From: Deepak Rathore <[email protected]> This patch applies the upstream fix shown in [1] as referenced by [2]. The fix is adapted to the existing Scarthgap Expat 2.6.4 source.
[1] https://github.com/libexpat/libexpat/commit/16e2efd867ea8567ffa012210b52ef5918e20817 [2] https://nvd.nist.gov/vuln/detail/CVE-2026-56408 Signed-off-by: Deepak Rathore <[email protected]> --- .../expat/expat/CVE-2026-56408.patch | 33 +++++++++++++++++++ meta/recipes-core/expat/expat_2.6.4.bb | 1 + 2 files changed, 34 insertions(+) create mode 100644 meta/recipes-core/expat/expat/CVE-2026-56408.patch diff --git a/meta/recipes-core/expat/expat/CVE-2026-56408.patch b/meta/recipes-core/expat/expat/CVE-2026-56408.patch new file mode 100644 index 0000000000..7fbe617b47 --- /dev/null +++ b/meta/recipes-core/expat/expat/CVE-2026-56408.patch @@ -0,0 +1,33 @@ +From c1ad5610cf060c6374d8f8d3b39163edd7053321 Mon Sep 17 00:00:00 2001 +From: Sebastian Pipping <[email protected]> +Date: Thu, 23 Apr 2026 10:31:45 +0200 +Subject: [PATCH 03/17] lib: Waterproof `copyString` from integer overflow + +CVE: CVE-2026-56408 +Upstream-Status: Backport [https://github.com/libexpat/libexpat/commit/16e2efd867ea8567ffa012210b52ef5918e20817] + +Backport Changes: +- Keep the Scarthgap 2.6.4 copyString loop and add only the + upstream allocation overflow guard. + +(cherry picked from commit 16e2efd867ea8567ffa012210b52ef5918e20817) +Signed-off-by: Deepak Rathore <[email protected]> +--- + expat/lib/xmlparse.c | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c +index df92a3ca..12bbe23e 100644 +--- a/expat/lib/xmlparse.c ++++ b/expat/lib/xmlparse.c +@@ -8489,6 +8489,10 @@ copyString(const XML_Char *s, XML_Parser parser) { + /* Include the terminator */ + charsRequired++; + ++ /* Detect and prevent integer overflow */ ++ if (charsRequired > SIZE_MAX / sizeof(XML_Char)) ++ return NULL; ++ + /* Now allocate space for the copy */ + result = MALLOC(parser, charsRequired * sizeof(XML_Char)); + if (result == NULL) diff --git a/meta/recipes-core/expat/expat_2.6.4.bb b/meta/recipes-core/expat/expat_2.6.4.bb index dba4b2c81d..acd943b4e6 100644 --- a/meta/recipes-core/expat/expat_2.6.4.bb +++ b/meta/recipes-core/expat/expat_2.6.4.bb @@ -53,6 +53,7 @@ SRC_URI = "${GITHUB_BASE_URI}/download/R_${VERSION_TAG}/expat-${PV}.tar.bz2 \ file://CVE-2026-32778-02.patch \ file://CVE-2026-56403_p1.patch;striplevel=2 \ file://CVE-2026-56403_p2.patch;striplevel=2 \ + file://CVE-2026-56408.patch;striplevel=2 \ " GITHUB_BASE_URI = "https://github.com/libexpat/libexpat/releases/";
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