CVE-2026-56115
HIGHdhcpcd Stack Out-of-Bounds Write in dhcp6_makemessage()
Title source: cnaDescription
Bootimus through 0.1.70 contains a broken access control vulnerability that allows authenticated low-privileged users to perform administrative actions by exploiting missing role enforcement in the JWTMiddleware function in internal/auth/auth.go, which validates JWT tokens and account status but fails to inspect the is_admin flag. Attackers can send requests to any endpoint under the /api/users path to create new administrator accounts or reset administrator passwords, thereby gaining full control of the server and the ability to modify boot menus and installation scripts served to PXE clients.
References (4)
Core 4
Core References
Patch patch
https://github.com/NetworkConfiguration/dhcpcd/commit/2f00c7bfc408b6582d331932dfa47829c4819029
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/dhcpcd-stack-out-of-bounds-write-in-dhcp6-makemessage
Exploit technical-description
exploit
https://github.com/garybowers/bootimus/issues/84
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/bootimus-broken-access-control-via-jwtmiddleware-authorization-bypass
Scores
CVSS v3
8.8
EPSS
0.0030
EPSS Percentile
21.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-862
Status
published
Products (3)
garybowers/bootimus
< 0.1.70
NetworkConfiguration/dhcpcd
< 10.3.2
NetworkConfiguration/dhcpcd
2f00c7bfc408b6582d331932dfa47829c4819029
Published
Jun 23, 2026
Tracked Since
Jun 23, 2026