ALPINE-CVE-2026-56113
dhcpcd through 10.3.2, fixed in commit 5733d3c, contains a heap use-after-free vulnerability that allows unauthenticated same-link attackers to crash the daemon by sending a crafted DHCPv6 RENEW reply with RFC6603 OPTION_PD_EXCLUDE and both preferred and valid lifetimes set to zero. Attackers acting as or impersonating a DHCPv6 server can trigger dhcp6_deprecatedele() to free a delegated child address while an outer TAILQ_FOREACH_SAFE iterator in dhcp6_deprecateaddrs() still holds the freed pointer, causing a use-after-free when TAILQ_REMOVE is reached.
ALPINE-CVE-2026-56113
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:ALPINE-CVE-2026-56113
dhcpcd
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 10.5.2-r0
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
dhcpcd
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 10.5.2-r0
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "10.5.2-r0"
}
]
}
],
"package": {
"name": "dhcpcd",
"purl": "pkg:apk/alpine/dhcpcd?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-56113.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "10.5.2-r0"
}
]
}
],
"package": {
"name": "dhcpcd",
"purl": "pkg:apk/alpine/dhcpcd?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-56113.json"
},
"ecosystem_specific": {}
}
]Publisher severity
No explicit severity was provided.
- Event
- #54540 · Revision 1
- Added to Heist Feed
- Publisher date