fix(sse): stop unhydrated compatible connections routing to the real OpenAI/Anthropic API (#13452)

Root cause: BaseExecutor/DefaultExecutor.buildUrl() silently defaulted an
openai-compatible-*/anthropic-compatible-* connection to the real
OpenAI/Anthropic API when providerSpecificData.baseUrl was absent, shipping
the connection's own stored credential to a public third party. baseUrl is
only ever stamped at write time by two routes; a connection created outside
those (direct DB insert, pre-hydration row, node-update race) reproduced
this bug.

Fix: buildUrl() now throws instead of defaulting (requireCompatibleBaseUrl
in providerRegistry.ts), and the credential-selection read path
(auth.ts -> compatibleNodeBaseUrl.ts) self-heals by re-joining
provider_nodes via the existing cache before a request ever reaches the
executor.

Regression test: tests/unit/issue-13452-node-baseurl-ignored.test.ts

changelog.d/fixes/13452-provider-node-baseurl-ignored.md

@@ -0,0 +1 @@
+- **fix(sse):** stop an unhydrated `openai-compatible-*`/`anthropic-compatible-*` connection from silently routing chat requests (and its stored credential) to the real OpenAI/Anthropic API instead of the operator's configured provider-node endpoint (#13452) — thanks @DenXio101

open-sse/config/providerRegistry.ts

@@ -319,3 +319,24 @@ export function getClaudeCodeDefaultModels(): {
     haiku: find(/haiku/i),
   };
 }
+
+/**
+ * #13452: shared guard for `*-compatible-*` executors' `buildUrl()`.
+ * `BaseExecutor`/`DefaultExecutor` used to default an `openai-compatible-*`
+ * / `anthropic-compatible-*` connection to the real OpenAI/Anthropic API
+ * when `credentials.providerSpecificData.baseUrl` was absent — silently
+ * shipping the connection's own stored "API key" as a Bearer/x-api-key
+ * token to a public third party instead of the operator's intended
+ * local/self-hosted endpoint. `provider` is embedded in the thrown error
+ * only for operator debuggability — it is never sent upstream.
+ */
+export function requireCompatibleBaseUrl(
+  provider: string | null | undefined,
+  providerSpecificData: { baseUrl?: unknown } | null | undefined
+): string {
+  const baseUrl = providerSpecificData?.baseUrl;
+  if (typeof baseUrl === "string" && baseUrl) return baseUrl;
+  throw new Error(
+    `provider node "${provider}" has no baseUrl — node missing or connection not hydrated`
+  );
+}

open-sse/executors/base.ts

@@ -1,5 +1,5 @@
 import { HTTP_STATUS, FETCH_TIMEOUT_MS } from "../config/constants.ts";
-import { getRegistryEntry } from "../config/providerRegistry.ts";
+import { getRegistryEntry, requireCompatibleBaseUrl } from "../config/providerRegistry.ts";
 import { resolveFetchStartTimeout } from "../utils/fetchStartTimeoutPolicy.ts";
 import {
   resolveAlternateFormat,
@@ -30,7 +30,7 @@ import {
   addParamToBlocklist,
   isAutoLearnGloballyEnabled,
 } from "@/lib/db/paramFilters";
-import { applyFingerprint, isCliCompatEnabled, stripInternalBodyFields } from "../config/cliFingerprints.ts";
+import { applyFingerprint, isCliCompatEnabled, stripInternalBodyFields } from "../config/cliFingerprints.ts"; // prettier-ignore
 import { supportsClaudeMaxEffort, supportsXHighEffort } from "../config/providerModels.ts";
 import { getThinkingBudgetConfig, ThinkingMode } from "../services/thinkingBudget.ts";
 import {
@@ -380,7 +380,7 @@ export class BaseExecutor {
     void stream;
     if (this.provider?.startsWith?.("openai-compatible-")) {
       const psd = credentials?.providerSpecificData;
-      const baseUrl = typeof psd?.baseUrl === "string" ? psd.baseUrl : "https://api.openai.com/v1";
+      const baseUrl = requireCompatibleBaseUrl(this.provider, psd); // #13452
       const normalized = baseUrl.replace(/\/$/, "");
       // Sanitize custom path: must start with '/', no path traversal, no null bytes
       const rawPath = typeof psd?.chatPath === "string" && psd.chatPath ? psd.chatPath : null;

