.redhat.com/errata/RHSA-2026:51057
- https://access.redhat.com/errata/RHSA-2026:50300
- https://access.redhat.com/errata/RHSA-2026:43038
- https://access.redhat.com/errata/RHSA-2026:54287
- https://access.redhat.com/errata/RHSA-2026:54285
- https://access.redhat.com/errata/RHSA-2026:54283
- https://access.redhat.com/errata/RHSA-2026:50205
- https://access.redhat.com/errata/RHSA-2026:51341
- https://access.redhat.com/errata/RHSA-2026:51194
- https://access.redhat.com/errata/RHSA-2026:42852
- https://access.redhat.com/errata/RHSA-2026:44622
- https://access.redhat.com/errata/RHSA-2026:46885
- https://access.redhat.com/errata/RHSA-2026:47735
- https://access.redhat.com/errata/RHSA-2026:54500
- https://access.redhat.com/errata/RHSA-2026:54441
- https://access.redhat.com/errata/RHSA-2026:54284
- https://access.redhat.com/errata/RHSA-2026:54286
- https://access.redhat.com/errata/RHSA-2026:54274
- https://access.redhat.com/errata/RHSA-2026:54435
- https://access.redhat.com/security/updates/classification/#important
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_36617.json
- https://www.cve.org/CVERecord?id=CVE-2026-33811
- https://nvd.nist.gov/vuln/detail/CVE-2026-33811
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_36776.json
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_39266.json
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_39272.json
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_39319.json
- https://security-tracker.debian.org/tracker/CVE-2026-33811
- https://access.redhat.com/errata/RHSA-2026:54757
- https://access.redhat.com/errata/RHSA-2026:54552
- https://access.redhat.com/errata/RHSA-2026:56340
- https://access.redhat.com/errata/RHSA-2026:57191
- https://access.redhat.com/errata/RHSA-2026:54556
- https://access.redhat.com/errata/RHSA-2026:54584
- https://access.redhat.com/errata/RHSA-2026:54603
- https://access.redhat.com/errata/RHSA-2026:54602
- https://access.redhat.com/errata/RHSA-2026:57194
- https://access.redhat.com/errata/RHSA-2026:49702
- https://access.redhat.com/errata/RHSA-2026:22120
- https://access.redhat.com/errata/RHSA-2026:22112
- https://access.redhat.com/errata/RHSA-2026:57649
- https://access.redhat.com/errata/RHSA-2026:49712
- https://access.redhat.com/errata/RHSA-2026:22121
- https://access.redhat.com/errata/RHSA-2026:59467
- https://access.redhat.com/errata/RHSA-2026:56790
- https://access.redhat.com/errata/RHSA-2026:56789
- https://access.redhat.com/errata/RHSA-2026:59559
- https://access.redhat.com/errata/RHSA-2026:56785
- https://access.redhat.com/errata/RHSA-2026:56910
- https://access.redhat.com/errata/RHSA-2026:56852
- https://access.redhat.com/errata/RHSA-2026:57482
- https://access.redhat.com/errata/RHSA-2026:56913
- https://access.redhat.com/errata/RHSA-2026:56912
- https://access.redhat.com/errata/RHSA-2026:56855
- https://access.redhat.com/errata/RHSA-2026:57488
- https://access.redhat.com/errata/RHSA-2026:60302
- https://access.redhat.com/errata/RHSA-2026:60520
- https://access.redhat.com/errata/RHSA-2026:61313
- https://access.redhat.com/errata/RHSA-2026:61253
- https://access.redhat.com/errata/RHSA-2026:60025
- https://access.redhat.com/errata/RHSA-2026:60018
- https://pkg.go.dev
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33811.json
- https://access.redhat.com/errata/RHSA-2026:65534
- https://access.redhat.com/errata/RHSA-2026:65886
- https://access.redhat.com/errata/RHSA-2026:65126
- https://access.redhat.com/errata/RHSA-2026:66022
- https://access.redhat.com/errata/RHSA-2026:67149
- https://access.redhat.com/errata/RHSA-2026:67319
- https://access.redhat.com/errata/RHSA-2026:67287