dhcpcd: dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_...
CVE-2026-56114 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-56114, released July 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.
dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dhcpcd · Debian 13.5 (trixie) | 1:10.1.0-11+deb13u3 | DEBIAN-CVE-2026-56114 | Jul 2, 2026 |
| dhcpcd · Debian 14 | 1:10.3.2-4 | DEBIAN-CVE-2026-56114 | Jul 2, 2026 |
| dhcpcd5 · Debian 12.15 (bookworm) | 9.4.1-24~deb12u5 | DEBIAN-CVE-2026-56114 | Jul 2, 2026 |
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