EUVD-2026-36777
GHSA-g743-m6x3-v6wm
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable upload endpoint, single crafted POST with no auth or user interaction, impact limited to availability of the linx-server process.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
An issue in the uploadPostHandler component of Andrei Marcu linx-server v2.3.8 allows attackers to cause a Denial of Service (DoS) via a crafted POST request.
AnalysisAI
Denial of service in Andrei Marcu linx-server v2.3.8 allows remote unauthenticated attackers to crash or exhaust the file-upload service by sending a crafted POST request to the uploadPostHandler component. CVSS 3.1 rates availability impact High (7.5) with no confidentiality or integrity loss, and publicly available exploit code exists via a referenced GitHub gist, though there is no public exploit identified as actively exploited at time of analysis.
Technical ContextAI
linx-server is an open-source self-hosted file/URL/text sharing application written in Go by Andrei Marcu, originally developed to power the linx.li service. The vulnerable uploadPostHandler is the HTTP handler responsible for accepting multipart/form-data POST uploads. The root cause class is CWE-400 (Uncontrolled Resource Consumption), meaning the handler does not adequately bound the resources (memory, CPU, file descriptors, disk, or goroutines) consumed while parsing or persisting an incoming upload, so a maliciously shaped POST can drive the process into resource exhaustion. The CPE entry (cpe:2.3:a:n/a:n/a) was not populated by the reporter, but the description pins the affected build to linx-server v2.3.8.
RemediationAI
No vendor-released patch identified at time of analysis - neither the EUVD nor NVD references point to a fixed linx-server release, and the only references are the NVD entry (https://nvd.nist.gov/vuln/detail/CVE-2026-50879) and a POC gist (https://gist.github.com/pyuysig/807d92e6d8e7648d140d004f3b54b08b). Operators of linx-server v2.3.8 should monitor the upstream repository (github.com/andreimarcu/linx-server) for a release that hardens uploadPostHandler and upgrade as soon as it is published. In the interim, place linx-server behind a reverse proxy (nginx, Caddy, or Traefik) and enforce strict client_max_body_size / request body limits, per-IP connection and request-rate limits, and timeouts on slow POST bodies, accepting that legitimate large uploads will be rejected as a trade-off. Where public anonymous uploads are not required, restrict the upload endpoint to authenticated users or trusted source IPs via the proxy, and run the linx-server process with cgroup or systemd memory/CPU limits so a successful DoS attempt restarts the service rather than starving the host.
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
View allVendor StatusVendor
SUSE
Severity: ImportantShare
External POC / Exploit Code
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