CVE-2026-94638 Apache Thrift: PHP `thrift_protocol` C extension ignores the configured `maxStringSize`
Attackers can cause denial of service in Apache Thrift PHP applications by exploiting a missing limit on string size allocation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-94638?
CVE-2026-94638 is a medium-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 vulnerability in Apache Thrift PHP bindings.
This issue affects Apache Thrift: before 0.25.0.
Users are recommended to upgrade to version 0.25.0, which fixes the issue.
Weakness: CWE-770
Which versions are affected by CVE-2026-94638?
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-2026-94638?
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-2026-94638 being exploited?
There is no known exploitation of CVE-2026-94638 in the wild and no public exploit code.
Sources
Also known as AZL-106566, BIT-thrift-2026-94638, DEBIAN-CVE-2026-94638, ECHO-afb2-4c2a-858d, GHSA-v5qm-h2gw-6p8j, MINI-2g8h-wcmj-5w37 and 1 more.