CVE-2026-41608 Apache Thrift: Unbounded Zlib Decompression in Python THeaderTransport

High 7.5 Published 27 Jul 2026 Updated 28 Jul 2026

Attackers can cause denial of service in Apache Thrift Python applications by sending highly compressed data that triggers unbounded decompression.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-41608?

CVE-2026-41608 is a high-severity denial of service vulnerability in Apache Thrift, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Apache Thrift Python bindings.

This issue affects Apache Thrift: before 0.24.0.

Users are recommended to upgrade to version 0.24.0, which fixes the issue.

Weakness: CWE-409

Which versions are affected by CVE-2026-41608?

4 open source packages ship an affected version, including thrift. It affects 1 product.

Package	Affected	Fixed in
`thrift` Bitnami	All versions	`0.24.0`
`thrift` PyPI	All versions	`0.24.0`
`thrift` PyPI	All versions	`0.24.0`
`thrift` PyPI	All versions	`0.24.0`

Products include Apache Thrift.

How do I fix CVE-2026-41608?

Upgrade thrift to 0.24.0 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-41608 being exploited?

There is no known exploitation of CVE-2026-41608 in the wild and no public exploit code.

Sources

Also known as AZL-93989, BIT-thrift-2026-41608, DEBIAN-CVE-2026-41608, ECHO-3407-ba73-148e, GHSA-6pjx-3pjc-mrj8, MINI-594q-fhvc-3h8j and 3 more.