Apache Thrift is a widely used backend RPC library; this high-severity RCE can disrupt services and is relevant across many tech stacks.
CVE-2026-91135
Heap overflow in Apache Thrift C++ enabling remote code execution via crafted compressed frames
Is CVE-2026-91135 being exploited?
Not confirmed. CVE-2026-91135 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.
How severe is CVE-2026-91135?
CVE-2026-91135 is rated Critical with a CVSS score of 9.2. 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-2026-91135?
Yes. A fix has been recorded for CVE-2026-91135. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-91135 affect?
CVE-2026-91135 affects Apache Thrift (C++) < 0.25.0, Applications using THeaderTransport with ZLIB transform. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-91135?
Upgrade Thrift C++ to >=0.25.0 immediately; block untrusted Thrift traffic
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution or denial of service via malicious ZLIB-compressed Thrift frames causing heap OOB read/write
Immediate action required
- affected< 0.25.0
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.