fix(remote): verify the pinned checksum on remote cache hits

CHANGELOG.md

@@ -56,6 +56,8 @@
   reports exit code `124`. Callers that join a `run: once` or `when_changed`
   task already running now honor their own `timeout`, and inherit that task's
   failure instead of being told it succeeded (#1569, #2898 by @vmaerten).
+- Fixed a pinned `checksum:` not being verified when a remote Taskfile came from
+  the cache (#2980 by @vmaerten).
 
 ## v3.52.0 - 2026-07-02
 

taskfile/reader.go

@@ -457,7 +457,10 @@ func (r *Reader) readNodeContent(ctx context.Context, node Node) ([]byte, error)
 		return nil, err
 	}
 
-	// If the given checksum doesn't match the sum pinned in the Taskfile
+	return verifyPinnedChecksum(node, b)
+}
+
+func verifyPinnedChecksum(node Node, b []byte) ([]byte, error) {
 	checksum := checksum(b)
 	if !node.Verify(checksum) {
 		return nil, &errors.TaskfileDoesNotMatchChecksum{
@@ -466,7 +469,6 @@ func (r *Reader) readNodeContent(ctx context.Context, node Node) ([]byte, error)
 			ActualChecksum:   checksum,
 		}
 	}
-
 	return b, nil
 }
 
@@ -475,7 +477,7 @@ func (r *Reader) readRemoteNodeContent(ctx context.Context, node RemoteNode) ([]
 	now := time.Now().UTC()
 	timestamp := cache.ReadTimestamp()
 	expiry := timestamp.Add(r.cacheExpiryDuration)
-	cacheValid := now.Before(expiry)
+	cacheValid := !timestamp.After(now) && now.Before(expiry)
 	var cacheFound bool
 
 	r.debugf("checking cache for %q in %q\n", node.Location(), cache.Location())
@@ -498,7 +500,7 @@ func (r *Reader) readRemoteNodeContent(ctx context.Context, node RemoteNode) ([]
 		// If we can't fetch a fresh copy, we should use the cache anyway
 		if r.offline {
 			r.debugf("in offline mode, using expired cache\n")
-			return cachedBytes, nil
+			return verifyPinnedChecksum(node, cachedBytes)
 		}
 
 	// Some other error
@@ -510,7 +512,7 @@ func (r *Reader) readRemoteNodeContent(ctx context.Context, node RemoteNode) ([]
 		r.debugf("cache found\n")
 		// Not being forced to redownload, return cache
 		if !r.download {
-			return cachedBytes, nil
+			return verifyPinnedChecksum(node, cachedBytes)
 		}
 		cacheFound = true
 	}
@@ -526,7 +528,7 @@ func (r *Reader) readRemoteNodeContent(ctx context.Context, node RemoteNode) ([]
 			} else {
 				r.debugf("failed to fetch remote file: %s: using expired cache\n", ctx.Err().Error())
 			}
-			return cachedBytes, nil
+			return verifyPinnedChecksum(node, cachedBytes)
 		}
 		return nil, err
 	}