CVE-2026-15791: Docker crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory
This Docker advisory covers CVE-2026-15791 in BuildKit.
- CVE-2026-15791
Key facts
- Vendor rating
- Low, CVSS 1.8
- CISA KEV
- Not listed (catalogue checked )
- Affected
- BuildKit 0.10.0 before 0.31.2
- Fixed in
- 0.31.2
- Source published
- Source revised
- Listed by VulniPulse
- Record changed
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
A crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory. The action that can normally be used to delete files inside the build container rootfs can escape into the real host temp directory.
Text from the source record.
- BuildKit 0.10.0 before 0.31.2
NVD record · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-15791
Upgrade to a fixed release named by Docker:
- 0.31.2
Vendor guidance
- A crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory.
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