TI-2026-68038 Aliases CVE-2026-93315

Race condition in BuildKit CA cleanup lets build steps disrupt it

LOW 25CWE-367Published 2026-10-05 · Updated 2026-10-06

Key facts

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

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

Summary

BuildKit from 0.31.0 before 0.33.1 is affected when proxy networking with CA injection is enabled. A race condition (CWE-367) lets a build step modify its CA bundle before cleanup runs. The modification may cause cleanup to block, operate outside the build rootfs, or fail without failing the build. A local attacker with low privileges can trigger this, and the flaw has no known exploitation.

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

Description from the CNA

When proxy networking with CA injection is enabled, a build can modify its CA bundle before cleanup. This may cause cleanup to block, operate outside the build rootfs, or fail without failing the build.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00096 0th 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	0.31.0 to before 0.33.1	0.33.1	Patch available	CNA

BuildKit Vendormoby Affected 0.31.0 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 BuildKit to 0.33.1, which fixes the issue. Red Hat lists Red Hat Quay 3 as affected, with no plan 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-2026-67813 Container blob cache can accept unverified content in BuildKitPriority LOW 26
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

2026-10-06 Threatist record created from CVE-2026-93315
2026-10-06 CISA SSVC decision points changed
2026-10-06 Priority changed: MEDIUM → LOW
2026-10-20 Affected versions changed · Red Hat
2026-10-20 CVSS score added · 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-2f5p-x9ph-g97x

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