diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6a75f087f..76b080c6b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [Unreleased]
+
+### Fixed
+- Maven Socket facts honor artifact types that build extensions define, so they no longer list dependencies Maven doesn't resolve, or fetch files under the wrong extension.
+
 ## [1.15.0](https://github.com/SocketDev/socket-cli/releases/tag/v1.15.0) - 2026-11-12
 
 ### Added
diff --git a/src/commands/manifest/scripts/maven-extension/src/main/java/tech/coana/socket/SocketFactsRecordsEngine.java b/src/commands/manifest/scripts/maven-extension/src/main/java/tech/coana/socket/SocketFactsRecordsEngine.java
index 14e098e1e..0400d7680 100644
--- a/src/commands/manifest/scripts/maven-extension/src/main/java/tech/coana/socket/SocketFactsRecordsEngine.java
+++ b/src/commands/manifest/scripts/maven-extension/src/main/java/tech/coana/socket/SocketFactsRecordsEngine.java
@@ -168,7 +168,13 @@ public void run(MavenSession session, List<MavenProject> reactor, File rootDir,
       if (SocketSupport.isExcludedDir(excludeBase, module.getBasedir().toPath(), excludes)) continue;
       Map<String, Node> nodes = new LinkedHashMap<>();
       Set<String> directIds = new HashSet<>();
-      collectModule(session, module, passingScopes, reactorGavs, populateGavs, opts, nodes, directIds, failures, unscannable);
+      ClassLoader previous = Thread.currentThread().getContextClassLoader();
+      if (module.getClassRealm() != null) Thread.currentThread().setContextClassLoader(module.getClassRealm());
+      try {
+        collectModule(session, module, passingScopes, reactorGavs, populateGavs, opts, nodes, directIds, failures, unscannable);
+      } finally {
+        Thread.currentThread().setContextClassLoader(previous);
+      }
       rootIdx = emitModuleRoots(lines, rootIdx, projectKey(module), nodes, directIds);
     }
 
