Apache Thrift is a widely used RPC library; heap overflow in C++ bindings can enable RCE across services and infrastructure, requiring org-wide attention and patching.
CVE-2026-55971
Heap overflow in Apache Thrift C++ (<0.24.0) may allow remote code execution.
Is CVE-2026-55971 being exploited?
Not confirmed. CVE-2026-55971 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-55971?
CVE-2026-55971 is rated Critical. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-55971?
Yes. A fix has been recorded for CVE-2026-55971. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55971 affect?
CVE-2026-55971 affects Apache Thrift C++ (before 0.24.0), Applications using Thrift C++ bindings, Microservices/RPC servers built on Thrift C++. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55971?
Upgrade Apache Thrift to 0.24.0 immediately; prioritize exposed services.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Heap-based buffer overflow in Thrift C++ bindings can allow remote code execution or crash via crafted RPC/deserialization input.
Immediate action required
- affected< 0.24.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.