CVE-2026-82435: Apache Storm Worker · Excessive Memory Allocation
Affects Apache Storm WorkerSource CVE Database V5
Not known to be exploited · CVSS 9.8 Critical : upgrade to 3.1.0 as a priority.
Data as of 29 Oct 2026, 19:04 UTC
- EPSS
- 0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 3.1.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 14 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade Apache to 3.1.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Apache Software FoundationApache Storm Worker | Affected
| Fixed in
|
MavenApache Software Foundation/org.apache.storm:storm-clientpkg:maven/Apache Software Foundation/org.apache.storm:storm-clientOther threats | Affected
| Fixed in
|
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AI-suggested
Upgrade Apache Storm Worker to version 3.1.0 or later, where the vulnerability is fixed by decoding frames only after handshake completion. For users unable to upgrade immediately, restrict worker slot port access to internal cluster networks only, as recommended by the security model. Additionally, enable `storm.messaging.netty.authentication` if the deployment environment permits, to enforce authentication before frame decoding.
Description
Description The worker's Netty message decoder is installed ahead of the SASL authentication handlers in the pipeline and acts on frames before any authentication has taken place. It allocated buffers sized from a length field carried in the frame, so a single frame from an unauthenticated peer able to reach a worker slot port could drive a large allocation. `storm.messaging.netty.authentication` defaults to false, and the decoder runs before the handler that enforces it in any case, so no credentials are required. The attacker needs only TCP reachability to a worker port. The effect of a single frame at the default 768 MB worker heap has not been measured to distinguish sustained worker loss from transient garbage-collection pressure. The severity assigned to this advisory reflects the more conservative reading; consumers who require a precise figure should test against their own worker heap configuration. Mitigation Upgrade to 3.1.0, where frames are decoded only after the handshake completes. Users who cannot upgrade immediately should ensure that worker slot ports are reachable only from within the cluster, as the security model already recommends, and should enable `storm.messaging.netty.authentication` where the deployment permits it. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.