diff --git a/meta-oe/recipes-support/freerdp/freerdp3/CVE-2026-64620.patch b/meta-oe/recipes-support/freerdp/freerdp3/CVE-2026-64620.patch
new file mode 100644
index 0000000000..e154a92499
--- /dev/null
+++ b/meta-oe/recipes-support/freerdp/freerdp3/CVE-2026-64620.patch
@@ -0,0 +1,37 @@
+From c04d10f9586ce92d7a7a3307744e16d554e20cfd Mon Sep 17 00:00:00 2001
+From: Armin Novak <armin.novak@thincast.com>
+Date: Thu, 2 Jul 2026 08:02:26 +0200
+Subject: [PATCH] [crypto] fix out buffer check
+
+(cherry picked from commit 27014741a8c22a34d3040c559c82f4ed82841bef)
+
+CVE: CVE-2026-64620
+Upstream-Status: Backport [https://github.com/FreeRDP/FreeRDP/commit/27014741a8c22a34d3040c559c82f4ed82841bef]
+
+Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
+---
+ libfreerdp/crypto/crypto.c | 9 ++++++---
+ 1 file changed, 6 insertions(+), 3 deletions(-)
+
+diff --git a/libfreerdp/crypto/crypto.c b/libfreerdp/crypto/crypto.c
+index 3d210f2d9..60f7c6cee 100644
+--- a/libfreerdp/crypto/crypto.c
++++ b/libfreerdp/crypto/crypto.c
+@@ -103,11 +103,14 @@ static SSIZE_T crypto_rsa_common(const BYTE* input, size_t length, UINT32 key_le
+ 		goto fail;
+ 	if (BN_mod_exp(y, x, exp, mod, ctx) != 1)
+ 		goto fail;
+-	output_length = BN_bn2bin(y, output);
++	{
++		const int len = BN_num_bytes(y);
++		if ((len < 0) || (WINPR_ASSERTING_INT_CAST(size_t, len) > out_length))
++			goto fail;
++		output_length = BN_bn2bin(y, output);
++	}
+ 	if (output_length < 0)
+ 		goto fail;
+-	if (WINPR_ASSERTING_INT_CAST(size_t, output_length) > out_length)
+-		goto fail;
+ 	crypto_reverse(output, WINPR_ASSERTING_INT_CAST(size_t, output_length));
+ 
+ 	if ((size_t)output_length < key_length)
diff --git a/meta-oe/recipes-support/freerdp/freerdp3_3.24.2.bb b/meta-oe/recipes-support/freerdp/freerdp3_3.24.2.bb
index 86999ffe94..a577916bef 100644
--- a/meta-oe/recipes-support/freerdp/freerdp3_3.24.2.bb
+++ b/meta-oe/recipes-support/freerdp/freerdp3_3.24.2.bb
@@ -21,6 +21,7 @@ SRC_URI = "git://github.com/FreeRDP/FreeRDP.git;nobranch=1;protocol=https;tag=${
            file://CVE-2026-55648.patch \
            file://CVE-2026-63633.patch \
            file://CVE-2026-63652.patch \
+           file://CVE-2026-64620.patch \
 "