new file mode 100644
@@ -0,0 +1,90 @@
+From 436584a4302b1c6da55080c0a0408a98e551ea7e Mon Sep 17 00:00:00 2001
+From: "Arnold D. Robbins" <arnold@skeeve.com>
+Date: Mon, 6 Apr 2026 10:56:38 +0300
+Subject: [PATCH] Add overflow checking in do_sub for 32 bit systems.
+
+CVE: CVE-2026-40469
+Upstream-Status: Backport [https://cgit.git.savannah.gnu.org/cgit/gawk.git/commit/?id=aa7272a6e1184cdd21ab8f89200219abd8053eda]
+
+(cherry picked from commit aa7272a6e1184cdd21ab8f89200219abd8053eda)
+Signed-off-by: Darsh Kelaiya <dkelaiya@cisco.com>
+---
+ ChangeLog | 9 +++++++++
+ builtin.c | 25 ++++++++++++++++++++-----
+ 2 files changed, 29 insertions(+), 5 deletions(-)
+
+diff --git a/ChangeLog b/ChangeLog
+index 8cdf90f6..c1b2e7f4 100644
+--- a/ChangeLog
++++ b/ChangeLog
+@@ -1,3 +1,12 @@
++2026-04-06 Arnold D. Robbins <arnold@skeeve.com>
++
++ * builtin.c (do_sub): Check for overflow in calculation of size
++ of result buffer by doing the math in 64 bits. This provides
++ a fatal message on 32 bit systems if overflow happens instead
++ of letting dynamic memory get corrupted and likely causing
++ a core dump. Thanks to Michał Majchrowicz <mmajchrowicz@afine.com>
++ for the report and fix.
++
+ 2026-04-04 Arnold D. Robbins <arnold@skeeve.com>
+
+ * builtin.c (do_sub): Make `sofar' be size_t to avoid
+diff --git a/builtin.c b/builtin.c
+index d0e083da..3906d507 100644
+--- a/builtin.c
++++ b/builtin.c
+@@ -1820,11 +1820,13 @@ do_sub(int nargs, unsigned int flags)
+ bool lastmatchnonzero;
+ char *mb_indices = NULL;
+ int searchflags = RE_NEED_START;
++ const char *fname = NULL; // for fatal message, below
+
+ if ((flags & GENSUB) != 0) {
+ double d;
+ NODE *glob_flag;
+
++ fname = "gensub";
+ check_exact_args(nargs, "gensub", 4);
+
+ tmp = PEEK(3);
+@@ -1856,11 +1858,9 @@ do_sub(int nargs, unsigned int flags)
+ DEREF(glob_flag);
+ searchflags |= RE_NEED_SUB;
+ } else {
+- if ((flags & GSUB) != 0) {
+- check_exact_args(nargs, "gsub", 3);
+- } else {
+- check_exact_args(nargs, "sub", 3);
+- }
++ fname = ((flags & GSUB) != 0) ? "gsub" : "sub";
++
++ check_exact_args(nargs, fname, 3);
+
+ /* take care of regexp early, in case re_update is fatal */
+
+@@ -1976,6 +1976,21 @@ do_sub(int nargs, unsigned int flags)
+ * vary since ampersand is actual text of regexp match.
+ */
+
++ // 4/2026: This overflow check simply provides a fatal
++ // message instead of letting realloc() die later after
++ // a buffer overrun. It simply makes the user experience better,
++ // but does not prevent gawk from dying miserably. I suppose
++ // it's worth the trouble, but just barely.
++
++ /* uint64_t so the product is 64-bit even on 32-bit ILP32 builds */
++ uint64_t repl_contribution =
++ (uint64_t)(unsigned int)ampersands
++ * (uint64_t)(uintptr_t)(matchend - matchstart);
++ if (repl_contribution > (uint64_t)SIZE_MAX
++ || repl_contribution > (uint64_t)SIZE_MAX - (size_t)(matchend - text)
++ - repllen - 1)
++ fatal(_("%s: replacement expansion too large"), fname);
++
+ /*
+ * add 1 to len to handle "empty" case where
+ * matchend == matchstart and we force a match on a single
+--
+2.53.0
+
@@ -30,6 +30,7 @@ SRC_URI = "${GNU_MIRROR}/gawk/gawk-${PV}.tar.xz \
file://0001-configure.ac-re-enable-disabled-printf-features.patch \
file://CVE-2026-40467.patch \
file://CVE-2026-40468.patch \
+ file://CVE-2026-40469.patch \
"
SRC_URI[sha256sum] = "3dd430f0cd3b4428c6c3f6afc021b9cd3c1f8c93f7a688dc268ca428a90b4ac1"