diff --git a/CHANGELOG.md b/CHANGELOG.md
index a4f4197..477fd55 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
 where applicable.
 
+## 1.1.10 — 2026-10-16
+
+- Require Symfony YAML 8.1.6 or newer to exclude the inline lexer recursion issue CVE-2026-109413.
+- Require Symfony HttpFoundation 8.1.9 or newer for the CVE-2026-108082 header parser fix and its whitespace-separator correction.
+- Verify dependency version boundaries, bounded expression and YAML parsing, and header splitting without changing trusted configuration inputs.
+
 ## 1.1.9 — 2026-10-15
 
 - Require Symfony ExpressionLanguage 8.1.9 or newer to exclude releases affected by CVE-2026-109449.
diff --git a/composer.json b/composer.json
index 2b2f8e7..293bd22 100644
--- a/composer.json
+++ b/composer.json
@@ -24,13 +24,14 @@
         "symfony/event-dispatcher": "^8.0",
         "symfony/expression-language": "^8.1.9",
         "symfony/filesystem": "^8.0",
-        "symfony/http-foundation": "^8.1",
+        "symfony/http-foundation": "^8.1.9",
         "symfony/http-kernel": "^8.1",
         "symfony/routing": "^8.1",
         "symfony/service-contracts": "^3.6",
-        "symfony/yaml": "^8.1"
+        "symfony/yaml": "^8.1.6"
     },
     "require-dev": {
+        "composer/semver": "^3.4",
         "sympress/qa": "^0.1.2"
     },
     "autoload": {
diff --git a/docs/dependency-injection.md b/docs/dependency-injection.md
index 9dd30e7..c765b5b 100644
--- a/docs/dependency-injection.md
+++ b/docs/dependency-injection.md
@@ -21,7 +21,7 @@ build, configure, dump, and run the container:
     "symfony/expression-language": "^8.1.9",
     "symfony/filesystem": "^8.0",
     "symfony/service-contracts": "^3.6",
-    "symfony/yaml": "^8.1"
+    "symfony/yaml": "^8.1.6"
   }
 }
 ```
diff --git a/tests/Security/SymfonySecurityCompatibilityTest.php b/tests/Security/SymfonySecurityCompatibilityTest.php
new file mode 100644
index 0000000..fec5c10
--- /dev/null
+++ b/tests/Security/SymfonySecurityCompatibilityTest.php
@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SymPress\Kernel\Tests\Security;
+
+use Composer\Semver\Semver;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\ExpressionLanguage;
+use Symfony\Component\ExpressionLanguage\SyntaxError;
+use Symfony\Component\HttpFoundation\HeaderUtils;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Yaml\Exception\ParseException;
+use Symfony\Component\Yaml\Parser;
+
+final class SymfonySecurityCompatibilityTest extends TestCase
+{
+    #[DataProvider('dependencyBoundaries')]
+    public function testDeclaredRequirementsExcludeUnsafeVersions(string $package, string $rejected, string $accepted): void
+    {
+        /** @var array{require: array<string, string>} $manifest */
+        $manifest = json_decode((string) file_get_contents(dirname(__DIR__, 2) . '/composer.json'), true, flags: JSON_THROW_ON_ERROR);
+
+        self::assertFalse(Semver::satisfies($rejected, $manifest['require'][$package]));
+        self::assertTrue(Semver::satisfies($accepted, $manifest['require'][$package]));
+    }
+
+    /** @return iterable<string, array{string, string, string}> */
+    public static function dependencyBoundaries(): iterable
+    {
+        yield 'expression initial incomplete fix' => ['symfony/expression-language', '8.1.6', '8.1.9'];
+        yield 'expression last affected patch' => ['symfony/expression-language', '8.1.8', '8.1.9'];
+        yield 'yaml inline lexer' => ['symfony/yaml', '8.1.5', '8.1.6'];
+        yield 'header parser' => ['symfony/http-foundation', '8.1.6', '8.1.9'];
+        yield 'header whitespace separator regression' => ['symfony/http-foundation', '8.1.8', '8.1.9'];
+    }
+
+    #[DataProvider('deepExpressions')]
+    public function testDependencyInjectionRejectsDeepExpressions(string $expression): void
+    {
+        $this->expectException(SyntaxError::class);
+        $this->expectExceptionMessage('maximum nesting level is 256');
+
+        (new ExpressionLanguage())->lint($expression, []);
+    }
+
+    /** @return iterable<string, array{string}> */
+    public static function deepExpressions(): iterable
+    {
+        yield 'unary nesting' => [str_repeat('!', 300) . '1'];
+
+        $expression = '1';
+        for ($level = 0; $level < 60; ++$level) {
+            $expression = '(' . $expression . str_repeat(' + 1', 60) . ')';
+        }
+        yield 'chained binary nesting missed by 8.1.6' => [$expression];
+    }
+
+    public function testOrdinaryDependencyInjectionExpressionStillWorks(): void
+    {
+        self::assertSame(3, (new ExpressionLanguage())->evaluate('1 + 2'));
+    }
+
+    public function testInlineYamlLexerHonorsConfiguredNestingLimit(): void
+    {
+        $parser = new Parser(8);
+        self::assertSame(['root' => [[1]]], $parser->parse('root: [[1]]'));
+
+        $this->expectException(ParseException::class);
+        $this->expectExceptionMessage('Maximum nesting depth of 8 exceeded');
+
+        $parser->parse('root: ' . str_repeat('[', 9));
+    }
+
+    public function testCacheControlDirectivesSurviveWhitespaceBeforeSeparator(): void
+    {
+        $request = new Request(server: ['HTTP_CACHE_CONTROL' => 'private' . str_repeat(' ', 32) . ', max-age=0']);
+
+        self::assertTrue($request->headers->hasCacheControlDirective('private'));
+        self::assertSame('0', $request->headers->getCacheControlDirective('max-age'));
+    }
+
+    public function testHeaderParserSupportsWhitespaceSeparators(): void
+    {
+        self::assertSame(['foo', 'bar'], HeaderUtils::split('foo bar', ' '));
+    }
+}