diff --git a/SOURCES/expat-CVE-2022-25235.patch b/SOURCES/expat-CVE-2022-25235.patch
new file mode 100644
index 0000000..ac495b1
--- /dev/null
+++ b/SOURCES/expat-CVE-2022-25235.patch
@@ -0,0 +1,49 @@
+diff -up thunderbird-91.7.0/parser/expat/lib/xmltok.c.expat-CVE-2022-25235 thunderbird-91.7.0/parser/expat/lib/xmltok.c
+--- thunderbird-91.7.0/parser/expat/lib/xmltok.c.expat-CVE-2022-25235 2022-03-02 17:57:38.364361168 +0100
++++ thunderbird-91.7.0/parser/expat/lib/xmltok.c 2022-03-02 17:58:22.235512399 +0100
+@@ -65,13 +65,6 @@
+ + ((((byte)[2]) >> 5) & 1)] \
+ & (1u << (((byte)[2]) & 0x1F)))
+
+-#define UTF8_GET_NAMING(pages, p, n) \
+- ((n) == 2 \
+- ? UTF8_GET_NAMING2(pages, (const unsigned char *)(p)) \
+- : ((n) == 3 \
+- ? UTF8_GET_NAMING3(pages, (const unsigned char *)(p)) \
+- : 0))
+-
+ /* Detection of invalid UTF-8 sequences is based on Table 3.1B
+ of Unicode 3.2: http://www.unicode.org/unicode/reports/tr28/
+ with the additional restriction of not allowing the Unicode
+diff -up thunderbird-91.7.0/parser/expat/lib/xmltok_impl.c.expat-CVE-2022-25235 thunderbird-91.7.0/parser/expat/lib/xmltok_impl.c
+--- thunderbird-91.7.0/parser/expat/lib/xmltok_impl.c.expat-CVE-2022-25235 2022-03-02 17:57:38.365361172 +0100
++++ thunderbird-91.7.0/parser/expat/lib/xmltok_impl.c 2022-03-02 18:04:51.240853247 +0100
+@@ -34,7 +34,7 @@
+ case BT_LEAD ## n: \
+ if (end - ptr < n) \
+ return XML_TOK_PARTIAL_CHAR; \
+- if (!IS_NAME_CHAR(enc, ptr, n)) { \
++ if (IS_INVALID_CHAR(enc, ptr, n) || ! IS_NAME_CHAR(enc, ptr, n)) { \
+ *nextTokPtr = ptr; \
+ return XML_TOK_INVALID; \
+ } \
+@@ -62,7 +62,7 @@
+ case BT_LEAD ## n: \
+ if (end - ptr < n) \
+ return XML_TOK_PARTIAL_CHAR; \
+- if (!IS_NMSTRT_CHAR(enc, ptr, n)) { \
++ if (IS_INVALID_CHAR(enc, ptr, n) || ! IS_NMSTRT_CHAR(enc, ptr, n)) { \
+ *nextTokPtr = ptr; \
+ return XML_TOK_INVALID; \
+ } \
+@@ -1090,6 +1090,10 @@ PREFIX(prologTok)(const ENCODING *enc, c
+ case BT_LEAD ## n: \
+ if (end - ptr < n) \
+ return XML_TOK_PARTIAL_CHAR; \
++ if (IS_INVALID_CHAR(enc, ptr, n)) { \
++ *nextTokPtr = ptr; \
++ return XML_TOK_INVALID; \
++ } \
+ if (IS_NMSTRT_CHAR(enc, ptr, n)) { \
+ ptr += n; \
+ tok = XML_TOK_NAME; \
diff --git a/SOURCES/expat-CVE-2022-25236.patch b/SOURCES/expat-CVE-2022-25236.patch
new file mode 100644
index 0000000..84cafd2
--- /dev/null
+++ b/SOURCES/expat-CVE-2022-25236.patch
@@ -0,0 +1,40 @@
+diff -up thunderbird-91.7.0/parser/expat/lib/xmlparse.c.expat-CVE-2022-25236 thunderbird-91.7.0/parser/expat/lib/xmlparse.c
+--- thunderbird-91.7.0/parser/expat/lib/xmlparse.c.expat-CVE-2022-25236 2022-03-02 18:08:40.085642028 +0100
++++ thunderbird-91.7.0/parser/expat/lib/xmlparse.c 2022-03-02 18:13:31.838667958 +0100
+@@ -700,8 +700,7 @@ XML_ParserCreate(const XML_Char *encodin
+ XML_Parser XMLCALL
+ XML_ParserCreateNS(const XML_Char *encodingName, XML_Char nsSep)
+ {
+- XML_Char tmp[2];
+- *tmp = nsSep;
++ XML_Char tmp[2] = {nsSep, 0};
+ return XML_ParserCreate_MM(encodingName, NULL, tmp);
+ }
+ #endif
+@@ -1276,8 +1275,7 @@ XML_ExternalEntityParserCreate(XML_Parse
+ would be otherwise.
