jq: Fix CVE-2026-43896

The upstream fix [3] is for a newer jq codebase. Debian has already
backported this fix in jq 1.8.1-7. Use the Debian patch [1], which fixes
this CVE as tracked in Debian bug #1136445 [2].

[1] https://sources.debian.org/src/jq/1.8.1-7/debian/patches/CVE-2026-43896.patch
[2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1136445
[3] https://github.com/jqlang/jq/commit/532ccea6080ed6758f39fe9f6208a44b665023d2

Reference:
https://github.com/jqlang/jq/security/advisories/GHSA-mg96-6h3q-g846

Signed-off-by: Shubham Pushpkar <spushpka@cisco.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>

meta-oe/recipes-devtools/jq/jq/CVE-2026-43896.patch

@@ -0,0 +1,97 @@
+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.
+
+CVE: CVE-2026-43896
+Upstream-Status: Backport [https://github.com/jqlang/jq/commit/532ccea6080ed6758f39fe9f6208a44b665023d2]
+
+Backport Changes:
+- Adapted the tests/jq.test hunk context to apply after the existing
+  jq 1.7.1 CVE regression tests in the scarthgap patch stack.
+- The upstream regression test used `reduce ... as $x` without wrapping
+  the `reduce` expression in parentheses. jq 1.7.1 parses that form as a
+  syntax error before the test can run.
+- Wrapped the `reduce range(...) ...` expression in an extra set of
+  parentheses so jq 1.7.1 first builds the nested object, then binds that
+  result to `$x` for the object merge depth-limit check.
+
+(cherry picked from commit 532ccea6080ed6758f39fe9f6208a44b665023d2)
+Signed-off-by: Shubham Pushpkar <spushpka@cisco.com>
+---
+ 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 34573b8..b112757 100644
+--- a/src/jv.c
++++ b/src/jv.c
+@@ -1884,16 +1884,33 @@ 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);
+@@ -1904,6 +1921,10 @@ 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 86bfc56..a258c11 100644
+--- a/tests/jq.test
++++ b/tests/jq.test
+@@ -2633,3 +2633,12 @@ 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"
+--
+2.44.4

meta-oe/recipes-devtools/jq/jq_1.7.1.bb

@@ -24,6 +24,7 @@ SRC_URI = "${GITHUB_BASE_URI}/download/${BPN}-${PV}/${BPN}-${PV}.tar.gz \
     file://CVE-2026-41256.patch \
     file://CVE-2026-41257.patch \
     file://CVE-2026-43894.patch \
+    file://CVE-2026-43896.patch \
     "
 SRC_URI[sha256sum] = "478c9ca129fd2e3443fe27314b455e211e0d8c60bc8ff7df703873deeee580c2"