TI-2026-67816 Aliases CVE-2026-93320

BuildKit mishandles special files in build snapshots

LOW 26CWE-441Published 2026-10-05 · Updated 2026-10-05

Key facts

Attack vector: Local
Privileges required: None
User interaction: Active
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

BuildKit from 0 through 0.33.0 is affected. BuildKit can be tricked into performing file actions on special file inodes where regular files are expected, a flaw classified as CWE-441. A local attacker with no privileges needs active user interaction, and the impact can block operations or, on rootful workers, allow unintended access to host devices.

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

Description from the CNA

BuildKit may be tricked into performing file actions with special file inodes where regular files are expected. Special files may block operations or, on rootful workers, allow unintended host device access.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00114 1st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

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

Vendor	Product	Affected versions	Fixed in	Status	Source
moby	BuildKit	up to 0.33.0	—	No fix listed	CNA

BuildKit Vendormoby Affected up to 0.33.0 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

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

CPE	Versions	Role	Vendor
cpe:2.3:a:mobyproject:buildkit::::::::	—	—	Mobyproject

cpe:2.3:a:mobyproject:buildkit:*:*:*:*:*:*:*:* Versions — — ·Mobyproject

Remediation

The sources list no fixed version for BuildKit.

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

Vendor assessments

Red Hat

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

Not affected: 2 products

Red Hat Hardened Images
Red Hat Quay 3

Timeline

2026-10-05 Threatist record created from CVE-2026-93320
2026-10-06 Affected versions changed · Red Hat
2026-10-06 CVSS score added · Red Hat
2026-10-07 Affected versions changed · Red Hat
2026-10-20 Affected versions changed · Red Hat
2026-10-21 Affected versions changed · Red Hat

References

Patch 1

https://github.com/moby/buildkit/releases/tag/v0.33.1

Advisory 1

https://github.com/moby/buildkit/security/advisories/GHSA-9728-qjrv-2xh2

TI-2026-14229 Tar extraction in moby/go-archive can write outside the destination directory via link following CVSS 4.0HIGH 7.1
TI-2021-12512 Moby HyperKit uninitialized memory use in virtio-sock pci_vtsock_proc_tx CVSS 3.1HIGH 7.1
TI-2024-27462 Moby authz zero length regression CVSS 3.1CRITICAL 10.0
TI-2024-15672 BuildKit interactive containers API does not validate entitlements check CVSS 3.1CRITICAL 9.8
TI-2024-15671 BuildKit possible host system access from mount stub cleaner CVSS 3.1CRITICAL 10.0
TI-2026-26365 Moby: AuthZ plugin bypass with oversized request body CVSS 3.1HIGH 8.8

See all 57 →

Sources

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