CVE-2026-65370 in servicetalk
Summary
by MITRE • 08/12/2026
ServiceTalk HTTP/1.x incorrectly handles malformed Transfer-Encoding which could result in request smuggling attacks. This vulnerability is addressed in servicetalk version 0.42.65.
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Analysis
by VulDB Data Team • 08/12/2026
The vulnerability in ServiceTalk HTTP/1.x represents a critical security flaw that arises from improper handling of malformed Transfer-Encoding headers during HTTP request processing. This issue stems from the protocol's failure to correctly validate and parse transfer encoding specifications, creating opportunities for attackers to manipulate request boundaries and potentially execute request smuggling attacks. The root cause lies in the software's insufficient input validation mechanisms that should normally enforce strict adherence to HTTP/1.1 specification requirements for transfer encoding handling.
The technical implementation flaw manifests when ServiceTalk encounters malformed Transfer-Encoding headers that do not conform to standard HTTP specifications. This misconfiguration allows attackers to craft requests where the server interprets different portions of a single HTTP message as separate requests, effectively creating a situation where multiple requests can be processed simultaneously or in unexpected sequences. The vulnerability specifically affects HTTP/1.x implementations and does not extend to HTTP/2 or other protocol versions that handle transfer encoding differently.
Operationally this vulnerability presents significant risks to web applications and services relying on ServiceTalk for HTTP processing. Request smuggling attacks enabled by this flaw could allow adversaries to bypass security controls, access restricted resources, manipulate request routing, or potentially inject malicious content into server responses. The impact extends beyond simple data exposure as attackers could exploit the inconsistency in how malformed transfer encodings are processed to perform more sophisticated attacks such as cache poisoning or session manipulation. Organizations using affected versions face potential unauthorized access and data compromise risks.
The mitigation strategy involves upgrading to ServiceTalk version 0.42.65, which includes proper validation mechanisms for Transfer-Encoding headers. Security teams should also implement additional monitoring for unusual HTTP request patterns and consider deploying web application firewalls that can detect and block malformed transfer encoding attempts. Organizations should conduct thorough testing of the updated version to ensure no regression issues affect existing functionality while implementing proper input sanitization measures at multiple layers of their infrastructure. This vulnerability aligns with CWE-444 which addresses improper handling of HTTP requests and relates to ATT&CK technique T1213 for data from information repositories, specifically focusing on web application attack vectors where malformed request handling creates exploitable conditions.