Apache Thrift Dart bindings: Excessive memory allocation in TBinaryProtocol
Summary
The Dart bindings of Apache Thrift allocate memory based on a length value from the pre-versioned name in readMessageBegin of TBinaryProtocol, before the message is validated. A remote attacker who can send crafted Thrift messages to an affected Dart service can exhaust memory and cause a denial of service. Only applications using the Dart bindings are affected; the Java and C++ bindings are not.
Affected
- Apache Thrift versions before 0.25.0 that use the Dart bindings
- Java and C++ bindings are not affected
Fixed in
- Apache Thrift 0.25.0
- Fixed Dart package version: Unknown.
Workaround
Unknown. No vendor-documented workaround. Restrict network access to affected services until they are upgraded.
Exploitation
- No evidence of exploitation in the wild, public proof of concept or CISA KEV listing found at the time of research (KEV not queried directly).
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
- EPSS score 0.00426 (low).
Our recommendation
- Inventory Dart or Flutter applications and Thrift-based services.
- Identify the Thrift Dart package versions in use and upgrade to a release that includes Apache Thrift 0.25.0.
- Check whether affected services are reachable from the internet and restrict access where not needed.
- Upgrading also covers CVE-2026-94648 (Dart JSON protocol, also fixed in 0.25.0).
- Re-check NVD (status Deferred), CISA KEV and the Apache advisories for changes.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Apache mailing list thread 1 lists.apache.org
- Apache mailing list thread 2 lists.apache.org
- OSV: BIT-thrift-2026-94633 osv.dev
- Ubuntu security notice CVE-2026-94633 ubuntu.com
- OpenCVE CVE-2026-94633 app.opencve.io
- Vulners CVE-2026-94633 vulners.com
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, 06:04.
Original description (NVD)
Memory allocation with excessive size value, Improper handling of length parameter inconsistency vulnerability in Apache Thrift Dart 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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