open-sse/executors/default.ts

@@ -11,7 +11,7 @@ import {
   joinClaudeCodeCompatibleUrl,
 } from "../services/claudeCodeCompatible.ts";
 import { getGigachatAccessToken } from "../services/gigachatAuth.ts";
-import { getRegistryEntry } from "../config/providerRegistry.ts";
+import { getRegistryEntry, requireCompatibleBaseUrl } from "../config/providerRegistry.ts";
 import { getModelTargetFormat } from "../config/providerModels.ts";
 import {
   mergeClientAnthropicBeta,
@@ -231,7 +231,7 @@ export class DefaultExecutor extends BaseExecutor {
     void urlIndex;
     if (this.provider?.startsWith?.("openai-compatible-")) {
       const psd = credentials?.providerSpecificData;
-      const baseUrl = psd?.baseUrl || "https://api.openai.com/v1";
+      const baseUrl = requireCompatibleBaseUrl(this.provider, psd); // #13452
       const normalized = baseUrl.replace(/\/$/, "");
       const customPath = typeof psd?.chatPath === "string" && psd.chatPath ? psd.chatPath : null;
       if (customPath) return `${normalized}${customPath}`;
@@ -244,7 +244,7 @@ export class DefaultExecutor extends BaseExecutor {
     }
     if (this.provider?.startsWith?.("anthropic-compatible-")) {
       const psd = credentials?.providerSpecificData;
-      const baseUrl = psd?.baseUrl || "https://api.anthropic.com/v1";
+      const baseUrl = requireCompatibleBaseUrl(this.provider, psd); // #13452
       const customPath = typeof psd?.chatPath === "string" && psd.chatPath ? psd.chatPath : null;
       if (isClaudeCodeCompatible(this.provider)) {
         return joinClaudeCodeCompatibleUrl(

src/sse/services/auth.ts

@@ -1,5 +1,6 @@
 import { randomUUID } from "crypto";
 import { nodeTypeFromId } from "@/lib/db/providerNodeSelect";
+import { hydrateConnectionProviderSpecificData } from "./compatibleNodeBaseUrl.ts"; // #13452
 import { extractGoogApiKeyHeader } from "./googApiKeyAuth.ts";
 import { describeUpstreamFailure } from "@/shared/utils/upstreamError";
 import { buildAllExpiredCredentials } from "./authExpiredCredentials.ts";
@@ -1039,33 +1040,6 @@ function planLastUsedCommit(
   };
 }
 
-/**
- * Resolve Proxy Pool references on a real connection row at the same boundary
- * where credentials become request-ready. The synthetic no-auth fallback above
- * already performs this hydration, but a persisted connection (for example the
- * OpenCode card's `opencode` row selected through the `opencode-zen` alias)
- * bypasses that fallback. Keep inline/legacy entries untouched and only incur a
- * registry lookup when at least one by-id reference is present.
- */
-async function hydrateAccountProxyReferences(
-  providerSpecificData: JsonRecord
-): Promise<JsonRecord> {
-  const entries = providerSpecificData.accountProxies;
-  if (!Array.isArray(entries)) return providerSpecificData;
-
-  const containsProxyReference = entries.some((entry) => {
-    if (!entry || typeof entry !== "object" || Array.isArray(entry)) return false;
-    const proxyId = (entry as Record<string, unknown>).proxyId;
-    return typeof proxyId === "string" && proxyId.trim().length > 0;
-  });
-  if (!containsProxyReference) return providerSpecificData;
-
-  return {
-    ...providerSpecificData,
-    accountProxies: await resolveAccountProxiesFromRegistry(entries),
-  };
-}
-
 async function materializeConnection(
   connection: ProviderConnectionView,
   options: CredentialSelectionOptions,
@@ -1074,7 +1048,7 @@ async function materializeConnection(
     reactivatedFromInactive?: boolean;
   } = {}
 ) {
-  const providerSpecificData = await hydrateAccountProxyReferences(connection.providerSpecificData);
+  const providerSpecificData = await hydrateConnectionProviderSpecificData(connection);
   const apiKeyHealth = providerSpecificData.apiKeyHealth as Record<string, KeyHealth> | undefined;
   if (apiKeyHealth) syncHealthFromDB(connection.id, apiKeyHealth);
   const releaseOAuthSession =

