unbound: patch CVE-2026-55717

Details:
https://nvd.nist.gov/vuln/detail/cve-2026-55717

Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>

meta-networking/recipes-support/unbound/unbound/CVE-2026-55717.patch

@@ -0,0 +1,90 @@
+From ff034061b24642e15340b0696e5c9a0aa8410fab Mon Sep 17 00:00:00 2001
+From: "W.C.A. Wijngaards" <wouter@nlnetlabs.nl>
+Date: Wed, 22 Jul 2026 10:17:32 +0200
+Subject: [PATCH] - Fix CVE-2026-55717, 'serve-expired-client-timeout' and
+ 'response-ip'   CNAME redirect could lead to a crash. Thanks to Qifan Zhang,
+ Palo   Alto Networks, for the report. In addition, thanks to Xin Wang,  
+ Jiapeng Li, and Jiajia Liu, Northwestern Polytechnical University,   for also
+ reporting this issue.
+
+(cherry picked from commit 2ce2ca36912644d2dbf97249a41494a9e2500fc3)
+
+CVE: CVE-2026-55717
+Upstream-Status: Backport [https://github.com/NLnetLabs/unbound/commit/2ce2ca36912644d2dbf97249a41494a9e2500fc3]
+
+Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
+---
+ services/localzone.h     |  2 +-
+ services/mesh.c          | 15 ++++++++++-----
+ util/data/packed_rrset.c |  1 +
+ 3 files changed, 12 insertions(+), 6 deletions(-)
+
+diff --git a/services/localzone.h b/services/localzone.h
+index 66102fd98..9ec57e2a1 100644
+--- a/services/localzone.h
++++ b/services/localzone.h
+@@ -565,7 +565,7 @@ enum respip_action {
+ 	respip_always_nxdomain = local_zone_always_nxdomain,
+         /** answer with nodata response */
+ 	respip_always_nodata = local_zone_always_nodata,
+-        /** answer with nodata response */
++        /** drop query */
+ 	respip_always_deny = local_zone_always_deny,
+ 	/** RPZ: truncate answer in order to force switch to tcp */
+ 	respip_truncate = local_zone_truncate,
+diff --git a/services/mesh.c b/services/mesh.c
+index 6a04bc838..191b1d488 100644
+--- a/services/mesh.c
++++ b/services/mesh.c
+@@ -2391,9 +2391,10 @@ apply_respip_action(struct module_qstate* qstate,
+ 
+ 	/* xxx_deny actions mean dropping the reply, unless the original reply
+ 	 * was redirected to response-ip data. */
+-	if((actinfo->action == respip_deny ||
++	if(actinfo->action == respip_always_deny ||
++		((actinfo->action == respip_deny ||
+ 		actinfo->action == respip_inform_deny) &&
+-		*encode_repp == rep)
++		*encode_repp == rep))
+ 		*encode_repp = NULL;
+ 
+ 	return 1;
+@@ -2458,12 +2459,15 @@ mesh_serve_expired_callback(void* arg)
+ 			qstate->client_info, &actinfo, msg->rep, &alias_rrset, &encode_rep,
+ 			qstate->env->auth_zones)) {
+ 			return;
+-		} else if(partial_rep &&
+-			!respip_merge_cname(partial_rep, &qstate->qinfo, msg->rep,
++		} else if(partial_rep) {
++			if(!respip_merge_cname(partial_rep, &qstate->qinfo, msg->rep,
+ 			qstate->client_info, must_validate, &encode_rep, qstate->region,
+ 			qstate->env->auth_zones, qstate->env->views,
+ 			qstate->env->respip_set)) {
+-			return;
++				return;
++			}
++			/* merge succeeded; final reply, no further alias pass */
++			partial_rep = NULL;
+ 		}
+ 		if(!encode_rep || alias_rrset) {
+ 			if(!encode_rep) {
+@@ -2474,6 +2478,7 @@ mesh_serve_expired_callback(void* arg)
+ 				partial_rep = encode_rep;
+ 			}
+ 		}
++		msg->rep = encode_rep;
+ 		/* We've found a partial reply ending with an
+ 		* alias.  Replace the lookup qinfo for the
+ 		* alias target and lookup the cache again to
+diff --git a/util/data/packed_rrset.c b/util/data/packed_rrset.c
+index d18486cc5..720c56ac3 100644
+--- a/util/data/packed_rrset.c
++++ b/util/data/packed_rrset.c
+@@ -198,6 +198,7 @@ get_cname_target(struct ub_packed_rrset_key* rrset, uint8_t** dname,
+ {
+ 	struct packed_rrset_data* d;
+ 	size_t len;
++	if(!rrset) return;
+ 	if(ntohs(rrset->rk.type) != LDNS_RR_TYPE_CNAME && 
+ 		ntohs(rrset->rk.type) != LDNS_RR_TYPE_DNAME)
+ 		return;

meta-networking/recipes-support/unbound/unbound_1.24.2.bb

@@ -37,6 +37,7 @@ SRC_URI = "git://github.com/NLnetLabs/unbound.git;protocol=https;branch=master;t
            file://CVE-2026-52863.patch \
            file://CVE-2026-54478.patch \
            file://CVE-2026-55708.patch \
+           file://CVE-2026-55717.patch \
            "
 
 SRCREV = "f6269baa605d31859f28770e01a24e3677e5f82c"