CVE-2026-10142

kafka-python prior to 2.3.2 contains a denial-of-service vulnerability in the protocol parser that allows a malicious broker or machine-in-the-middle attacker to exhaust memory or hang connections by sending a crafted 4-byte frame length value without bounds validation. Attackers can send a specially crafted frame length through the receive_bytes() function to trigger either a multi-gigabyte memory allocation or an uncaught ValueError that leaves the connection in a broken state, causing requests to hang and consumers to stop heartbeating until restart.

Score

CVSS 4.0 8.7 High

Status

Analyzed - disclosure@vulncheck.com

Published

2026-06-10

Last modified

2026-10-08

Weaknesses

CWE-789

Affected products

• Kafka-python (Dpkp)

References

• https://www.vulncheck.com/advisories/kafka-python-prior-to-denial-of-service-via-protocol-parser-frame-length
• https://github.com/dpkp/kafka-python/pull/3019
• https://github.com/dpkp/kafka-python/pull/3026
• https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b