CVE-2026-75593: BuildKit: Malicious client can bypass destination directory validation on local sources upload

unknownCVE-2026-75593

CSIRTS triage

vendor: Docker product: BuildKit Path traversal

What: A malicious client can bypass destination directory validation when uploading local sources.
Who is affected: BuildKit instances accepting uploads from untrusted clients.
Urgency: Unknown severity; path traversal during build uploads could allow access to unintended files.
Action: Apply security update for CVE-2026-75593 when available and restrict BuildKit client access if possible.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-75593

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-755930.54% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-75593	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownCVE-2026-75593: BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressiv…nvd

Recent advisories for BuildKit

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

lowGHSA-72x6-4j93-7w86: BuildKit has a possible runtime DoS via unbounded group parsingghsa · 2026-08-19
mediumGHSA-7236-3392-c5c6: BuildKit: Custom frontend could bypass Seccomp/AppArmorghsa · 2026-08-19
unknownCVE-2026-75593: BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressiv…nvd · 2026-08-19
unknownCVE-2026-61712: BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressiv…nvd · 2026-08-19
unknownCVE-2026-61711: BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressiv…nvd · 2026-08-19
unknownCVE-2026-61712: BuildKit: Possible runtime DoS via unbounded group parsingmsrc · 2026-08-11