diff --git a/libxml2-2.12.5-extra-content-parser-error.patch b/libxml2-2.12.5-extra-content-parser-error.patch
deleted file mode 100644
index fed6fcb..0000000
--- a/libxml2-2.12.5-extra-content-parser-error.patch
+++ /dev/null
@@ -1,84 +0,0 @@
-From 9bb32f5a7db09951187a608d7ba1b71b41127da0 Mon Sep 17 00:00:00 2001
-From: Nick Wellnhofer <wellnhofer@aevum.de>
-Date: Tue, 2 Jan 2024 17:52:43 +0100
-Subject: [PATCH] parser: Fix buffer size checks
-
-Don't test size of remaining data. This causes false positives with
-memory buffers.
-
-Also impose XML_MAX_HUGE_LENGTH limit when parsing with XML_PARSE_HUGE.
----
- parser.c          | 15 ++++++++++-----
- parserInternals.c | 14 ++++++++------
- 2 files changed, 18 insertions(+), 11 deletions(-)
-
-diff --git a/parser.c b/parser.c
-index 845e0fd3..77106c1d 100644
---- a/parser.c
-+++ b/parser.c
-@@ -12198,6 +12198,8 @@ encoding_error:
- int
- xmlParseChunk(xmlParserCtxtPtr ctxt, const char *chunk, int size,
-               int terminate) {
-+    size_t curBase;
-+    size_t maxLength;
-     int end_in_lf = 0;
- 
-     if (ctxt == NULL)
-@@ -12236,13 +12238,16 @@ xmlParseChunk(xmlParserCtxtPtr ctxt, const char *chunk, int size,
-     if (ctxt->instate == XML_PARSER_EOF)
-         return(ctxt->errNo);
- 
--    if ((ctxt->input != NULL) &&
--         (((ctxt->input->end - ctxt->input->cur) > XML_MAX_LOOKUP_LIMIT) ||
--         ((ctxt->input->cur - ctxt->input->base) > XML_MAX_LOOKUP_LIMIT)) &&
--        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
--        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR, "Huge input lookup");
-+    curBase = ctxt->input->cur - ctxt->input->base;
-+    maxLength = (ctxt->options & XML_PARSE_HUGE) ?
-+                XML_MAX_HUGE_LENGTH :
-+                XML_MAX_LOOKUP_LIMIT;
-+    if (curBase > maxLength) {
-+        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
-+                    "Buffer size limit exceeded, try XML_PARSE_HUGE\n");
-         xmlHaltParser(ctxt);
-     }
-+
-     if ((ctxt->errNo != XML_ERR_OK) && (ctxt->disableSAX == 1))
-         return(ctxt->errNo);
- 
-diff --git a/parserInternals.c b/parserInternals.c
-index 166397bd..9484ebdd 100644
---- a/parserInternals.c
-+++ b/parserInternals.c
-@@ -511,8 +511,11 @@ int
- xmlParserGrow(xmlParserCtxtPtr ctxt) {
-     xmlParserInputPtr in = ctxt->input;
-     xmlParserInputBufferPtr buf = in->buf;
--    ptrdiff_t curEnd = in->end - in->cur;
--    ptrdiff_t curBase = in->cur - in->base;
-+    size_t curEnd = in->end - in->cur;
-+    size_t curBase = in->cur - in->base;
-+    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
-+                       XML_MAX_HUGE_LENGTH :
-+                       XML_MAX_LOOKUP_LIMIT;
-     int ret;
- 
-     if (buf == NULL)
-@@ -526,10 +529,9 @@ xmlParserGrow(xmlParserCtxtPtr ctxt) {
-     if (buf->error != 0)
-         return(-1);
- 
--    if (((curEnd > XML_MAX_LOOKUP_LIMIT) ||
--         (curBase > XML_MAX_LOOKUP_LIMIT)) &&
--        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
--        xmlErrMemory(ctxt, "Huge input lookup");
-+    if (curBase > maxLength) {
-+        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
-+                    "Buffer size limit exceeded, try XML_PARSE_HUGE\n");
-         xmlHaltParser(ctxt);
- 	return(-1);
-     }
--- 
-2.54.0
-
diff --git a/libxml2.spec b/libxml2.spec
index 26260d5..9a31df2 100644
--- a/libxml2.spec
+++ b/libxml2.spec
@@ -1,6 +1,6 @@
 Name:           libxml2
 Version:        2.12.5
-Release:        12%{?dist}
+Release:        13%{?dist}
 Summary:        Library providing XML and HTML support
 
 # list.c, dict.c and few others use ISC-Veillard
@@ -41,9 +41,6 @@ Patch10:        libxml2-2.12.5-CVE-2025-32414.patch
 Patch11:        libxml2-2.12.5-xmllint-error-code.patch
 # https://redhat.atlassian.net/browse/RHEL-36782
 Patch12:        libxml2-2.12.5-CVE-2024-34459.patch
-# https://gitlab.gnome.org/GNOME/libxml2/-/commit/85f99023ae2eaec94ae0799fd37281a7f234d99a.patch
-# https://redhat.atlassian.net/browse/RHEL-126803
-Patch13:        libxml2-2.12.5-extra-content-parser-error.patch
 
 BuildRequires:  cmake-rpm-macros
 BuildRequires:  gcc
@@ -184,6 +181,9 @@ popd
 %{python3_sitelib}/__pycache__/drv_libxml2.*
 
 %changelog
+* Wed Jun 03 2026 David King <dking@redhat.com> - 2.12.5-13
+- Revert parser error fix (RHEL-126803)
+
 * Sat May 30 2026 David King <dking@redhat.com> - 2.12.5-12
 - Fix parser error (RHEL-126803)