@@ -23,6 +23,7 @@ SRC_URI = "${GITHUB_BASE_URI}/download/v${PV}/cups-${PV}-source.tar.gz \
file://CVE-2026-27447.patch \
file://CVE-2026-27447-regression_p1.patch \
file://CVE-2026-27447-regression_p2.patch \
+ file://CVE-2026-34978.patch \
"
GITHUB_BASE_URI = "https://github.com/OpenPrinting/cups/releases"
new file mode 100644
@@ -0,0 +1,102 @@
+From ab6ab965de6890aed4df39c97f7cd708fd5cb00c Mon Sep 17 00:00:00 2001
+From: Michael R Sweet <msweet@msweet.org>
+Date: Tue, 31 Mar 2026 14:18:26 -0400
+Subject: [PATCH] Fix RSS notifier.
+
+CVE: CVE-2026-34978
+Upstream-Status: Backport [https://github.com/OpenPrinting/cups/commit/730347c5bbd5e1271149c6739aa858c0c83a7568]
+
+Backport Changes:
+- Rebase CHANGES.md placement and scheduler/ipp.c subscription context to the
+ CUPS 2.4.11 source carried by this recipe.
+
+(cherry picked from commit 730347c5bbd5e1271149c6739aa858c0c83a7568)
+Signed-off-by: Anil Dongare <adongare@cisco.com>
+---
+ CHANGES.md | 2 ++
+ notifier/rss.c | 20 ++++++++++++++------
+ scheduler/ipp.c | 12 ++++++++++++
+ 3 files changed, 28 insertions(+), 6 deletions(-)
+
+diff --git a/CHANGES.md b/CHANGES.md
+index 7a5e8813f..429ee874f 100644
+--- a/CHANGES.md
++++ b/CHANGES.md
+@@ -21,9 +21,11 @@ Changes in CUPS v2.4.11 (2024-09-30)
+ Changes in CUPS v2.4.10 (2024-06-18)
+ ------------------------------------
+
+ - CVE-2026-27447: The scheduler treated local user and group names as case-
+ insensitive.
+- Fixed cupsd crash if user does not exist (Issue #1555)
++- CVE-2026-34978: The RSS notifier could write outside the scheduler's RSS
++ directory.
+ - Fixed error handling when reading a mixed `1setOf` attribute.
+ - Fixed scheduler start if there is only domain socket to listen on (Issue #985)
+
+diff --git a/notifier/rss.c b/notifier/rss.c
+index f17e1494c..250ad877e 100644
+--- a/notifier/rss.c
++++ b/notifier/rss.c
+@@ -1,11 +1,12 @@
+ /*
+ * RSS notifier for CUPS.
+ *
+- * Copyright © 2020-2024 by OpenPrinting.
+- * Copyright 2007-2015 by Apple Inc.
+- * Copyright 2007 by Easy Software Products.
++ * Copyright © 2020-2026 by OpenPrinting.
++ * Copyright © 2007-2015 by Apple Inc.
++ * Copyright © 2007 by Easy Software Products.
+ *
+- * Licensed under Apache License v2.0. See the file "LICENSE" for more information.
++ * Licensed under Apache License v2.0. See the file "LICENSE" for more
++ * information.
+ */
+
+ /*
+@@ -80,6 +81,7 @@ main(int argc, /* I - Number of command-line arguments */
+ http_status_t status; /* HTTP GET/PUT status code */
+ char filename[1024], /* Local filename */
+ newname[1024]; /* filename.N */
++ struct stat fileinfo; /* Local file information */
+ cups_lang_t *language; /* Language information */
+ ipp_attribute_t *printer_up_time, /* Timestamp on event */
+ *notify_sequence_number,/* Sequence number */
+@@ -111,9 +113,9 @@ main(int argc, /* I - Number of command-line arguments */
+
+ if (httpSeparateURI(HTTP_URI_CODING_ALL, argv[1], scheme, sizeof(scheme),
+ username, sizeof(username), host, sizeof(host), &port,
+- resource, sizeof(resource)) < HTTP_URI_OK)
++ resource, sizeof(resource)) < HTTP_URI_OK || strstr(resource, "../") != NULL)
+ {
+- fprintf(stderr, "ERROR: Bad RSS URI \"%s\"!\n", argv[1]);
++ fprintf(stderr, "ERROR: Bad RSS URI \"%s\".\n", argv[1]);
+ return (1);
+ }
+
+@@ -209,6 +211,12 @@ main(int argc, /* I - Number of command-line arguments */
+ snprintf(filename, sizeof(filename), "%s/rss%s", cachedir, resource);
+ snprintf(newname, sizeof(newname), "%s.N", filename);
+
++ if (!lstat(filename, &fileinfo) && !S_ISREG(fileinfo.st_mode))
++ {
++ fprintf(stderr, "ERROR: Local RSS path \"%s\" is not a file.\n", filename);
++ return (1);
++ }
++
+ httpAssembleURIf(HTTP_URI_CODING_ALL, baseurl, sizeof(baseurl), "http",
+ NULL, server_name, atoi(server_port), "/rss%s", resource);
+ }
+diff --git a/scheduler/ipp.c b/scheduler/ipp.c
+index 2d80a960e..2dc7376c1 100644
+--- a/scheduler/ipp.c
++++ b/scheduler/ipp.c
+@@ -1985,6 +1985,12 @@ add_job_subscriptions(
+ "notify-status-code", IPP_ATTRIBUTES);
+ return;
+ }
++ else if (!strcmp(scheme, "rss") && strstr(resource, "../") != NULL)
++ {
++ send_ipp_status(con, IPP_STATUS_ERROR_NOT_POSSIBLE, _("Bad notify-recipient-uri URI \"%s\"."), recipient);
++ ippAddInteger(con->response, IPP_TAG_SUBSCRIPTION, IPP_TAG_ENUM, "notify-status-code", IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES);