[PATCH 4/8] jq: patch CVE-2026-43896

[Anton Skorup <antonsk@axis.com>]

From: Anton Skorup <anton@skorup.se>

CVE details: https://www.cve.org/CVERecord?id=CVE-2026-43896

Signed-off-by: Anton Skorup <anton.skorup@axis.com>
---
 .../jq/jq/CVE-2026-43896.patch                | 82 +++++++++++++++++++
 meta-oe/recipes-devtools/jq/jq_1.8.1.bb       |  1 +
 2 files changed, 83 insertions(+)
 create mode 100644 meta-oe/recipes-devtools/jq/jq/CVE-2026-43896.patch

diff --git a/meta-oe/recipes-devtools/jq/jq/CVE-2026-43896.patch b/meta-oe/recipes-devtools/jq/jq/CVE-2026-43896.patch
new file mode 100644
index 0000000000..318c86a121
--- /dev/null
+++ b/meta-oe/recipes-devtools/jq/jq/CVE-2026-43896.patch
@@ -0,0 +1,82 @@
+From 532ccea6080ed6758f39fe9f6208a44b665023d2 Mon Sep 17 00:00:00 2001
+From: itchyny <itchyny@cybozu.co.jp>
+Date: Tue, 5 May 2026 22:44:02 +0900
+Subject: [PATCH] Limit recursive object merge depth to prevent stack overflow
+
+This fixes CVE-2026-43896.
+
+Signed-off-by: Anton Skorup <anton.skorup@axis.com>
+Upstream-Status: Backport [https://github.com/jqlang/jq/commit/532ccea6080ed6758f39fe9f6208a44b665023d2]
+---
+ src/jv.c      | 25 +++++++++++++++++++++++--
+ tests/jq.test |  9 +++++++++
+ 2 files changed, 32 insertions(+), 2 deletions(-)
+
+diff --git a/src/jv.c b/src/jv.c
+index feb68d1a1c..84fafef666 100644
+--- a/src/jv.c
++++ b/src/jv.c
+@@ -1899,16 +1899,33 @@ jv jv_object_merge(jv a, jv b) {
+   return a;
+ }
+ 
+-jv jv_object_merge_recursive(jv a, jv b) {
++#ifndef MAX_OBJECT_MERGE_DEPTH
++#define MAX_OBJECT_MERGE_DEPTH (10000)
++#endif
++
++static jv jvp_object_merge_recursive(jv a, jv b, int depth) {
+   assert(JVP_HAS_KIND(a, JV_KIND_OBJECT));
+   assert(JVP_HAS_KIND(b, JV_KIND_OBJECT));
+ 
++  if (depth > MAX_OBJECT_MERGE_DEPTH) {
++    jv_free(a);
++    jv_free(b);
++    return jv_invalid_with_msg(jv_string("Object merge too deep"));
++  }
++
+   jv_object_foreach(b, k, v) {
+     jv elem = jv_object_get(jv_copy(a), jv_copy(k));
+     if (jv_is_valid(elem) &&
+         JVP_HAS_KIND(elem, JV_KIND_OBJECT) &&
+         JVP_HAS_KIND(v, JV_KIND_OBJECT)) {
+-      a = jv_object_set(a, k, jv_object_merge_recursive(elem, v));
++      jv merged = jvp_object_merge_recursive(elem, v, depth + 1);
++      if (!jv_is_valid(merged)) {
++        jv_free(k);
++        jv_free(a);
++        jv_free(b);
++        return merged;
++      }
++      a = jv_object_set(a, k, merged);
+     } else {
+       jv_free(elem);
+       a = jv_object_set(a, k, v);
+@@ -1919,6 +1936,10 @@ jv jv_object_merge_recursive(jv a, jv b) {
+   return a;
+ }
+ 
++jv jv_object_merge_recursive(jv a, jv b) {
++  return jvp_object_merge_recursive(a, b, 0);
++}
++
+ /*
+  * Object iteration (internal helpers)
+  */
+diff --git a/tests/jq.test b/tests/jq.test
+index 8094a5b6eb..9a80341f52 100644
+--- a/tests/jq.test
++++ b/tests/jq.test
+@@ -2602,3 +2602,12 @@ true
+ try (reduce range(10001) as $_ ([]; [.]) as $x | $x | contains($x)) catch .
+ null
+ "Containment check too deep"
++
++# regression test for CVE-2026-43896
++reduce range(10000) as $_ ({}; {a: .}) as $x | $x * $x | length
++null
++1
++
++try (reduce range(10001) as $_ ({}; {a: .}) as $x | $x * $x) catch .
++null
++"Object merge too deep"
diff --git a/meta-oe/recipes-devtools/jq/jq_1.8.1.bb b/meta-oe/recipes-devtools/jq/jq_1.8.1.bb
index 2e6c3a3eea..082a827041 100644
--- a/meta-oe/recipes-devtools/jq/jq_1.8.1.bb
+++ b/meta-oe/recipes-devtools/jq/jq_1.8.1.bb
@@ -18,6 +18,7 @@ SRC_URI = "git://github.com/jqlang/jq.git;protocol=https;branch=master;tag=jq-${
            file://CVE-2026-33948.patch \
            file://CVE-2026-39979.patch \
            file://CVE-2026-41256.patch \
+           file://CVE-2026-43896.patch \
            file://CVE-2026-44777.patch \
            file://CVE-2026-49389.patch \
            "
-- 
2.43.0