diff --git a/components/esp_libc/CMakeLists.txt b/components/esp_libc/CMakeLists.txt
index 5f3beec8a04..83fe92efe3d 100644
--- a/components/esp_libc/CMakeLists.txt
+++ b/components/esp_libc/CMakeLists.txt
@@ -77,7 +77,6 @@ else()
     list(APPEND srcs
          "src/picolibc/picolibc_init.c"
          "src/picolibc/rand.c"
-         "src/picolibc/open_memstream.c"
          "src/picolibc/errno.c"
          "src/picolibc/bufio_setvbuf.c") # TODO IDF-15494: remove this and the following lines
          list(APPEND EXTRA_LINK_FLAGS "-Wl,--wrap=__bufio_setvbuf")
diff --git a/components/esp_libc/src/picolibc/open_memstream.c b/components/esp_libc/src/picolibc/open_memstream.c
deleted file mode 100644
index 051a07b0d34..00000000000
--- a/components/esp_libc/src/picolibc/open_memstream.c
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-#include <stdio-bufio.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <errno.h>
-
-#define GET_BUF(mf) (*(mf->pbuf))
-#define GET_SIZE(mf) (*(mf->psize))
-
-struct __file_mem {
-    struct __file_ext xfile;
-    char    **pbuf;
-    size_t  *psize; // == strlen(*pbuf);
-    size_t  len;    // Total allocated size
-    size_t  pos;
-};
-
-static int __fmem_put(char c, FILE *f)
-{
-    struct __file_mem *mf = (struct __file_mem *) f;
-    if (mf->len == mf->pos) {
-        size_t newsize = mf->len * 3 / 2;
-        char *tmp = realloc(GET_BUF(mf), newsize);
-        if (!tmp) {
-            return _FDEV_ERR;
-        }
-        GET_BUF(mf) = tmp;
-        mf->len = newsize;
-    }
-    GET_BUF(mf)[mf->pos++] = c;
-    if (mf->pos > GET_SIZE(mf)) {
-        GET_SIZE(mf) = mf->pos;
-    }
-    return (unsigned char) c;
-}
-
-static int __fmem_get(FILE *f)
-{
-    struct __file_mem *mf = (struct __file_mem *) f;
-    int c;
-    if (mf->pos < GET_SIZE(mf)) {
-        c = (unsigned char) GET_BUF(mf)[mf->pos++];
-        if (c == '\0') {
-            c = _FDEV_EOF;
-        }
-    } else {
-        c = _FDEV_ERR;
-    }
-    return c;
-}
-
-static int __fmem_flush(FILE *f)
-{
-    struct __file_mem *mf = (struct __file_mem *) f;
-    GET_BUF(mf)[mf->pos] = '\0';
-    GET_SIZE(mf) = mf->pos;
-    return 0;
-}
-
-static off_t __fmem_seek(FILE *f, off_t pos, int whence)
-{
-    struct __file_mem *mf = (struct __file_mem *) f;
-
-    switch (whence) {
-    case SEEK_SET:
-        break;
-    case SEEK_CUR:
-        pos += mf->pos;
-        break;
-    case SEEK_END:
-        pos += GET_SIZE(mf);
-        break;
-    }
-    if (pos < 0 || GET_SIZE(mf) < (size_t) pos) {
-        return EOF;
-    }
-    mf->pos = pos;
-    return pos;
-}
-
-static int __fmem_close(FILE *f)
-{
-    __fmem_flush(f);
-    free(f);
-    return 0;
-}
-
-FILE *
-open_memstream(char **buf, size_t *size)
-{
-    struct __file_mem *mf;
-
-    if (!buf || !size) {
-        errno = EINVAL;
-        return NULL;
-    }
-    /* Allocate file structure and necessary buffers */
-    mf = calloc(1, sizeof(struct __file_mem));
-
-    if (mf == NULL) {
-        errno = ENOMEM;
-        return NULL;
-    }
-
