diff --git a/meta-networking/recipes-support/strongswan/strongswan/CVE-2026-78129.patch b/meta-networking/recipes-support/strongswan/strongswan/CVE-2026-78129.patch
new file mode 100644
index 0000000000..5f327989a0
--- /dev/null
+++ b/meta-networking/recipes-support/strongswan/strongswan/CVE-2026-78129.patch
@@ -0,0 +1,155 @@
+From ec14a504137915cc45080323238c64d348d020eb Mon Sep 17 00:00:00 2001
+From: Tobias Brunner <tobias@strongswan.org>
+Date: Tue, 23 Jun 2026 11:55:31 +0200
+Subject: [PATCH] pkcs5: Validate parsed parameters to avoid DoS attacks
+
+With the unbounded iterations, an attacker can craft a PKCS#7 file and
+send it during IKEv1 to block the processing thread practically for an
+unlimited amount of time.
+
+As the key length is used for an allocation on the stack, not limiting
+it could cause a crash.  We validate it after parsing the params, but
+since `encryption_algorithm_from_oid()` only returns trusted key lengths
+that are lower than the limit, that's fine.
+
+The unlimited salt length had no direct impact (the maximum is bound by
+the accepted message size), but we now limit it as well before cloning.
+
+Fixes: 4076e3ee9121 ("Extract PKCS#5 handling from pkcs8 plugin to separate helper class")
+Fixes: fd1ff46f6143 ("Added support for PKCS#5 v2 schemes when decrypting PKCS#8 files.")
+Fixes: cab127cba66c ("Added support for encrypted PKCS#8 files (for some PKCS#5 v1.5 schemes).")
+Fixes: CVE-2026-78129
+
+CVE: CVE-2026-78129
+Upstream-Status: Backport [https://github.com/strongswan/strongswan/commit/f60a55e36f95e210ab067de295c9f6bacefcdd1a]
+
+Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
+---
+ src/libstrongswan/crypto/pkcs5.c | 65 +++++++++++++++++++++++++++++++-
+ 1 file changed, 64 insertions(+), 1 deletion(-)
+
+diff --git a/src/libstrongswan/crypto/pkcs5.c b/src/libstrongswan/crypto/pkcs5.c
+index 822656f..e01010b 100644
+--- a/src/libstrongswan/crypto/pkcs5.c
++++ b/src/libstrongswan/crypto/pkcs5.c
+@@ -14,6 +14,8 @@
+  * for more details.
+  */
+ 
++#include <inttypes.h>
++
+ #include "pkcs5.h"
+ 
+ #include <utils/debug.h>
+@@ -22,6 +24,15 @@
+ #include <asn1/asn1_parser.h>
+ #include <credentials/containers/pkcs12.h>
+ 
++/** maximum accepted length for salts in parsed parameters */
++#define PKCS5_SALT_LEN_MAX			128
++
++/** maximum accepted iteration count in parsed parameters */
++#define PKCS5_ITERATIONS_MAX		1000000
++
++/** maximum key length accepted in parsed parameters */
++#define PKCS5_KEY_LEN_MAX			64
++
+ typedef struct private_pkcs5_t private_pkcs5_t;
+ 
+ /**
+@@ -379,6 +390,41 @@ METHOD(pkcs5_t, decrypt, bool,
+ 						   keymat, key, iv);
+ }
+ 
++/**
++ * Make sure the salt has an appropriate length
++ */
++static bool validate_salt_length(chunk_t salt)
++{
++	if (salt.len > PKCS5_SALT_LEN_MAX)
++	{
++		DBG1(DBG_ASN, "  salt length %zu exceeds maximum of %zu bytes",
++			 salt.len, (size_t)PKCS5_SALT_LEN_MAX);
++		return FALSE;
++	}
++	return TRUE;
++}
++
++/**
++ * Validate that parsed parameters are in an allowed range
++ */
++static bool validate_params(private_pkcs5_t *this)
++{
++	if (!this->iterations || this->iterations > PKCS5_ITERATIONS_MAX)
++	{
++		DBG1(DBG_ASN, "  iteration count %" PRIu64 " is out of range "
++			 "(1-%" PRIu64 ")", this->iterations,
++			 (uint64_t)PKCS5_ITERATIONS_MAX);
++		return FALSE;
++	}
++	if (this->keylen > PKCS5_KEY_LEN_MAX)
++	{
++		DBG1(DBG_ASN, "  key length %zu exceeds maximum of %zu bytes",
++			 this->keylen, (size_t)PKCS5_KEY_LEN_MAX);
++		return FALSE;
++	}
++	return TRUE;
++}
++
+ /**
+  * ASN.1 definition of a PBEParameter structure
+  */
+@@ -399,7 +445,7 @@ static bool parse_pbes1_params(private_pkcs5_t *this, chunk_t blob, int level0)
+ 	asn1_parser_t *parser;
+ 	chunk_t object;
+ 	int objectID;
+-	bool success;
++	bool success = FALSE;
+ 
+ 	parser = asn1_parser_create(pbeParameterObjects, blob);
+ 	parser->set_top_level(parser, level0);
+@@ -410,6 +456,10 @@ static bool parse_pbes1_params(private_pkcs5_t *this, chunk_t blob, int level0)
+ 		{
+ 			case PBEPARAM_SALT:
+ 			{
++				if (!validate_salt_length(object))
++				{
++					goto end;
++				}
+ 				this->salt = chunk_clone(object);
+ 				break;
+ 			}
+@@ -421,6 +471,11 @@ static bool parse_pbes1_params(private_pkcs5_t *this, chunk_t blob, int level0)
+ 		}
+ 	}
+ 	success = parser->success(parser);
++	if (success)
++	{
++		success = validate_params(this);
++	}
++end:
+ 	parser->destroy(parser);
+ 	return success;
+ }
+@@ -471,6 +526,10 @@ static bool parse_pbkdf2_params(private_pkcs5_t *this, chunk_t blob, int level0)
+ 		{
+ 			case PBKDF2_SALT:
+ 			{
++				if (!validate_salt_length(object))
++				{
++					goto end;
++				}
+ 				this->salt = chunk_clone(object);
+ 				break;
+ 			}
+@@ -500,6 +559,10 @@ static bool parse_pbkdf2_params(private_pkcs5_t *this, chunk_t blob, int level0)
+ 		}
+ 	}
+ 	success = parser->success(parser);
++	if (success)
++	{
++		success = validate_params(this);
++	}
+ end:
+ 	parser->destroy(parser);
+ 	return success;
diff --git a/meta-networking/recipes-support/strongswan/strongswan_6.0.6.bb b/meta-networking/recipes-support/strongswan/strongswan_6.0.6.bb
index 2637c19d1e..c8f956f4d8 100644
--- a/meta-networking/recipes-support/strongswan/strongswan_6.0.6.bb
+++ b/meta-networking/recipes-support/strongswan/strongswan_6.0.6.bb
@@ -14,6 +14,7 @@ SRC_URI = "https://download.strongswan.org/strongswan-${PV}.tar.bz2 \
            file://CVE-2026-78124.patch \
            file://CVE-2026-78126.patch \
            file://CVE-2026-78127.patch \
+           file://CVE-2026-78129.patch \
 "
 
 SRC_URI[sha256sum] = "07df7cedae56a7f3bb07e66d21a1f9f87e961db70e99184e11d3819413e4f87c"