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Fencer Vulns
medium 4.6

CVE-2026-95838 json

containerd: Unpack DoS via repeated opaque whiteouts

published 2026-10-12 27 d ago modified 2026-10-19 20 d ago also EUVD-2026-97822 , GHSA-rp3h-jf77-q9p4 , GO-2026-6796

cvss
4.6
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

containerd is an open-source container runtime. Prior to 1.7.35, 2.0.12, 2.2.8, and 2.3.5, containerd's layer unpack handler repeatedly traverses directories for certain opaque whiteout configurations. A malicious image layer can trigger repeated directory traversals while opaque whiteouts are processed. Pulling or importing the image can consume CPU, delay container startup, and reduce image-pull concurrency for unrelated deployments. This issue is fixed in versions 1.7.35, 2.0.12, 2.2.8, and 2.3.5.

Patch / fix

  • go github.com/containerd/containerd/v2 2.0.12, 2.2.8, 2.3.5
  • go github.com/containerd/containerd 1.7.35
  • linuxfoundation containerd 1.7.35, 2.0.12, 2.2.8, 2.3.5
  • google-osconfig-agent Linux Micro 6.0 20261015.00-159998.1.1
  • containerd Linux Micro 6.1 1.7.29-slfo.1.1_5.1
  • containerd SLES LTSS Extended Security 12 SP5 1.7.29-16.119.1

suse advisories SUSE-SU-2026:4923-1SUSE-SU-2026:24374-1SUSE-SU-2026:24381-1

  • containerd openSUSE Tumbleweed 2.4.2-1.1
  • kubectl-retina openSUSE Tumbleweed 1.3.1-1.1
  • google-osconfig-agent openSUSE Tumbleweed 20261015.00-1.1

opensuse advisories openSUSE-SU-2026:12342-1openSUSE-SU-2026:12297-1openSUSE-SU-2026:12152-1

  • moby-containerd-cc Azure Linux 3.0 1.7.7-19
  • containerd2 Azure Linux 3.0 2.3.7-1

azure linux advisories AZL-108008AZL-108068

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-95838 updated cvss 3.3

github.com/containerd/containerd: containerd: Denial of Service via repeated directory traversals during layer unpacking

  • Red Hat Hardened Images git-sync 4.7.1-0.1.hum1
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
26 d ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 4.6 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA 4.0 4.6 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
go github.com/containerd/containerd/v2
<2.0.12
>=2.2.0, <2.2.8
>=2.3.0, <2.3.5
2.0.12
2.2.8
2.3.5
go github.com/containerd/containerd
<1.7.35
1.7.35

Affected products

  • containerd containerd

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-407 Inefficient Algorithmic Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.