-    *buf = malloc(BUFSIZ);
-    if (*buf == NULL) {
-        errno = ENOMEM;
-        free(mf);
-        return NULL;
-    }
-
-    *mf = (struct __file_mem) {
-        .xfile = FDEV_SETUP_EXT(__fmem_put, __fmem_get, __fmem_flush, __fmem_close,
-                                __fmem_seek, NULL, __SWR),
-                 .pbuf = buf,
-                 .psize = size,
-                 .len = BUFSIZ,
-                 .pos = 0,
-    };
-    *size = 0;
-    *buf[0] = '\0';
-    return (FILE *) mf;
-}
diff --git a/components/esp_libc/test_apps/newlib/main/CMakeLists.txt b/components/esp_libc/test_apps/newlib/main/CMakeLists.txt
index 09ead453fc0..845cd944aeb 100644
--- a/components/esp_libc/test_apps/newlib/main/CMakeLists.txt
+++ b/components/esp_libc/test_apps/newlib/main/CMakeLists.txt
@@ -3,7 +3,6 @@ set(srcs
     "test_atomic.c"
     "test_locks.c"
     "test_misc.c"
-    "test_memstream.c"
     "test_newlib.c"
     "test_printf.c"
     "test_setjmp.c"
diff --git a/components/esp_libc/test_apps/newlib/main/test_memstream.c b/components/esp_libc/test_apps/newlib/main/test_memstream.c
deleted file mode 100644
index 06d6e70b1ad..00000000000
--- a/components/esp_libc/test_apps/newlib/main/test_memstream.c
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
- *
- * SPDX-License-Identifier: Unlicense OR CC0-1.0
- */
-#include <stdlib.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-#include <assert.h>
-#include "test_utils.h"
-
-TEST_CASE("memstream_fseek", "[newlib]")
-{
-    FILE *stream;
-    char *buf;
-    size_t len;
-    off_t eob;
-
-    stream = open_memstream(&buf, &len);
-    fprintf(stream, "Hello Espressif!");
-    fflush(stream);
-    TEST_ASSERT_EQUAL_STRING("Hello Espressif!", buf);
-    TEST_ASSERT_EQUAL_UINT32(strlen("Hello Espressif!"), len);
-    eob = ftell(stream);
-    fseek(stream, 0, SEEK_SET);
-    fprintf(stream, "HELLO");
-    fseek(stream, eob, SEEK_SET);
-    fclose(stream);
-    TEST_ASSERT_EQUAL_STRING("HELLO Espressif!", buf);
-    TEST_ASSERT_EQUAL_UINT32(strlen("HELLO Espressif!"), len);
-    free(buf);
-}
-
-TEST_CASE("memstream_overwrite", "[newlib]")
-{
-    FILE *stream;
-    char *buf;
-    size_t len;
-
-    stream = open_memstream(&buf, &len);
-    fprintf(stream, "Hello Espressif!");
-    fflush(stream);
-    TEST_ASSERT_EQUAL_STRING("Hello Espressif!", buf);
-    TEST_ASSERT_EQUAL_UINT32(strlen("Hello Espressif!"), len);
-    fseek(stream, 0, SEEK_SET);
-    fprintf(stream, "HELLO");
-    fclose(stream);
-    TEST_ASSERT_EQUAL_STRING("HELLO", buf);
-    TEST_ASSERT_EQUAL_UINT32(strlen("HELLO"), len);
-    free(buf);
-}
-
-TEST_CASE("memstream_realloc", "[newlib]")
-{
-    FILE *stream;
-    char *buf;
-    size_t len;
-
-    stream = open_memstream(&buf, &len);
-    // Initial buf size is BUFSIZ. Try to go out of bounds.
-    for (int i = 0; i < BUFSIZ * 2; i++) {
-        fputc('A' + (i % ('Z' - 'A')), stream);
-    }
-    fclose(stream);
-    for (int i = 0; i < BUFSIZ * 2; i++) {
-        TEST_ASSERT_EQUAL_UINT32('A' + (i % ('Z' - 'A')), buf[i]);
-    }
-    free(buf);
-}