File disclosure and header injection via validation gaps
Published May 5, 2026 · Updated May 5, 2026
Path traversal and response splitting in Apache Thrift's web_server.js before 0.23.0 allow remote attackers to read files and inject headers. The server accepted paths sharing only the static-root prefix, reflected unsanitized Origin, Host, and URL values, skipped CORS checks during WebSocket upgrades, and allocated frame buffers with an unsafe constructor. Exposure requires an application to use createWebServer; crafted HTTP or WebSocket requests can escape the static root, alter responses, bypass configured origin restrictions, or expose stale buffer data.
Summary
What happened
Path traversal and response splitting in Apache Thrift's web_server.js before 0.23.0 allow remote attackers to read files and inject headers. The server accepted paths sharing only the static-root prefix, reflected unsanitized Origin, Host, and URL values, skipped CORS checks during WebSocket upgrades, and allocated frame buffers with an unsafe constructor. Exposure requires an application to use createWebServer; crafted HTTP or WebSocket requests can escape the static root, alter responses, bypass configured origin restrictions, or expose stale buffer data.
The record
- CVE
- CVE-2026-43870
- Published
- May 5, 2026
- Updated
- May 5, 2026
- Vendor
- The Apache Software Foundation
- Product
- Apache Thrift
- Classifications
- CWE-113, CWE-22, CWE-400, CWE-346, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 5, 2026CVE publishedPublication date reported by the CVE source.
- May 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <0.23.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo