Apache Thrift: Resource exhaustion via Lua TBinaryProtocol readMessageBegin
Summary
Apache Thrift's Lua bindings contain a flaw in TBinaryProtocol:readMessageBegin, which can bypass the checkStringSize check on the pre-versioned message name. An attacker who can send crafted network input to a Lua-based Thrift service can exhaust resources and cause a denial of service. The CNA rates the impact as availability only, with no confidentiality or integrity impact.
Affected
- Apache Thrift Lua bindings before 0.25.0
- Other language bindings are not listed as affected by the CNA record.
Fixed in
- Apache Thrift 0.25.0 (released September 30, 2026)
- Fixed package versions for most distributions: Unknown.
Workaround
- No vendor workaround known.
- Until patched, restrict network access to Lua-based Thrift endpoints to known clients.
Exploitation
- No public exploit code confirmed at this time.
- Not listed in CISA KEV; no known exploitation in the wild.
- CISA SSVC: Exploitation none, automatable yes, technical impact partial.
- EPSS: 0.00426.
Our recommendation
- Check whether any Thrift service uses the Lua bindings, for example OpenResty or Lua services.
- Upgrade Apache Thrift to 0.25.0 or a fixed distribution package.
- Patch together with the related CVE-2026-94658 (Lua algorithmic complexity issue, also fixed in 0.25.0).
- Restrict network exposure of affected services until patched.
- Note: conflicting third-party reports describing RCE were not verified and are treated as errors.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Apache list thread 1 lists.apache.org
- Apache list thread 2 lists.apache.org
- OSV BIT-thrift-2026-94635 osv.dev
- Ubuntu security CVE-2026-94635 ubuntu.com
- Vulners CVE-2026-94635 vulners.com
- Linux Security news on Thrift 0.25.0 linuxsecurity.com
- Thrift changelog thrift.apache.org
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 06:08.
Original description (NVD)
Allocation of resources without limits or throttling, Improper handling of length parameter inconsistency vulnerability in Apache Thrift Lua bindings. This issue affects Apache Thrift: before 0.25.0. Users are recommended to upgrade to version 0.25.0, which fixes the issue.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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