@@ -186,6 +192,8 @@ private static String projectKey(MavenProject module) {
 
   // ---- resolution ----
 
+  // Run inside the module's class realm, as Maven's LifecycleDependencyResolver does: artifact types
+  // the build extensions contribute are only found from there.
   private void collectModule(
       MavenSession session,
       MavenProject module,
diff --git a/src/commands/manifest/scripts/test/maven-compat/.gitignore b/src/commands/manifest/scripts/test/maven-compat/.gitignore
index eca432613..8c20122e9 100644
--- a/src/commands/manifest/scripts/test/maven-compat/.gitignore
+++ b/src/commands/manifest/scripts/test/maven-compat/.gitignore
@@ -19,3 +19,6 @@ descriptor-failure/*/target/
 unsolvable-conflict/records.tsv
 unsolvable-conflict/target/
 unsolvable-conflict/localrepo/
+extension-type/localrepo/
+extension-type/records.tsv
+extension-type/target/
diff --git a/src/commands/manifest/scripts/test/maven-compat/extension-type/pom.xml b/src/commands/manifest/scripts/test/maven-compat/extension-type/pom.xml
new file mode 100644
index 000000000..86e622b6f
--- /dev/null
+++ b/src/commands/manifest/scripts/test/maven-compat/extension-type/pom.xml
@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>demo</groupId>
+  <artifactId>extension-type</artifactId>
+  <version>1.0</version>
+  <properties>
+    <stub.repo.url>file://${maven.multiModuleProjectDirectory}/localrepo</stub.repo.url>
+  </properties>
+  <repositories>
+    <repository>
+      <id>socket-stubs</id>
+      <url>${stub.repo.url}</url>
+      <releases>
+        <enabled>true</enabled>
+        <checksumPolicy>ignore</checksumPolicy>
+      </releases>
+      <snapshots>
+        <enabled>false</enabled>
+      </snapshots>
+    </repository>
+  </repositories>
+  <pluginRepositories>
+    <pluginRepository>
+      <id>socket-stubs</id>
+      <url>${stub.repo.url}</url>
+      <releases>
+        <enabled>true</enabled>
+        <checksumPolicy>ignore</checksumPolicy>
+      </releases>
+      <snapshots>
+        <enabled>false</enabled>
+      </snapshots>
+    </pluginRepository>
+  </pluginRepositories>
+  <!-- types-ext defines type fat: a jar that includes its dependencies, so Maven does not resolve
+       demo.ext:inner below demo.ext:fat. -->
+  <dependencies>
+    <dependency>
+      <groupId>demo.ext</groupId>
+      <artifactId>fat</artifactId>
+      <version>1.0</version>
+      <type>fat</type>
+    </dependency>
+  </dependencies>
+  <build>
+    <extensions>
+      <extension>
+        <groupId>demo.ext</groupId>
+        <artifactId>types-ext</artifactId>
+        <version>1.0</version>
+      </extension>
+    </extensions>
+  </build>
+</project>
diff --git a/src/commands/manifest/scripts/test/maven-compat/smoke-test-extension-type.sh b/src/commands/manifest/scripts/test/maven-compat/smoke-test-extension-type.sh
new file mode 100755
index 000000000..b941c41f6
--- /dev/null
+++ b/src/commands/manifest/scripts/test/maven-compat/smoke-test-extension-type.sh
@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+# Regression guard: an artifact type a build extension defines must apply as it does in Maven's own
+# resolution. Type fat, from the types-ext extension, includes its dependencies and is a jar on disk,
+# so demo.ext:inner below demo.ext:fat must not be emitted, and --with-files must fetch fat-1.0.jar.
+#
+# Usage: smoke-test-extension-type.sh <path-to-mvn> <path-to-extension-jar>
+set -euo pipefail
+HERE="$(cd "$(dirname "$0")" && pwd)"
+MVN="${1:?usage: smoke-test-extension-type.sh <mvn> <extension-jar>}"
+JAR="${2:?usage: smoke-test-extension-type.sh <mvn> <extension-jar>}"
+PROJECT="$HERE/extension-type"
+RECORDS="$PROJECT/records.tsv"
+STUBS="$PROJECT/localrepo"
+# shellcheck source=SCRIPTDIR/../compat-cache.sh
+. "$HERE/../compat-cache.sh"
+M2="$SOCKET_COMPAT_CACHE/m2"
+
+bash "$HERE/../make-stub-repo.sh" "$STUBS" \
+  'demo.ext:types-ext:1.0' \
+  'demo.ext:fat:1.0+demo.ext:inner:1.0' \
+  'demo.ext:inner:1.0'
+# The extension is a components.xml registering Maven's own handler class for type fat.
+EXT_DIR="$(mktemp -d)"
+trap 'rm -rf "$EXT_DIR"' EXIT
+mkdir -p "$EXT_DIR/META-INF/plexus"
+cat > "$EXT_DIR/META-INF/plexus/components.xml" <<'XML'
+<component-set>
+  <components>
+    <component>
+      <role>org.apache.maven.artifact.handler.ArtifactHandler</role>
+      <role-hint>fat</role-hint>
+      <implementation>org.apache.maven.artifact.handler.DefaultArtifactHandler</implementation>
+      <configuration>
+        <type>fat</type>
+        <extension>jar</extension>
+        <includesDependencies>true</includesDependencies>
+      </configuration>
+    </component>
+  </components>
+</component-set>
+XML
+( cd "$EXT_DIR" && jar cf "$STUBS/demo/ext/types-ext/1.0/types-ext-1.0.jar" META-INF )
+rm -rf "$M2/demo/ext/types-ext" "$M2/demo/ext/fat" "$M2/demo/ext/inner" "$RECORDS"
+
+echo "+ $("$MVN" -v 2>/dev/null | head -1) (extension type)"
+( cd "$PROJECT" && "$MVN" --batch-mode -q \
+    "-Dmaven.ext.class.path=$JAR" \
+    -Dcoana.task=socket-facts \
+    -Dsocket.withFiles=true \
+    "-Dmaven.repo.local=$M2" \
+    "-Dstub.repo.url=file://$STUBS" \
+    "-Dsocket.recordsFile=$RECORDS" \
+    validate )
+
+python3 - "$RECORDS" <<'PY'
+import sys
+rows = [l.rstrip('\n').split('\t') for l in open(sys.argv[1]) if l.strip()]
+nodes = {r[2] for r in rows if r[0] == 'node'}
+files = {r[3] for r in rows if r[0] == 'file' and r[2].startswith('demo.ext:fat:')}
+failures = [r[1:] for r in rows if r[0] in ('failure', 'unscannable')]
+errors = []
+if not any(n.startswith('demo.ext:fat:') for n in nodes):
+    errors.append(f"demo.ext:fat missing; nodes={sorted(nodes)}")
+if any(n.startswith('demo.ext:inner:') for n in nodes):
+    errors.append("demo.ext:inner emitted, though type fat includes its dependencies")
+if not any(p.endswith('fat-1.0.jar') for p in files):
+    errors.append(f"fat-1.0.jar not materialized; files={sorted(files)}")
+if failures:
+    errors.append(f"no failures expected; got {failures}")
+if errors:
+    print("FAIL:")
+    for e in errors:
+        print("  -", e)
+    sys.exit(1)
+print("PASS (extension type): fat emitted as a jar, inner not resolved below it")
+PY
diff --git a/src/commands/manifest/scripts/test/run-compat.sh b/src/commands/manifest/scripts/test/run-compat.sh
index 3e503016e..e21ded508 100755
--- a/src/commands/manifest/scripts/test/run-compat.sh
+++ b/src/commands/manifest/scripts/test/run-compat.sh
@@ -118,6 +118,7 @@ run_maven() {
     bash "$HERE/maven-compat/smoke-test-graph-failure.sh" "$dir/bin/mvn" "$jar"
     bash "$HERE/maven-compat/smoke-test-descriptor-failure.sh" "$dir/bin/mvn" "$jar"
     bash "$HERE/maven-compat/smoke-test-unsolvable-conflict.sh" "$dir/bin/mvn" "$jar"
+    bash "$HERE/maven-compat/smoke-test-extension-type.sh" "$dir/bin/mvn" "$jar"
   done
 }