diff --git a/Misc/NEWS.d/next/Library/2025-04-04-16-22-03.gh-issue-132075.qMM5np.rst b/Misc/NEWS.d/next/Library/2025-04-04-16-22-03.gh-issue-132075.qMM5np.rst
new file mode 100644
index 00000000000000..691ea5897ae156
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-04-04-16-22-03.gh-issue-132075.qMM5np.rst
@@ -0,0 +1,2 @@
+Fix possible use of :mod:`socket` address structures with uninitialized
+members. Now all structure members are initialized with zeroes by default.
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 6e44a7ebfd10ae..8f66573d8629cb 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -1820,6 +1820,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
assert(path.len >= 0);
struct sockaddr_un* addr = &addrbuf->un;
+ memset(addr, 0, sizeof(struct sockaddr_un));
#ifdef __linux__
if (path.len == 0 || *(const char *)path.buf == 0) {
/* Linux abstract namespace extension:
@@ -1863,6 +1864,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
{
int pid, groups;
struct sockaddr_nl* addr = &addrbuf->nl;
+ memset(addr, 0, sizeof(struct sockaddr_nl));
if (!PyTuple_Check(args)) {
PyErr_Format(
PyExc_TypeError,
@@ -1890,6 +1892,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
{
unsigned int node, port;
struct sockaddr_qrtr* addr = &addrbuf->sq;
+ memset(addr, 0, sizeof(struct sockaddr_qrtr));
if (!PyTuple_Check(args)) {
PyErr_Format(
PyExc_TypeError,
@@ -1969,6 +1972,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
return 0;
}
struct sockaddr_in* addr = &addrbuf->in;
+ memset(addr, 0, sizeof(struct sockaddr_in));
result = setipaddr(s->state, host.buf, (struct sockaddr *)addr,
sizeof(*addr), AF_INET);
idna_cleanup(&host);
@@ -2014,6 +2018,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
return 0;
}
struct sockaddr_in6* addr = &addrbuf->in6;
+ memset(addr, 0, sizeof(struct sockaddr_in6));
result = setipaddr(s->state, host.buf, (struct sockaddr *)addr,
sizeof(*addr), AF_INET6);
idna_cleanup(&host);
@@ -2078,6 +2083,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
{
const char *straddr;
struct sockaddr_rc *addr = &addrbuf->bt_rc;
+ memset(addr, 0, sizeof(struct sockaddr_rc));
_BT_RC_MEMB(addr, family) = AF_BLUETOOTH;
#ifdef MS_WINDOWS
unsigned long channel;
@@ -2104,6 +2110,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
case BTPROTO_HCI:
{
struct sockaddr_hci *addr = &addrbuf->bt_hci;
+ memset(addr, 0, sizeof(struct sockaddr_hci));
#if defined(__NetBSD__) || defined(__DragonFly__)
const char *straddr;
_BT_HCI_MEMB(addr, family) = AF_BLUETOOTH;
@@ -2155,6 +2162,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
const char *straddr;
struct sockaddr_sco *addr = &addrbuf->bt_sco;
+ memset(addr, 0, sizeof(struct sockaddr_sco));
_BT_SCO_MEMB(addr, family) = AF_BLUETOOTH;
if (!PyBytes_Check(args)) {
PyErr_Format(PyExc_OSError,
@@ -2232,6 +2240,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
return 0;
}
struct sockaddr_ll* addr = &addrbuf->ll;
+ memset(addr, 0, sizeof(struct sockaddr_ll));
addr->sll_family = AF_PACKET;
addr->sll_protocol = htons((short)protoNumber);
addr->sll_ifindex = ifr.ifr_ifindex;
@@ -2318,6 +2327,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
struct ifreq ifr;
Py_ssize_t len;
struct sockaddr_can *addr = &addrbuf->can;
+ memset(addr, 0, sizeof(struct sockaddr_can));
if (!PyTuple_Check(args)) {
PyErr_Format(PyExc_TypeError,
@@ -2370,6 +2380,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
unsigned long int rx_id, tx_id;
struct sockaddr_can *addr = &addrbuf->can;
+ memset(addr, 0, sizeof(struct sockaddr_can));
if (!PyArg_ParseTuple(args, "O&kk", PyUnicode_FSConverter,
&interfaceName,
@@ -2417,6 +2428,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
uint8_t j1939_addr;
struct sockaddr_can *addr = &addrbuf->can;
+ memset(addr, 0, sizeof(struct sockaddr_can));
if (!PyArg_ParseTuple(args, "O&KIB", PyUnicode_FSConverter,
&interfaceName,
@@ -2469,6 +2481,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
case SYSPROTO_CONTROL:
{
struct sockaddr_ctl *addr = &addrbuf->ctl;
+ memset(addr, 0, sizeof(struct sockaddr_ctl));
addr->sc_family = AF_SYSTEM;
addr->ss_sysaddr = AF_SYS_CONTROL;
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