How severe is CVE-2026-35337?

CVE-2026-35337 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-35337 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35337?

CVE-2026-35337 affects Apache Storm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35337?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-35337 have an EU (EUVD) identifier?

Yes. CVE-2026-35337 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21902.

When was CVE-2026-35337 published?

CVE-2026-35337 was published on 2026-04-13 and last updated on 2026-06-17.

CVE-2026-35337

CVE-2026-35337 is a high-severity vulnerability in Apache Storm with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21902
Weakness: CWE-502
Affected product: Apache Storm
Published: 2026-04-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-35337?: 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.
How severe is CVE-2026-35337?: CVE-2026-35337 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-35337 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35337?: CVE-2026-35337 affects Apache Storm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35337?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-35337 have an EU (EUVD) identifier?: Yes. CVE-2026-35337 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21902.
When was CVE-2026-35337 published?: CVE-2026-35337 was published on 2026-04-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:*

More vulnerabilities in Apache Storm

CVE-2021-40865 — Critical (CVSS 9.8): An Unsafe Deserialization vulnerability exists in the worker services of the Apache Storm supervisor server allowing…
CVE-2021-38294 — Critical (CVSS 9.8): A Command Injection vulnerability exists in the getTopologyHistory service of the Apache Storm 2.x prior to 2.2.1 and…
CVE-2018-11779 — Critical (CVSS 9.8): In Apache Storm versions 1.1.0 to 1.2.2, when the user is using the storm-kafka-client or storm-kafka modules, it is…
CVE-2015-3188 — Critical (CVSS 9.8): The UI daemon in Apache Storm 0.10.0 before 0.10.0-beta1 allows remote attackers to execute arbitrary code via…
CVE-2018-1331 — High (CVSS 8.8): In Apache Storm 0.10.0 through 0.10.2, 1.0.0 through 1.0.6, 1.1.0 through 1.1.2, and 1.2.0 through 1.2.1, an attacker…
CVE-2017-9799 — High (CVSS 8.8): It was found that under some situations and configurations of Apache Storm 1.x before 1.0.4 and 1.1.x before 1.1.1, it…

All CVEs affecting Apache Storm →

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
CVE-2026-20131 — Critical (CVSS 10.0): A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2026-25632 — Critical (CVSS 10.0): EPyT-Flow is a Python package designed for the easy generation of hydraulic and water quality scenario data of water…
CVE-2025-14931 — Critical (CVSS 10.0): Hugging Face smolagents Remote Python Executor Deserialization of Untrusted Data Remote Code Execution Vulnerability.…

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →