What is CVE-2026-43870?

CVE-2026-43870 is a high-severity vulnerability in Apache Thrift, classified under Path Traversal. CVSS score: 7.3/10. Published 2026-05-05.

How severe is CVE-2026-43870?

High severity. CVSS v3 base score is 7.3 out of 10.

Path Traversal in Apache Thrift

CVE-2026-43870

Origin Validation Error, Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting'), Uncontrolled Resource Consumption vulnerability in Apache Thrift. This issue affects Apache Thrift: before 0.23.0. Users are recommended to upgrade to version 0.23.0, which fixes the issue.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-05-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (29.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Apache Thrift
Apache Software Foundation Thrift — versions 0

Weakness classification (CWE)

References

lists.apache.org/thread/pgtfq44ltc9t63kxcbqmwqzt45pnhqdy (vendor-advisory, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-43870?: CVE-2026-43870 is a high-severity vulnerability in Apache Thrift, classified under Path Traversal. CVSS score: 7.3/10. Published 2026-05-05.
How severe is CVE-2026-43870?: High severity. CVSS v3 base score is 7.3 out of 10.