CVE-2026-66858 Denial of service in Apache Thrift
Attackers can cause denial of service via stack exhaustion in multiple Apache Thrift language bindings by sending deeply nested unknown fields.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-66858?
CVE-2026-66858 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
The protocol skip routine in several Apache Thrift bindings did not apply the binding's recursion limit, so a message that nests unknown fields deeply enough can exhaust the stack. Affected: the Python C++ accelerator (the pure-Python protocols are not affected), the PHP library and its thrift_protocol extension, and the Perl, Lua, Smalltalk and OCaml libraries.
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-674
Which versions are affected by CVE-2026-66858?
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-2026-66858?
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-2026-66858 being exploited?
There is no known exploitation of CVE-2026-66858 in the wild and no public exploit code.
Sources
Also known as AZL-105950, BIT-thrift-2026-66858, DEBIAN-CVE-2026-66858, ECHO-daeb-c7a3-60a5, GHSA-hfqq-j57v-2292, MINI-pmgq-vfq4-4g83 and 1 more.