CVE-2026-3608

DHCP implementation from Internet Systems Consortium, Inc. that features fully functional DHCPv4, DHCPv6 and Dynamic DNS servers. Both DHCP servers fully support server discovery, address assignment, renewal, rebinding and release. The DHCPv6 server supports prefix delegation. Both servers support DNS Update mechanism, using stand-alone DDNS daemon.

Security Fix(es):

• Kea: Kea: Denial of Service via maliciously crafted message (CVE-2026-3608)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Sending a maliciously crafted message to the kea-ctrl-agent, kea-dhcp-ddns, kea-dhcp4, or kea-dhcp6 daemons over any configured API socket or HA listener can cause the receiving daemon to exit with a stack overflow error. This issue affects Kea versions 2.6.0 through 2.6.4 and 3.0.0 through 3.0.2.

DHCP implementation from Internet Systems Consortium, Inc. that features fully functional DHCPv4, DHCPv6 and Dynamic DNS servers. Both DHCP servers fully support server discovery, address assignment, renewal, rebinding and release. The DHCPv6 server supports prefix delegation. Both servers support DNS Update mechanism, using stand-alone DDNS daemon.

Security Fix(es):

• Kea: Kea: Denial of Service via maliciously crafted message (CVE-2026-3608)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

These are all security issues fixed in the kea-3.0.3-1.1 package on the GA media of openSUSE Tumbleweed.

This update for kea fixes the following issues:

Update to 3.0.3:

• CVE-2025-11232: invalid characters cause assert (bsc#1252863).
• CVE-2026-3608: stack overflow via maliciously crafted message (bsc#1260380).

Changelog:

• A large number of bracket pairs in a JSON payload directed to any endpoint would result in a stack overflow, due to recursive calls when parsing the JSON. This has been fixed. (CVE-2026-3608) [bsc#1260380]
• When a hostname or FQDN received from a client is reduced to an empty string by hostname sanitizing, kea-dhcp4 and kea-dhcp6 will now drop the option. (CVE-2025-11232) [bsc#1252863]
• A null dereference is now no longer possible when configuring the Control Agent with a socket that lacks the mandatory socket-name entry.
• UNIX sockets are now created as group-writable.
• Removed logging an error in ping check hook library if using lease cache treshold.
• Fixed deadlock in ping-check hooks library.
• Fixed a data race in ping-check hooks library.

This update for kea fixes the following issues:

Update to release 2.6.5:

• A large number of bracket pairs in a JSON payload directed to any endpoint would result in a stack overflow, due to recursive calls when parsing the JSON. This has been fixed. (CVE-2026-3608) [bsc#1260380]
• A null dereference is now no longer possible when configuring the Control Agent with a socket that lacks the mandatory socket-name entry.
• UNIX sockets are now created as group-writable.
• Corrected an issue in logging configuration when parsing 'syslog:'
• Earlier Kea versions could crash when handling misconfigured global reservations. This has been fixed.
• Support for recent versions of Sphinx has been added.

This update for kea fixes the following issues:

Update to release 2.6.5.

Security issues fixed:

• CVE-2026-3608: stack overflow error via specially crafted message to the kea-ctrl-agent, kea-dhcp-ddns, kea-dhcp4, or kea-dhcp6 daemons(bsc#1260380).

Other updates and bugfixes:

• A null dereference is now no longer possible when configuring the Control Agent with a socket that lacks the mandatory socket-name entry.
• UNIX sockets are now created as group-writable.
• Corrected an issue in logging configuration when parsing 'syslog:'.
• Fixed crash when handling misconfigured global reservations.
• Support for recent versions of Sphinx has been added.

This update for kea fixes the following issues:

Update to 3.0.3:

• CVE-2025-11232: invalid characters cause assert (bsc#1252863).
• CVE-2026-3608: stack overflow via maliciously crafted message (bsc#1260380).

Changelog:

• A large number of bracket pairs in a JSON payload directed to any endpoint would result in a stack overflow, due to recursive calls when parsing the JSON. This has been fixed. (CVE-2026-3608) [bsc#1260380]
• When a hostname or FQDN received from a client is reduced to an empty string by hostname sanitizing, kea-dhcp4 and kea-dhcp6 will now drop the option. (CVE-2025-11232) [bsc#1252863]
• A null dereference is now no longer possible when configuring the Control Agent with a socket that lacks the mandatory socket-name entry.
• UNIX sockets are now created as group-writable.
• Removed logging an error in ping check hook library if using lease cache treshold.
• Fixed deadlock in ping-check hooks library.
• Fixed a data race in ping-check hooks library.

Ali Norouzi discovered that Kea DHCP did not properly handle maliciously crafted messages over configured API sockets and HA listeners. A remote attacker could possibly use this issue to cause Kea DHCP to crash, resulting in a denial of service.