[AutoPR- Security] Patch nginx for CVE-2026-48142 [MEDIUM] (microsoft#17833)

Co-authored-by: SumitJenaHCL <v-sumitjena@microsoft.com>

Author: azurelinux-security

SPECS/nginx/CVE-2026-48142.patch

@@ -0,0 +1,40 @@
+From 0482091e8a6b53ba14b4b8cae855063762aadbbc Mon Sep 17 00:00:00 2001
+From: Sergey Kandaurov <pluknet@nginx.com>
+Date: Mon, 1 Jun 2026 21:46:48 +0400
+Subject: [PATCH] Charset: fixed another rare buffer overread in
+ recode_from_utf8()
+
+With prerequisites similar to 696a7f1b9, it was possible to gain 1-byte
+overread on invalid UTF-8 sequences.  The reason is ngx_utf8_decode()
+stops advancing the pointer position on the first encountered invalid
+byte.  The fix is to adjust the advanced pointer up to the whole saved
+sequence in this case.  Note that this may result in different output
+compared to complete invalid UTF-8 sequences, which we can disregard
+at this point.
+
+Reported by Han Yan of Xiaomi and p4p3r of CYBERONE.
+
+Signed-off-by: Azure Linux Security Servicing Account <azurelinux-security@microsoft.com>
+Upstream-reference: https://github.com/nginx/nginx/commit/60c4243eb8775d51662a01def8a7dad5d9fb34a7.patch
+---
+ src/http/modules/ngx_http_charset_filter_module.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/http/modules/ngx_http_charset_filter_module.c b/src/http/modules/ngx_http_charset_filter_module.c
+index edb2db5..e0115e1 100644
+--- a/src/http/modules/ngx_http_charset_filter_module.c
++++ b/src/http/modules/ngx_http_charset_filter_module.c
+@@ -855,6 +855,10 @@ ngx_http_charset_recode_from_utf8(ngx_pool_t *pool, ngx_buf_t *buf,
+         ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pool->log, 0,
+                        "http charset invalid utf 1");
+ 
++        if (saved < &ctx->saved[ctx->saved_len]) {
++            saved = &ctx->saved[ctx->saved_len];
++        }
++
+     } else {
+         dst = ngx_sprintf(dst, "&#%uD;", n);
+     }
+-- 
+2.45.4
+

SPECS/nginx/nginx.spec

@@ -6,7 +6,7 @@ Name:           nginx
 # Currently on "stable" version of nginx from https://nginx.org/en/download.html.
 # Note: Stable versions are even (1.20), mainline versions are odd (1.21)
 Version:        1.28.3
-Release:        5%{?dist}
+Release:        6%{?dist}
 License:        BSD-2-Clause
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -32,6 +32,7 @@ Patch9:         CVE-2026-42945.patch
 Patch10:        CVE-2026-42946.patch
 Patch11:        CVE-2026-9256.patch
 Patch12:        CVE-2026-49975.patch
+Patch13:        CVE-2026-48142.patch
 
 # njs patches start at 1001 to keep them separate from nginx patches
 Patch1001:      CVE-2026-8711.patch
@@ -184,6 +185,9 @@ rm -rf nginx-tests
 %dir %{_sysconfdir}/%{name}
 
 %changelog
+* Sat Jun 27 2026 Azure Linux Security Servicing Account <azurelinux-security@microsoft.com> - 1.28.3-6
+- Patch for CVE-2026-48142
+
 * Fri Jun 05 2026 Akhila Guruju <v-guakhila@microsoft.com> - 1.28.3-5
 - Patch for CVE-2026-49975