CVE-2026-90954 BusyBox - Path Traversal

BusyBox contains a path traversal caused by improper symlink flushing order in dpkg-deb archive extraction, letting attackers write arbitrary files outside the extraction directory, exploit requires crafted .deb archive.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.20% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Write, Data Tampering
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-59

Vendor fix

Update to the latest BusyBox version with the fix for dpkg-deb archive extraction.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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