Moderate severityNVD Advisory· Published Mar 26, 2026· Updated Mar 27, 2026
Incus vulnerable to denial of source through crafted bucket backup file
CVE-2026-33743
Description
Incus is a system container and virtual machine manager. Prior to version 6.23.0, a specially crafted storage bucket backup can be used by an user with access to Incus' storage bucket feature to crash the Incus daemon. Repeated use of this attack can be used to keep the server offline causing a denial of service of the control plane API. This does not impact any running workload, existing containers and virtual machines will keep operating. Version 6.23.0 fixes the issue.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/lxc/incus/v6Go | < 6.23.0 | 6.23.0 |
github.com/lxc/incusGo | <= 0.7.0 | — |
Affected products
1Patches
14bca6332e822incusd/storage/s3: Don't assume backup structure
1 file changed · +4 −4
internal/server/storage/s3/transfer_manager.go+4 −4 modified@@ -7,6 +7,7 @@ import ( "net/http" "net/url" "os" + "strings" "time" "github.com/minio/minio-go/v7" @@ -130,13 +131,12 @@ func (t TransferManager) UploadAllFiles(bucketName string, srcData io.ReadSeeker break // End of archive. } - // Skip index.yaml file - if hdr.Name == "backup/index.yaml" { + // Skip anything that's not in the bucket itself. + if !strings.HasPrefix(hdr.Name, "backup/bucket/") { continue } - // Skip directories because they are part of the key of an actual file - fileName := hdr.Name[len("backup/bucket/"):] + fileName := strings.TrimPrefix(hdr.Name, "backup/bucket/") _, err = minioClient.PutObject(ctx, bucketName, fileName, tr, -1, minio.PutObjectOptions{}) if err != nil {
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
5- github.com/advisories/GHSA-vg76-xmhg-j5x3ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33743ghsaADVISORY
- github.com/lxc/incus/commit/4bca6332e8227a5f25f74b51a66b7382e9133aaaghsaWEB
- github.com/lxc/incus/releases/tag/v6.23.0ghsaWEB
- github.com/lxc/incus/security/advisories/GHSA-vg76-xmhg-j5x3ghsax_refsource_CONFIRMWEB
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