src/sse/services/compatibleNodeBaseUrl.ts

@@ -0,0 +1,95 @@
+/**
+ * #13452: self-heal a `*-compatible-*` connection whose `providerSpecificData`
+ * never received the write-time `baseUrl` copy (`POST /api/providers`'s
+ * hydration branch, or the `PUT /api/provider-nodes/{id}` backfill loop are
+ * the only two places that stamp it). A connection created any other way —
+ * a direct DB insert, a row that predates the hydration logic, or a race
+ * with node update/deletion — has no `providerSpecificData.baseUrl` at all
+ * and, left unfixed, `DefaultExecutor.buildUrl()`/`BaseExecutor.buildUrl()`
+ * silently defaulted to the REAL OpenAI/Anthropic API, shipping the
+ * connection's own stored credential there as a Bearer/x-api-key token.
+ *
+ * Extracted out of `auth.ts` into its own module (`file-size-baseline.json`
+ * freezes `auth.ts`'s line count).
+ *
+ * @module sse/services/compatibleNodeBaseUrl
+ */
+
+import { getCachedProviderNodes } from "@/lib/db/readCache";
+import { selectProviderNodeForConnection } from "@/lib/db/providerNodeSelect";
+import { isCompatibleProviderConnectionId } from "@/shared/utils/compatibleProviderId";
+import { resolveAccountProxiesFromRegistry } from "./noAuthProxyResolution";
+
+type JsonRecord = Record<string, unknown>;
+
+/**
+ * Composes both boundary-hydration steps a persisted connection's
+ * `providerSpecificData` needs before it becomes request-ready credentials:
+ * Proxy Pool by-id references (moved here from `auth.ts` verbatim — was
+ * `hydrateAccountProxyReferences`), then the `*-compatible-*` baseUrl
+ * self-heal below. Keep inline/legacy `accountProxies` entries untouched and
+ * only incur a proxy-registry lookup when at least one by-id reference is
+ * present.
+ */
+export async function hydrateConnectionProviderSpecificData(connection: {
+  provider: string;
+  providerSpecificData: JsonRecord;
+}): Promise<JsonRecord> {
+  const { providerSpecificData } = connection;
+  const entries = providerSpecificData.accountProxies;
+  const containsProxyReference =
+    Array.isArray(entries) &&
+    entries.some((entry) => {
+      if (!entry || typeof entry !== "object" || Array.isArray(entry)) return false;
+      const proxyId = (entry as Record<string, unknown>).proxyId;
+      return typeof proxyId === "string" && proxyId.trim().length > 0;
+    });
+  const proxyHydrated = containsProxyReference
+    ? { ...providerSpecificData, accountProxies: await resolveAccountProxiesFromRegistry(entries) }
+    : providerSpecificData;
+  return hydrateCompatibleNodeBaseUrl(connection.provider, proxyHydrated);
+}
+
+/**
+ * Re-joins `provider_nodes` (via the existing 5s-TTL cache, so this is not
+ * an extra DB read on the hot path) and stamps the same fields the write-time
+ * hydration branch stamps. Returns `providerSpecificData` unchanged when the
+ * connection is not a compatible-node connection, already carries a
+ * `baseUrl`, or no matching node can be resolved (the executor's fail-loud
+ * fallback then reports the true "node missing" condition instead of
+ * silently routing to a public third party).
+ */
+async function hydrateCompatibleNodeBaseUrl(
+  provider: string,
+  providerSpecificData: JsonRecord
+): Promise<JsonRecord> {
+  if (typeof providerSpecificData.baseUrl === "string" && providerSpecificData.baseUrl) {
+    return providerSpecificData;
+  }
+  if (!isCompatibleProviderConnectionId(provider)) return providerSpecificData;
+
+  try {
+    const nodes = (await getCachedProviderNodes()) as JsonRecord[];
+    const node = selectProviderNodeForConnection(provider, nodes);
+    if (!node || typeof node.baseUrl !== "string" || !node.baseUrl) return providerSpecificData;
+
+    return {
+      ...providerSpecificData,
+      prefix: providerSpecificData.prefix ?? node.prefix,
+      apiType: providerSpecificData.apiType ?? node.apiType,
+      baseUrl: node.baseUrl,
+      nodeName: providerSpecificData.nodeName ?? node.name,
+      ...(node.chatPath && !providerSpecificData.chatPath ? { chatPath: node.chatPath } : {}),
+      ...(node.modelsPath && !providerSpecificData.modelsPath
+        ? { modelsPath: node.modelsPath }
+        : {}),
+      ...(node.customHeaders && !providerSpecificData.customHeaders
+        ? { customHeaders: node.customHeaders }
+        : {}),
+    };
+  } catch {
+    // Best-effort self-heal only — a transient DB/cache read failure must
+    // not throw here; the executor's own fail-loud fallback is the backstop.
+    return providerSpecificData;
+  }
+}

