Apache Thrift Java: Resource exhaustion in TSaslNonblockingServer
Summary
The Java implementation of Apache Thrift (libthrift) allocates memory for SASL frames without limit before a client authenticates. A remote, unauthenticated attacker can send crafted requests to exhaust memory and cause a denial of service on the affected Thrift server. Only Java services using TSaslNonblockingServer are affected, and the risk is highest for services reachable from the internet or untrusted networks.
Affected
- Apache Thrift Java bindings (org.apache.thrift:libthrift) before 0.25.0
- Java applications that use libthrift as a direct or transitive dependency, for example via jena-arq 5.5.0 (libthrift 0.22.0)
- Distribution packages: Unknown, check your distribution's security tracker
Fixed in
- Apache Thrift 0.25.0 (org.apache.thrift:libthrift:0.25.0)
- Distribution packages: Unknown, check your distribution's security tracker
Workaround
- No vendor workaround known.
- If patching is delayed, restrict network access to the Thrift service port to trusted sources only.
- Monitor memory usage and connection counts of affected Java services.
Exploitation
- Known exploited: No evidence found. Not listed as known exploited by a third-party tracker.
- Public proof of concept: None found in the sources reviewed.
- CISA SSVC: Exploitation none, automatable yes, technical impact partial.
Our recommendation
- Inventory Java services and check for libthrift versions below 0.25.0, including transitive dependencies in lockfiles and deployed JARs.
- Upgrade libthrift to 0.25.0 and check distribution packages separately.
- Prioritise any internet-reachable or untrusted-network Thrift Java service.
- Upgrading to 0.25.0 also addresses the related follow-up CVE-2026-94639.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Apache dev list announcement (Apache Thrift 0.25.0 fix) www.mail-archive.com
- Apache list thread 1 lists.apache.org
- Apache list thread 2 lists.apache.org
- OSV: Azure Linux advisory AZL-106605 osv.dev
- OSV: related follow-up BIT-thrift-2026-94639 osv.dev
- Ubuntu security tracker entry (OSV) osv.dev
- HAPI FHIR issue showing transitive libthrift dependency github.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, 05:58.
Original description (NVD)
Allocation of Resources Without Limits or Throttling vulnerability in Apache Thrift Java TSaslNonblockingServer. 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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