Apache Thrift: Stack-based buffer overflow in C++ THeaderProtocol
Summary
Apache Thrift's C++ THeaderProtocol contains a stack-based buffer overflow in writeVarint32(), caused by an incorrect bitwise shift. A remote attacker can trigger it by sending crafted THeader-framed input, which can crash the affected service (denial of service). Exposure is indirect: the risk applies to software that embeds the Thrift C++ library and processes such network input.
Affected
- Apache Thrift C++ (libthrift) versions before 0.25.0
- Software that bundles or links an affected libthrift version
Fixed in
- Apache Thrift 0.25.0
- Vendor or distribution builds that include the fix (for example openSUSE and Red Hat packages, per the sources)
Workaround
Unknown.
Exploitation
- No evidence of exploitation in the wild found.
- No public proof-of-concept code found.
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
- EPSS 0.0046 (low).
Our recommendation
- Check whether you run software that uses Apache Thrift C++ (libthrift), especially services that accept THeader-framed network input.
- Ask your software vendors for a version that includes the fix, or upgrade to Apache Thrift 0.25.0 or later where you build it yourself.
- Until patched, restrict network access to affected services.
- Monitor vendor advisories for products that bundle libthrift.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Apache Thrift mailing list thread (listed advisory, not verified) lists.apache.org
- Apache announce archive (CVE-2026-93925 announcement) www.mail-archive.com
- OpenCVE entry CVE-2026-93925 app.opencve.io
- Red Hat record RHSA-2026:74369 vulners.com
- NVD mirror on Vulners CVE-2026-93925 vulners.com
- Dependency scanner issue with conflicting CVSS 3 score 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, 06:06.
Original description (NVD)
Stack-based buffer overflow, Incorrect bitwise shift of integer vulnerability in Apache Thrift C++ THeaderProtocol. 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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