tests/unit/executor-default-base.test.ts

@@ -601,9 +601,8 @@ test("DefaultExecutor.execute uses CC-compatible connection defaults to append 1
       stream: false,
       credentials: {
         apiKey: "cc-key",
-        providerSpecificData: {
-          ccSessionId: "session-1",
-        },
+        // #13452: buildUrl() now requires a hydrated baseUrl.
+        providerSpecificData: { ccSessionId: "session-1", baseUrl: "https://cc.test/v1" },
       },
       clientHeaders: {
         "x-app": "cli",
@@ -623,6 +622,7 @@ test("DefaultExecutor.execute uses CC-compatible connection defaults to append 1
         apiKey: "cc-key",
         providerSpecificData: {
           ccSessionId: "session-1",
+          baseUrl: "https://cc.test/v1",
           requestDefaults: { context1m: true, redactThinking: true },
         },
       },
@@ -658,6 +658,7 @@ test("DefaultExecutor.execute uses CC-compatible connection defaults to append 1
         apiKey: "cc-key",
         providerSpecificData: {
           ccSessionId: "session-1",
+          baseUrl: "https://cc-proxy.example.test/v1",
           requestDefaults: { context1m: true },
         },
       },
@@ -734,9 +735,7 @@ test("DefaultExecutor.execute reports the exact serialized provider request befo
         stream: false,
         credentials: {
           apiKey: "cc-key",
-          providerSpecificData: {
-            ccSessionId: "session-1",
-          },
+          providerSpecificData: { ccSessionId: "session-1", baseUrl: "https://cc.test/v1" }, // #13452
         },
       })
     );

tests/unit/issue-13452-node-baseurl-ignored.test.ts

@@ -0,0 +1,66 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import { DefaultExecutor } from "../../open-sse/executors/default.ts";
+import { BaseExecutor } from "../../open-sse/executors/base.ts";
+
+// Issue #13452 — Bug 2: a provider-node ("openai-compatible-*" /
+// "anthropic-compatible-*") connection whose credentials carry no
+// providerSpecificData.baseUrl (e.g. a connection created any way other than
+// the exact POST /api/providers hydration branch, or the node-update
+// backfill loop) used to silently fall back to the literal
+// "https://api.openai.com/v1" / "https://api.anthropic.com/v1" instead of
+// erroring or re-resolving the node's configured baseUrl. Real traffic meant
+// for a local OpenAI-compatible endpoint (Ollama/vLLM/LM Studio) was instead
+// sent to the real OpenAI API, carrying whatever string was stored as the
+// "API key" as a Bearer token to a public third party.
+//
+// Fix: buildUrl() now fails loudly (throws) instead of defaulting, and the
+// credential-selection read path (src/sse/services/auth.ts) self-heals by
+// re-joining provider_nodes before a request ever reaches buildUrl().
+
+test("issue #13452: DefaultExecutor openai-compatible buildUrl must not silently fall back to the real OpenAI API when providerSpecificData.baseUrl is absent", () => {
+  const nodeId = "openai-compatible-chat-test-node";
+  const executor = new DefaultExecutor(nodeId);
+
+  // Simulates the credentials row a hand-created / non-hydrated connection
+  // produces: no providerSpecificData.baseUrl at all, even though the node
+  // itself (in provider_nodes) has baseUrl = "http://localhost:11434/v1".
+  const credentialsWithoutHydration = { apiKey: "ollama" };
+
+  assert.throws(
+    () => executor.buildUrl("qwen3.6:35b-a3b", false, 0, credentialsWithoutHydration),
+    /baseUrl/,
+    "buildUrl() must fail loudly instead of silently defaulting an unhydrated openai-compatible " +
+      "connection to the real OpenAI API — this WAS the reported bug (#13452)"
+  );
+});
+
+test("issue #13452: BaseExecutor openai-compatible buildUrl must not silently fall back to the real OpenAI API when providerSpecificData.baseUrl is absent", () => {
+  const executor = new BaseExecutor("openai-compatible-responses-test-node", {});
+
+  assert.throws(() => executor.buildUrl("gpt-5.4", true, 0, { apiKey: "local-key" }), /baseUrl/);
+});
+
+test("issue #13452: DefaultExecutor anthropic-compatible buildUrl must not silently fall back to the real Anthropic API when providerSpecificData.baseUrl is absent", () => {
+  const executor = new DefaultExecutor("anthropic-compatible-test-node");
+
+  assert.throws(
+    () => executor.buildUrl("claude-sonnet-4-6", true, 0, { apiKey: "local-key" }),
+    /baseUrl/
+  );
+});
+
+test("issue #13452 (control): providing providerSpecificData.baseUrl routes correctly (confirms the fallback, not buildUrl() itself, was the defect)", () => {
+  const nodeId = "openai-compatible-chat-test-node-2";
+  const executor = new DefaultExecutor(nodeId);
+
+  const hydratedCredentials = {
+    apiKey: "ollama",
+    providerSpecificData: { baseUrl: "http://localhost:11434/v1" },
+  };
+
+  const url = executor.buildUrl("qwen3.6:35b-a3b", false, 0, hydratedCredentials);
+
+  assert.equal(url, "http://localhost:11434/v1/chat/completions");
+});