CVE-2026-94634 Apache Thrift: Python `TJSONProtocol` has a string length limit that is off by default
An attacker can cause denial of service in Apache Thrift Python applications due to an insecure default string length limit in TJSONProtocol.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-94634?
CVE-2026-94634 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
Allocation of resources without limits or throttling, Initialization of a resource with an insecure default vulnerability in Apache Thrift Python 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-2026-94634?
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-2026-94634?
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-2026-94634 being exploited?
There is no known exploitation of CVE-2026-94634 in the wild and no public exploit code.
Sources
Also known as AZL-105431, BIT-thrift-2026-94634, DEBIAN-CVE-2026-94634, ECHO-e672-55e9-2902, GHSA-2gpw-mvhv-qq99, MINI-vfpj-2c3f-985r and 1 more.