CVE-2026-94636 Apache Thrift: Python `TZlibTransport` stops enforcing its decompressed-size limit once the limit is exactly used up
Attackers can cause denial of service in Apache Thrift Python applications by exploiting a flaw in TZlibTransport decompression limits.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-94636?
CVE-2026-94636 is a high-severity denial of service vulnerability in Apache Thrift, published on 2 Oct 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), Function call with incorrectly specified arguments, Improper validation of specified quantity in input vulnerability in Apache Thrift py bindings.
This issue affects Apache Thrift: before 0.25.0.
Users are recommended to upgrade to version 0.25.0, which fixes the issue.
Which versions are affected by CVE-2026-94636?
1 open source package ship an affected version, including thrift.
| Package | Affected | Fixed in |
|---|---|---|
thrift Bitnami | All versions | 0.25.0 |
How do I fix CVE-2026-94636?
Upgrade thrift to 0.25.0 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-2026-94636 being exploited?
There is no known exploitation of CVE-2026-94636 in the wild and no public exploit code.
Sources
Also known as AZL-105410, BIT-thrift-2026-94636, DEBIAN-CVE-2026-94636, ECHO-218a-790f-6ea4, GHSA-25j2-4rc9-8hj6, MINI-8wr7-2p6f-8rww and 1 more.