diff --git a/lib/start-proxy-action.js b/lib/start-proxy-action.js
index 8e7ad825d6..855a351ea5 100644
--- a/lib/start-proxy-action.js
+++ b/lib/start-proxy-action.js
@@ -34,6 +34,7 @@ var __importStar = (this && this.__importStar) || (function () {
 })();
 Object.defineProperty(exports, "__esModule", { value: true });
 const child_process_1 = require("child_process");
+const fs = __importStar(require("fs"));
 const path = __importStar(require("path"));
 const core = __importStar(require("@actions/core"));
 const toolcache = __importStar(require("@actions/tool-cache"));
@@ -111,6 +112,16 @@ async function runWrapper() {
         all_credentials: credentials,
         ca,
     };
+    // Try to write the certificate to disk. Some extractors may use this to populate
+    // the `SSL_CERT_FILE` environment variable.
+    try {
+        const certificatePath = path.join(actionsUtil.getTemporaryDirectory(), "codeql_package_proxy.crt");
+        fs.writeFileSync(certificatePath, ca.cert);
+        proxyConfig.ca_certificate_file = certificatePath;
+    }
+    catch (error) {
+        logger.error(`Failed to write the proxy certificate to disk: ${util.getErrorMessage(error)}`);
+    }
     // Start the Proxy
     const proxyBin = await getProxyBinaryPath();
     await startProxy(proxyBin, proxyConfig, proxyLogFilePath, logger);
@@ -154,6 +165,7 @@ async function startProxy(binPath, config, logFilePath, logger) {
         core.setOutput("proxy_host", host);
         core.setOutput("proxy_port", port.toString());
         core.setOutput("proxy_ca_certificate", config.ca.cert);
+        core.setOutput("proxy_ca_certificate_file", config.ca_certificate_file);
         const registry_urls = config.all_credentials
             .filter((credential) => credential.url !== undefined)
             .map((credential) => ({
diff --git a/lib/start-proxy-action.js.map b/lib/start-proxy-action.js.map
index ab67cea0dc..10371d788d 100644
--- a/lib/start-proxy-action.js.map
+++ b/lib/start-proxy-action.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/start-proxy-action.ts b/src/start-proxy-action.ts
index a6da812e64..e801a0becb 100644
--- a/src/start-proxy-action.ts
+++ b/src/start-proxy-action.ts
@@ -1,4 +1,5 @@
 import { ChildProcess, spawn } from "child_process";
+import * as fs from "fs";
 import * as path from "path";
 
 import * as core from "@actions/core";
@@ -29,6 +30,7 @@ type BasicAuthCredentials = {
 
 type ProxyConfig = {
   all_credentials: Credential[];
+  ca_certificate_file?: string;
   ca: CertificateAuthority;
   proxy_auth?: BasicAuthCredentials;
 };
@@ -118,6 +120,22 @@ async function runWrapper() {
     ca,
   };
 
+  // Try to write the certificate to disk. Some extractors may use this to populate
+  // the `SSL_CERT_FILE` environment variable.
+  try {
+    const certificatePath = path.join(
+      actionsUtil.getTemporaryDirectory(),
+      "codeql_package_proxy.crt",
+    );
+    fs.writeFileSync(certificatePath, ca.cert);
+
+    proxyConfig.ca_certificate_file = certificatePath;
+  } catch (error) {
+    logger.error(
+      `Failed to write the proxy certificate to disk: ${util.getErrorMessage(error)}`,
+    );
+  }
+
   // Start the Proxy
   const proxyBin = await getProxyBinaryPath();
   await startProxy(proxyBin, proxyConfig, proxyLogFilePath, logger);
@@ -171,6 +189,7 @@ async function startProxy(
     core.setOutput("proxy_host", host);
     core.setOutput("proxy_port", port.toString());
     core.setOutput("proxy_ca_certificate", config.ca.cert);
+    core.setOutput("proxy_ca_certificate_file", config.ca_certificate_file);
 
     const registry_urls = config.all_credentials
       .filter((credential) => credential.url !== undefined)