CVE-2026-35554

highpriority · track · 0EPSS 0.004 · 38 %ileDEEURUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.44% (38th) EPSS
CVSS 8.7 · high
Is it mine?
28 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

A race condition in the Apache Kafka Java producer client’s buffer pool management can cause messages to be silently delivered to incorrect topics. When a produce batch expires due to delivery.timeout.ms while a network request containing that batch is still in flight, the batch’s ByteBuffer is prematurely deallocated and returned to the buffer pool. If a subsequent producer batch—potentially destined for a different topic—reuses this freed buffer before the original network request completes, the buffer contents may become corrupted. This can result in messages being delivered to unintended topics without any error being reported to the producer. Data Confidentiality: Messages intended for one topic may be delivered to a different topic, potentially exposing sensitive data to consumers who have access to the destination topic but not the intended source topic. Data Integrity: Consumers on the receiving topic may encounter unexpected or incompatible messages, leading to deserialization failures, processing errors, and corrupted downstream data. This issue affects Apache Kafka versions ≤ 3.9.1, ≤ 4.0.1, and  ≤ 4.1.1. Kafka users are advised to upgrade to 3.9.2, 4.0.2, 4.1.2, 4.2.0, or later to address this vulnerability.

01

cvss

Technical severity, 0–10. One row per scoring source.

8.7
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.7highAV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU
v3.18.7highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Nsecondary · ENISA EU
v3.18.7highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Nsecondaryexploitability 2.2 · impact 5.8
v3.18.7highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Nsecondary · OSV
v3.18highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-362USCWE-362USCWE-362USCWE-416USCWE-416US
04

affected products (28)

Products and version ranges known to be affected.

showing 20 of 28
05

advisories (4)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-0996Apache Kafka: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2026-04-07csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Apache Kafka ausnutzen, um Informationen offenzulegen.

  • WID-SEC-W-2026-2260IBM Operational Decision Manager: Mehrere SchwachstellenDeutsch2026-07-08csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in IBM Operational Decision Manager ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, und um Sicherheitsvorkehrungen zu umgehen.

  • WID-SEC-W-2026-2460Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: Mehrere SchwachstellenDeutsch2026-07-21csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management ausnutzen, um beliebigen Code auszuführen, erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand auszulösen.

  • GHSA-5qcv-4rpc-jp93Apache Kafka Clients: Kafka Producer Message Corruption and Misrouting via Buffer Pool Race Condition2026-04-07ghsa · osvUS

    A race condition in the Apache Kafka Java producer client’s buffer pool management can cause messages to be silently delivered to incorrect topics. When a produce batch expires due to delivery.timeout.ms while a network request containing that batch is still in flight, the batch’s ByteBuffer is prematurely deallocated and returned to the buffer pool. If a subsequent producer batch—potentially destined for a different topic—reuses this freed buffer before the original network request completes, the buffer contents may become corrupted. This can result in messages being delivered to unintended topics without any error being reported to the producer. Data Confidentiality: Messages intended for one topic may be delivered to a different topic, potentially exposing sensitive data to consumers who have access to the destination topic but not the intended source topic. Data Integrity: Consumers on the receiving topic may encounter unexpected or incompatible messages, leading to deserialization failures, processing errors, and corrupted downstream data. This issue affects Apache Kafka versions ≤ 3.9.1, ≤ 4.0.1, and  ≤ 4.1.1. Kafka users are advised to upgrade to 3.9.2, 4.0.2, 4.1.2, 4.2.0, or later to address this vulnerability.

06

also known as (4)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundosvNVDCVE.orgMITRE
published 2026-04-07modified 2026-10-26
08

references (9)

External citations — patches, advisories, analysis.

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