CVE-2026-35337: Deserialization of Untrusted Data vulnerability in Apache Storm. Versions Affected: before 2.8.6. Descripti

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HIGH 8.8WATCHLISTUPGRADE

CVE-2026-35337 is a high-severity flaw (CVSS 8.8) affecting storm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 t

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-04-13
Last modified	2026-10-26

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-13 10:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

apache storm UPGRADE

Affected: >= 2.0.0 and < 2.8.6

Fixed in: 2.8.6

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy storm || rpm -q storm || storm --version

2. UPGRADE to 2.8.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade storm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade storm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison storm sudo apt install storm=<VERSION_BEFORE_2.0.0> sudo apt-mark hold storm

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list storm sudo dnf downgrade storm-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add storm

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35337?

storm: upgrade to 2.8.6. Exact commands for each OS are on this page.

Is CVE-2026-35337 being exploited?

CVE-2026-35337 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35337 affect?

CVE-2026-35337 affects storm. Severity is high (CVSS 8.8). 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

How urgent is CVE-2026-35337?

Priority 52/100. High severity; On your watchlist

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References

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