+ */
+ if (ns) {
+- XML_Char tmp[2];
+- *tmp = namespaceSeparator;
++ XML_Char tmp[2] = {parser->m_namespaceSeparator, 0};
+ parser = parserCreate(encodingName, &parser->m_mem, tmp, newDtd);
+ }
+ else {
+@@ -3667,6 +3665,16 @@ addBinding(XML_Parser parser, PREFIX *pr
+ if (!mustBeXML && isXMLNS
+ && (len > xmlnsLen || uri[len] != xmlnsNamespace[len]))
+ isXMLNS = XML_FALSE;
++ // NOTE: While Expat does not validate namespace URIs against RFC 3986,
++ // we have to at least make sure that the XML processor on top of
++ // Expat (that is splitting tag names by namespace separator into
++ // 2- or 3-tuples (uri-local or uri-local-prefix)) cannot be confused
++ // by an attacker putting additional namespace separator characters
++ // into namespace declarations. That would be ambiguous and not to
++ // be expected.
++ if (parser->m_ns && (uri[len] == parser->m_namespaceSeparator)) {
++ return XML_ERROR_SYNTAX;
++ }
+ }
+ isXML = isXML && len == xmlLen;
+ isXMLNS = isXMLNS && len == xmlnsLen;
diff --git a/SOURCES/expat-CVE-2022-25315.patch b/SOURCES/expat-CVE-2022-25315.patch
new file mode 100644
index 0000000..4d4efb7
--- /dev/null
+++ b/SOURCES/expat-CVE-2022-25315.patch
@@ -0,0 +1,24 @@
+diff -up thunderbird-91.7.0/parser/expat/lib/xmlparse.c.expat-CVE-2022-25315 thunderbird-91.7.0/parser/expat/lib/xmlparse.c
+--- thunderbird-91.7.0/parser/expat/lib/xmlparse.c.expat-CVE-2022-25315 2022-03-02 18:17:50.966583254 +0100
++++ thunderbird-91.7.0/parser/expat/lib/xmlparse.c 2022-03-02 18:19:27.636924735 +0100
+@@ -2479,6 +2479,7 @@ storeRawNames(XML_Parser parser)
+ while (tag) {
+ int bufSize;
+ int nameLen = sizeof(XML_Char) * (tag->name.strLen + 1);
++ size_t rawNameLen;
+ char *rawNameBuf = tag->buf + nameLen;
+ /* Stop if already stored. Since tagStack is a stack, we can stop
+ at the first entry that has already been copied; everything
+@@ -2490,7 +2491,11 @@ storeRawNames(XML_Parser parser)
+ /* For re-use purposes we need to ensure that the
+ size of tag->buf is a multiple of sizeof(XML_Char).
+ */
+- bufSize = nameLen + ROUND_UP(tag->rawNameLength, sizeof(XML_Char));
++ rawNameLen = ROUND_UP(tag->rawNameLength, sizeof(XML_Char));
++ /* Detect and prevent integer overflow. */
++ if (rawNameLen > (size_t)INT_MAX - nameLen)
++ return XML_FALSE;
++ bufSize = nameLen + (int)rawNameLen;
+ if (bufSize > tag->bufEnd - tag->buf) {
+ char *temp = (char *)REALLOC(tag->buf, bufSize);
+ if (temp == NULL)