diff --git a/news/changelog-1.10.md b/news/changelog-1.10.md
index fb34c2e35bc..e9f6a320ad3 100644
--- a/news/changelog-1.10.md
+++ b/news/changelog-1.10.md
@@ -22,6 +22,7 @@ All changes included in 1.10:
 
 - ([#14261](https://github.com/quarto-dev/quarto-cli/issues/14261)): Fix theorem/example block titles containing inline code producing invalid Typst markup when syntax highlighting is applied.
 - ([#14460](https://github.com/quarto-dev/quarto-cli/issues/14460)): Fix CSS `border` and `border-color` declarations losing tokens that precede an `rgb()`/`rgba()` color (e.g. `border: 0px solid rgb(255, 0, 0)` rendering as a 2.25pt border instead of being suppressed). Also fixes: `var(--brand-NAME)` references crashing the Typst CSS translator when `NAME` contained digits (e.g. `--brand-red-50`); a crash when an `rgba()` alpha is unparseable; the `dvmin` length unit being silently rejected (a stray space in the unit table); CSS keywords like `BOLD` not matching as `bold` (CSS keywords are case-insensitive); invalid hex colors like `#fffff` being silently accepted as 2-component colors.
+- ([#14511](https://github.com/quarto-dev/quarto-cli/issues/14511)): Fix brand fonts downloaded for a Typst book project not being passed to `typst compile`, causing `unknown font family` warnings and fallback to Libertinus Serif.
 
 ### `revealjs`
 
diff --git a/src/command/render/output-typst.ts b/src/command/render/output-typst.ts
index 798c7aa7fd8..762bde81eef 100644
--- a/src/command/render/output-typst.ts
+++ b/src/command/render/output-typst.ts
@@ -42,7 +42,7 @@ import { Format } from "../../config/types.ts";
 import { writeFileToStdout } from "../../core/console.ts";
 import { dirAndStem, expandPath } from "../../core/path.ts";
 import { kStdOut, replacePandocOutputArg } from "./flags.ts";
-import { OutputRecipe, RenderOptions } from "./types.ts";
+import { OutputRecipe, PandocOptions, RenderOptions } from "./types.ts";
 import { normalizeOutputPath } from "./output-shared.ts";
 import {
   typstCompile,
@@ -228,7 +228,14 @@ export function typstPdfOutputRecipe(
 
   // when pandoc is done, we need to run the pdf generator and then copy the
   // output to the user's requested destination
-  const complete = async () => {
+  //
+  // Read format state from `pandocOptions.format` rather than the captured
+  // `format` parameter: for book projects, `withBookTitleMetadata` deep-clones
+  // the recipe's format between recipe construction and `renderPandoc`, so the
+  // captured reference becomes stale and never observes mutations applied by
+  // `resolveExtras` (e.g. brand font paths). See #14511.
+  const complete = async (pandocOptions: PandocOptions) => {
+    const liveFormat = pandocOptions.format;
     // input file is pandoc's output
     const typstInput = join(inputDir, output);
 
@@ -237,12 +244,13 @@ export function typstPdfOutputRecipe(
     const pdfOutput = join(inputDir, inputStem + ".pdf");
     const typstOptions: TypstCompileOptions = {
       quiet: options.flags?.quiet,
-      fontPaths: (asArray(format.metadata?.[kFontPaths]) as string[]).map(
+      fontPaths: (asArray(liveFormat.metadata?.[kFontPaths]) as string[]).map(
         (p) => isAbsolute(p) ? p : resolve(inputDir, p),
       ),
       pdfStandard: normalizePdfStandardForTypst(
         asArray(
-          format.render?.[kPdfStandard] ?? format.metadata?.[kPdfStandard] ??
+          liveFormat.render?.[kPdfStandard] ??
+            liveFormat.metadata?.[kPdfStandard] ??
             pdfStandardEnv(),
         ),
       ),
@@ -274,7 +282,8 @@ export function typstPdfOutputRecipe(
 
     // Validate PDF against specified standards using verapdf (if available)
     const pdfStandards = asArray(
-      format.render?.[kPdfStandard] ?? format.metadata?.[kPdfStandard] ??
+      liveFormat.render?.[kPdfStandard] ??
+        liveFormat.metadata?.[kPdfStandard] ??
         pdfStandardEnv(),
     ) as string[];
     if (pdfStandards.length > 0) {
@@ -284,7 +293,7 @@ export function typstPdfOutputRecipe(
     }
 
     // keep typ if requested
-    if (!format.render[kKeepTyp]) {
+    if (!liveFormat.render[kKeepTyp]) {
       safeRemoveSync(typstInput);
     }
 
@@ -329,6 +338,14 @@ export function typstPdfOutputRecipe(
 
   // if we have some variant declared, resolve it
   // (use for opt-out citations extension)
+  //
+  // Note: this block reads from the captured `format` parameter (the
+  // construction-time snapshot). That is safe today because it runs
+  // synchronously before `renderPandoc`, i.e. before any post-construction
+  // reassignment of `recipe.format` (such as `withBookTitleMetadata`'s deep
+  // clone — see #14511). Any future code reading format state from this
+  // recipe AFTER `renderPandoc` has started must use `pandocOptions.format`
+  // / `recipe.format` (live), not the captured parameter.
   if (format.render?.[kVariant]) {
     const to = format.pandoc.to;
     const variant = format.render[kVariant];
diff --git a/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/.gitignore b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/.gitignore
new file mode 100644
index 00000000000..ad293093b07
--- /dev/null
+++ b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/.gitignore
@@ -0,0 +1,2 @@
+/.quarto/
+**/*.quarto_ipynb
diff --git a/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/_quarto.yml b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/_quarto.yml
new file mode 100644
index 00000000000..263d2ec86be
--- /dev/null
+++ b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/_quarto.yml
@@ -0,0 +1,12 @@
+project:
+  type: book
+
+brand: branding/brand.yml
+
+book:
+  title: "Brand font-paths in a Typst book"
+  author: "Quarto Test"
+  chapters:
+    - index.qmd
+
+format: typst
diff --git a/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/branding/brand.yml b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/branding/brand.yml
new file mode 100644
index 00000000000..4cee6c25605
--- /dev/null
+++ b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/branding/brand.yml
@@ -0,0 +1,8 @@
+typography:
+  fonts:
+    - family: "Amaranth"
+      source: file
+      files:
+        - fonts/Amaranth-Regular.ttf
+  base:
+    family: Amaranth
diff --git a/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/branding/fonts/Amaranth-Regular.ttf b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/branding/fonts/Amaranth-Regular.ttf
new file mode 100644
index 00000000000..944ccf7d0a5
Binary files /dev/null and b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/branding/fonts/Amaranth-Regular.ttf differ
diff --git a/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/index.qmd b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/index.qmd
new file mode 100644
index 00000000000..46afe7484aa
--- /dev/null
+++ b/tests/docs/smoke-all/typst/font-paths/brand-font-paths-book/index.qmd
@@ -0,0 +1,18 @@
+---
+title: "Brand font-paths in a Typst book (#14511)"
+include-in-header:
+  text: |
+    #set text(fallback: false)
+_quarto:
+  tests:
+    typst:
+      printsMessage:
+        level: INFO
+        regex: 'warning: unknown font family'
+        negate: true
+---
+
+```{=typst}
+#set text(font: "Amaranth")
+Testing brand font-paths in a book project.
+```