CVE-2026-66858

Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: skip() does not apply the recursion limit (Python accelerator, PHP, Perl, Lua, Smalltalk, OCaml)

State: Published
Severity: 8.7 High
Published: Oct 2, 2026
Updated: Oct 2, 2026
Reserved: Jul 27, 2026

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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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	apache

Weaknesses

CWE-674 Uncontrolled Recursion

Affected Products

Product	Versions
Apache ThriftApache Software Foundation	before 0.25.0Affected
Apache ThriftApache Software Foundation	before 0.25.0Affected
Apache ThriftApache Software Foundation	before 0.25.0Affected
Apache ThriftApache Software Foundation	before 0.25.0Affected
Apache ThriftApache Software Foundation	before 0.25.0Affected
Apache ThriftApache Software Foundation	before 0.25.0Affected

References

https://lists.apache.org/thread/33otcgbqd27wf6qq810q56znzbomnhg1vendor-advisory
https://lists.apache.org/thread/6kl6g40tpl8zt3opd8fwn6bsgyddzhd5vendor-advisory

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