TI-2026-67813 Aliases CVE-2026-93317

Container blob cache can accept unverified content in BuildKit

LOW 26CWE-354Published 2026-10-05 · Updated 2026-10-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: Active
Attack complexity: Low
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

Moby BuildKit from 0.28.0 before 0.33.1 accepts blob contents that do not match their claimed digest (CWE-354). An unauthenticated attacker who controls a registry or OCI-layout blob source can supply such content. BuildKit caches it under that digest, and a later victim build reuses it, which compromises build-input integrity.

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

Description from the CNA

An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents that did not match the claimed digest. The resulting snapshot could be cached under that digest and reused by a later victim build, compromising build-input integrity.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00162 5th percentileScored 2026-11-07

Fix Partial BuildKit (moby): 0.33.1Red Hat: 1 without a fix

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	0.28.0 to before 0.33.1	0.33.1	Patch available	CNA

BuildKit Vendormoby Affected 0.28.0 to before 0.33.1 Fixed in 0.33.1 Patch available 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

Upgrade Moby BuildKit to 0.33.1, the first fixed version. Red Hat lists Red Hat Quay 3 as affected with no fix available.

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

Fix · CNA BuildKit (moby) Fixed in 0.33.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-05
moby BuildKit 0.33.1
4 records Highest priority Priority LOW 4 LOW
Other records, highest priority first
- TI-2026-67814 Cache poisoning in BuildKit via unvalidated image layer DiffIDsPriority LOW 34
- TI-2026-67812 BuildKit panics on CDI device builds if started with --cdi-disabledPriority LOW 31
- TI-2026-68038 Race condition in BuildKit CA cleanup lets build steps disrupt itPriority LOW 25
Show all 4 records →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Quay 3	Affected	No fix yet: Fix deferred

Not affected: 1 product

Red Hat Hardened Images

Timeline

2026-10-05 Threatist record created from CVE-2026-93317
2026-10-05 CISA SSVC decision points changed
2026-10-05 Priority changed: MEDIUM → LOW
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

References

Patch 1

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

Advisory 1

https://github.com/moby/buildkit/security/advisories/GHSA-p3rc-w3hc-pqvv

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