diff --git a/news/changelog-1.11.md b/news/changelog-1.11.md
index 4944dc36ba8..4ff4453d633 100644
--- a/news/changelog-1.11.md
+++ b/news/changelog-1.11.md
@@ -73,6 +73,7 @@ All changes included in 1.11:
 - ([#10756](https://github.com/quarto-dev/quarto-cli/issues/10756)): Fix the notebook preview of an embedded `.qmd` file going missing from the output directory when a project is rendered again, which broke its source notebook link.
 - ([#14974](https://github.com/quarto-dev/quarto-cli/issues/14974)): Fix math in `.llms.md` files from `llms-txt` coming out garbled with the default `mathjax` method, and with `katex` and `webtex`. Math is now written as `$...$` and `$$...$$` with the `mathjax`, `katex`, `webtex` and `mathml` methods.
 - ([#15004](https://github.com/quarto-dev/quarto-cli/issues/15004)): Fix notebook preview pages and notebook sources missing from the output directory when a website with embedded notebooks is rendered from a directory other than the project directory.
+- ([#15022](https://github.com/quarto-dev/quarto-cli/issues/15022)): Fix rendering a listing with a `feed` failing on Windows with `os error 123` when a listing item's `image` or the feed `image` is a web URL. The image URL is used as is in the feed and no local size lookup is attempted. (author: @Masad791)
 
 ## Lua API
 
diff --git a/src/project/types/website/listing/website-listing-feed.ts b/src/project/types/website/listing/website-listing-feed.ts
index 53608de9d06..d33e09d59b9 100644
--- a/src/project/types/website/listing/website-listing-feed.ts
+++ b/src/project/types/website/listing/website-listing-feed.ts
@@ -49,6 +49,7 @@ import { ProjectOutputFile } from "../../types.ts";
 import { resolveInputTarget } from "../../../project-index.ts";
 import { projectOutputDir } from "../../../project-shared.ts";
 import { imageContentType, imageSize } from "../../../../core/image.ts";
+import { isAbsoluteRef } from "../../../../core/http.ts";
 import { warnOnce } from "../../../../core/log.ts";
 import { isHtmlOutput } from "../../../../config/format.ts";
 
@@ -174,7 +175,7 @@ export async function createFeed(
       link: link,
       url: absoluteUrl(siteUrl, image),
     };
-    const size = imageSize(image);
+    const size = isAbsoluteRef(image) ? undefined : imageSize(image);
     if (size) {
       const [height, width] = feedImageSize(size.height, size.width);
       feed.image.height = height;
@@ -481,16 +482,19 @@ async function renderFeed(
     }
 
     // Image Data
-    if (item[kFieldImage] && typeof (item[kFieldImage] === "string")) {
+    if (item[kFieldImage] && typeof item[kFieldImage] === "string") {
       const image = item[kFieldImage] as string;
       feedItem.image = absoluteUrl(siteUrl, image);
-      const imagePath = join(project.dir, image);
-      feedItem.imageContentType = imageContentType(imagePath);
-      const size = imageSize(imagePath);
-      if (size) {
-        const [height, width] = feedImageSize(size.height, size.width);
-        feedItem.imageHeight = height;
-        feedItem.imageWidth = width;
+      feedItem.imageContentType = imageContentType(image);
+      // Web images have no local file to read a size from. Joining a URL onto
+      // the project dir makes an invalid path on Windows and `stat` throws.
+      if (!isAbsoluteRef(image)) {
+        const size = imageSize(join(project.dir, image));
+        if (size) {
+          const [height, width] = feedImageSize(size.height, size.width);
+          feedItem.imageHeight = height;
+          feedItem.imageWidth = width;
+        }
       }
     }
     feedItems.push(feedItem);
diff --git a/tests/docs/smoke-all/2026/10/12/issue-15022/.gitignore b/tests/docs/smoke-all/2026/10/12/issue-15022/.gitignore
new file mode 100644
index 00000000000..43c566bbdf3
--- /dev/null
+++ b/tests/docs/smoke-all/2026/10/12/issue-15022/.gitignore
@@ -0,0 +1,3 @@
+/.quarto/
+_site/
+**/*.quarto_ipynb
diff --git a/tests/docs/smoke-all/2026/10/12/issue-15022/_quarto.yml b/tests/docs/smoke-all/2026/10/12/issue-15022/_quarto.yml
new file mode 100644
index 00000000000..18e309ed964
--- /dev/null
+++ b/tests/docs/smoke-all/2026/10/12/issue-15022/_quarto.yml
@@ -0,0 +1,6 @@
+project:
+  type: website
+
+website:
+  title: "issue-15022"
+  site-url: https://example.com
diff --git a/tests/docs/smoke-all/2026/10/12/issue-15022/index.qmd b/tests/docs/smoke-all/2026/10/12/issue-15022/index.qmd
new file mode 100644
index 00000000000..e18f81baee7
--- /dev/null
+++ b/tests/docs/smoke-all/2026/10/12/issue-15022/index.qmd
@@ -0,0 +1,16 @@
+---
+title: "issue-15022"
+listing:
+  contents: posts
+  feed:
+    image: https://example.com/feed-image.png
+_quarto:
+  render-project: true
+  tests:
+    html:
+      fileExists:
+        outputPath: index.xml
+---
+
+A listing feed whose items and feed image are web URLs must render without
+trying to read them from the project directory.
diff --git a/tests/docs/smoke-all/2026/10/12/issue-15022/posts/remote-image/index.qmd b/tests/docs/smoke-all/2026/10/12/issue-15022/posts/remote-image/index.qmd
new file mode 100644
index 00000000000..126445bc4ff
--- /dev/null
+++ b/tests/docs/smoke-all/2026/10/12/issue-15022/posts/remote-image/index.qmd
@@ -0,0 +1,7 @@
+---
+title: "Post with a remote image"
+date: "2026-10-12"
+image: https://example.com/remote-thumbnail.png
+---
+
+This post uses a web-hosted image as its listing thumbnail.