CVE-2026-40516 | HKUDS OpenHarness HTTP Service web_fetch/web_search server-side request forgery (EUVD-2026-23452)

VDB-358087 · CVE-2026-40516 · EUVD-2026-23452 HKUDS OPENHARNESS HTTP SERVICE WEB_FETCH/WEB_SEARCH SERVER-SIDE REQUEST FORGERY HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.6 $0-$5k 6.15+ Summaryinfo A vulnerability identified as critical has been detected in HKUDS OpenHarness. This issue affects the function web_fetch/web_search of the component HTTP Service. This manipulation causes server-side request forgery. This vulnerability is tracked as CVE-2026-40516. The attack is possible to be carried out remotely. No exploit exists. It is recommended to apply a patch to fix this issue. Detailsinfo A vulnerability has been found in HKUDS OpenHarness (affected version not known) and classified as critical. Affected by this vulnerability is the function web_fetch/web_search of the component HTTP Service. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: OpenHarness before commit bd4df81 contains a server-side request forgery vulnerability in the web_fetch and web_search tools that allows attackers to access private and localhost HTTP services by manipulating tool parameters without proper validation of target addresses. Attackers can influence an agent session to invoke these tools against loopback, RFC1918, link-local, or other non-public addresses to read response bodies from local development services, cloud metadata endpoints, admin panels, or other private HTTP services reachable from the victim host. The weakness was disclosed by Chia Min Jun Lennon. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-40516 since 04/13/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. Applying the patch bd4df81f634f8c7cddcc3fdf7f561a13dcbf03ae is able to eliminate this problem. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-23452). Productinfo Vendor HKUDS Name OpenHarness Website Product: https://github.com/HKUDS/OpenHarness/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 7.8 VulDB Meta Temp Score: 7.6 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.3 CNA Vector (VulnCheck): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Server-side request forgery CWE: CWE-918 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Patch Status: 🔍 0-Day Time: 🔒 Patch: bd4df81f634f8c7cddcc3fdf7f561a13dcbf03ae Timelineinfo 04/13/2026 CVE reserved 04/17/2026 +4 days Advisory disclosed 04/17/2026 +0 days VulDB entry created 04/17/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Researcher: Chia Min Jun Lennon Status: Confirmed CVE: CVE-2026-40516 (🔒) GCVE (CVE): GCVE-0-2026-40516 GCVE (VulDB): GCVE-100-358087 EUVD: 🔒 Entryinfo Created: 04/17/2026 18:47 Updated: 04/17/2026 19:16 Changes: 04/17/2026 18:47 (77), 04/17/2026 19:16 (1) Complete: 🔍 Cache ID: 99:7E2:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