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TI-2026-71248 Aliases CVE-2026-95838GHSA-rp3h-jf77-q9p4

Repeated opaque whiteouts exhaust CPU in containerd layer unpack

Priority LOW 21CWE-400Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

containerd versions before 1.7.35, from 2.0.0-beta.0 before 2.0.12, from 2.2.0 before 2.2.8, and from 2.3.0 before 2.3.5 are affected. The layer unpack handler repeatedly traverses directories for certain opaque whiteout configurations, which is an uncontrolled resource consumption flaw (CWE-400). A malicious image layer can trigger the repeated traversals when pulled or imported, consuming CPU, delaying container startup, and reducing image-pull concurrency for unrelated deployments.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00223 12th percentileScored 2026-11-07
Fix Fixed containerd (containerd): 1.7.35, 2.0.12, 2.2.8 +1github.com/containerd/containerd/v2 (Go): 2.0.12, 2.2.8, 2.3.5+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
backstagecontainerdbefore 1.7.35; 2.0.0-beta.0 to before 2.0.12; 2.2.0 to before 2.2.8; 2.3.0 to before 2.3.51.7.35, 2.0.12, 2.2.8, 2.3.5Patch availableCNA
—github.com/containerd/containerd/v2 (Go)before 2.0.122.0.12Patch availableGHSA-rp3h-jf77-q9p4
—github.com/containerd/containerd (Go)before 1.7.351.7.35Patch availableGHSA-rp3h-jf77-q9p4
—github.com/containerd/containerd/v2 (Go)2.2.0 to before 2.2.82.2.8Patch availableGHSA-rp3h-jf77-q9p4
—github.com/containerd/containerd/v2 (Go)2.3.0 to before 2.3.52.3.5Patch availableGHSA-rp3h-jf77-q9p4
  • containerd Vendorbackstage Affected before 1.7.35; 2.0.0-beta.0 to before 2.0.12; 2.2.0 to before 2.2.8; 2.3.0 to before 2.3.5 Fixed in 1.7.35, 2.0.12, 2.2.8, 2.3.5 Patch available CNA
  • github.com/containerd/containerd/v2 (Go) Vendor— Affected before 2.0.12 Fixed in 2.0.12 Patch available GHSA-rp3h-jf77-q9p4
  • github.com/containerd/containerd (Go) Vendor— Affected before 1.7.35 Fixed in 1.7.35 Patch available GHSA-rp3h-jf77-q9p4
  • github.com/containerd/containerd/v2 (Go) Vendor— Affected 2.2.0 to before 2.2.8 Fixed in 2.2.8 Patch available GHSA-rp3h-jf77-q9p4
  • github.com/containerd/containerd/v2 (Go) Vendor— Affected 2.3.0 to before 2.3.5 Fixed in 2.3.5 Patch available GHSA-rp3h-jf77-q9p4

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:*——backstage
  • cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:* Versions — — ·backstage

Remediation

Upgrade containerd to 1.7.35, 2.0.12, 2.2.8, or 2.3.5, depending on the release branch in use.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA containerd (containerd) Fixed in 1.7.35, 2.0.12, 2.2.8, 2.3.5
  • Fix · GHSA-rp3h-jf77-q9p4 github.com/containerd/containerd/v2 (Go) Fixed in 2.0.12 Advisory →
  • Fix · GHSA-rp3h-jf77-q9p4 github.com/containerd/containerd (Go) Fixed in 1.7.35 Advisory →
  • Fix · GHSA-rp3h-jf77-q9p4 github.com/containerd/containerd/v2 (Go) Fixed in 2.2.8 Advisory →
  • Fix · GHSA-rp3h-jf77-q9p4 github.com/containerd/containerd/v2 (Go) Fixed in 2.3.5 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-95838
  2. 2026-10-13 CISA SSVC decision points changed
  3. 2026-10-16 Alias added: GHSA-rp3h-jf77-q9p4
  4. 2026-10-16 Fix available: Go/github.com/containerd/containerd/[email protected], Go/github.com/containerd/containerd/[email protected], Go/github.com/containerd/containerd/[email protected] +1 · GHSA-rp3h-jf77-q9p4
  5. 2026-10-16 CVSS score added · GHSA-rp3h-jf77-q9p4
  6. 2026-10-16 Weakness changed · GHSA-rp3h-jf77-q9p4
  7. 2026-10-16 4 new references · GHSA-rp3h-jf77-q9p4
  8. 2026-10-20 Affected versions changed · Red Hat
  9. 2026-10-20 CVSS score added · Red Hat

References

Advisory 1

Other 3

  • TI-2026-33119 Malware in 42 @tanstack/* packages exfiltrates cloud credentials, GitHub tokens, and SSH keys KEVCVSS 3.1CRITICAL 9.6
  • TI-2018-10499 Integer overflow in backstage kernel KEVCVSS 3.0HIGH 7.8
  • TI-2024-08998 Remote Code Execution in kedro-org/kedro CVSS 3.0CRITICAL 9.8
  • TI-2023-12294 Dragonfly2 vulnerable to hard coded cyptographic key CVSS 3.1CRITICAL 9.8
  • TI-2021-12074 Authentication vulnerability in MOSN v.0.23.0 allows attacker to escalate privileges via… CVSS 3.1CRITICAL 9.8
  • TI-2019-04061 runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows… CVSS 3.1HIGH 8.6
See all 662 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences