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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Apache
  • Thrift
Redhat
  • Hummingbird

No data.

Package CPE Advisory Released Date
Red Hat Hardened Images
thrift-main-0.25.0-0.1.hum1 cpe:/a:redhat:hummingbird:1 RHSA-2026:74369 2026-10-01T00:00:00Z
References
Link Providers
https://lists.apache.org/thread/33otcgbqd27wf6qq810q56znzbomnhg1 cve-icon cve-icon cve-icon
https://lists.apache.org/thread/6kl6g40tpl8zt3opd8fwn6bsgyddzhd5 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-66858 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-66858 cve-icon
History

Sun, 04 Oct 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache thrift
Vendors & Products Apache
Apache thrift

Sat, 03 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-770
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important

Fri, 02 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 02 Oct 2026 12:45:00 +0000

Type Values Removed Values Added
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.
Title 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)
Weaknesses CWE-674
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}
cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published: 2026-10-02T12:27:31.412Z

Updated: 2026-10-02T16:54:25.933Z

Reserved: 2026-07-27T22:27:11.611Z

Link: CVE-2026-66858

cve-icon Vulnrichment

Updated: 2026-10-02T16:54:18.940Z

cve-icon NVD

Status : Deferred

Published: 2026-10-02T13:17:53.453

Modified: 2026-10-02T17:17:07.357

Link: CVE-2026-66858

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-02T12:27:31Z

Links: CVE-2026-66858 - Bugzilla