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.
Metrics
Affected Vendors & Products
References
History
Tue, 23 Jun 2026 21:30:00 +0000
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Networkconfiguration
Networkconfiguration dhcpcd |
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Networkconfiguration
Networkconfiguration dhcpcd |
Tue, 23 Jun 2026 18:30:00 +0000
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ssvc
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Tue, 23 Jun 2026 16:45:00 +0000
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| Description | 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. | |
| Title | dhcpcd Stack Out-of-Bounds Write in dhcp6_makemessage() | |
| Weaknesses | CWE-787 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-06-23T17:08:40.406Z
Reserved: 2026-06-18T19:15:10.650Z
Link: CVE-2026-56115
Updated: 2026-06-23T17:08:36.867Z
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OpenCVE Enrichment
Updated: 2026-06-23T21:02:48Z