CVE-2026-77763: juicedata juicefs

JuiceFS Local Filestore Backend Joins Object Keys onto the Storage Root Without a Containment Check, Allowing Writes Outside the Configured Directory

CVSS 7.1 HighEPSS 0.0050 · 42nd percentile

Published by the CVE Program (CNA: VulnCheck) at 21 Aug 2026, 11:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
juicedata	juicefs Package name: github.com/juicedata/juicefs https://proxy.golang.org pkg:golang/github.com/juicedata/juicefs	affected 1.4.1 and earlier semver Other versions: unaffected

Identifiers

CVE-2026-77763

CNA

VulnCheck

Weakness (CWE)

CWE-22

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.5	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N	CNA (VulnCheck)
7.1	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record

CISA KEV Not listed.
EPSS 0.0050, the 42nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 21 Aug 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/juicedata/juicefs/issues/7401 issue-tracking
github.com/juicedata/juicefs/commit/0bcd70b3d13088d38127d6fb5750c91be7c4ec16 patch
github.com/juicedata/juicefs/pull/7425 issue-tracking
github.com/juicedata/juicefs/blob/v1.4.1/pkg/object/file.go technical-description
github.com/juicedata/juicefs product
www.vulncheck.com/advisories/juicefs-local-filestore-backend-joins-object-keys-onto-the-storage-root-without-a-containment-check-allowing-writes-outside-the-configured-directory third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.