CVE-2026-56114
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.
- Affected products
- Dhcpcd
- Dhcpcd Project Dhcpcd
- ≤ 10.3.2
- Fix
- Available
- CVSS 3.1
- 6.5 MEDIUM
- EPSS
- 0.3% (19th percentile)
- Weakness
- CWE-787
- NVD status
- Analyzed
- Published
- 2026-06-23
No indexed exploits for CVE-2026-56114 yet
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