Vulnerability in github.com/luskaner/ageLANServer/server (CVE-2026-107839)
Summary
Vulnerability in github.com/luskaner/ageLANServer/server (CVE-2026-107839). Risk of unauthorized operations or information disclosure. Exploitable via POST /game/cloud/getFileURL. Mitigation: upgrade to 1.8.2-0.20260809203301-1dd40166a593 or later.
Original description
The description as published by the source.
Summary
The AoE3 POST /game/cloud/getFileURL handler in luskaner/ageLANServer's bundled game server decodes an attacker-controlled names JSON array and immediately allocates response storage sized directly from the array's length (make(i.A, len(req.Names.Data))), with no request body size limit and no cap on the number of array elements anywhere in the request path. Because the default configuration ships with Authentication = 'disabled', any network client can obtain a session through unauthenticated platform login and then send a single crafted request that forces the server to allocate memory proportional to attacker-chosen input. Dynamic testing against an unmodified build confirmed both large memory-amplification growth from a single request and a full server process kill via the kernel OOM killer when a memory-constrained instance received a few concurrent oversized requests. This is a high-severity, pre-authentication (self-registration only) remote denial-of-service vulnerability (CVSS 3.1 Base Score 7.5, CWE-400).
Details
server/internal/routes/game/cloud/getFileURL.go defines the request struct and handler for the AoE3 cloud "get file URL" endpoint:
type getFileURLRequest struct {
Names i.Json[[]string] `json:"names"`
}
func GetFileURL(w http.ResponseWriter, r *http.Request) {
var req getFileURLRequest
err := i.Bind(r, &req)
...
descriptions := make(i.A, len(req.Names.Data))
for j, name := range req.Names.Data {
...
Names i…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-107839 has been found in github.com/luskaner/ageLANServer/server.
Attackers can target a specific entry point like POST /game/cloud/getFileURL over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade github.com/luskaner/ageLANServer/server to 1.8.2-0.20260809203301-1dd40166a593 or later.
If unsure, ask your IT team or search "github.com/luskaner/ageLANServer/server CVE-2026-107839" on the vendor's site.
CVE-2026-107839 (github.com/luskaner/ageLANServer/server) — CWE-400 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: POST /game/cloud/getFileURL / POST /game/login/platformlogin / Host header / names
Patched: 1.8.2-0.20260809203301-1dd40166a593 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-400) exists in github.com/luskaner/ageLANServer/server. Attackers reach the vulnerable code path via POST /game/cloud/getFileURL without authentication.
Check the vendor advisory for the affected versions of github.com/luskaner/ageLANServer/server. Attack surface: POST /game/cloud/getFileURL / POST /game/login/platformlogin / Host header / names.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 1.8.2-0.20260809203301-1dd40166a593.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual POST /game/cloud/getFileURL requests with malformed payloads or SQL meta-characters. Run grep -r 'github.com/luskaner/ageLANServer/server' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'github.com/luskaner/ageLANServer/server' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
github.com/luskaner/ageLANServer/serverを grep し、稼働しているサービス・バージョンを把握する。 -
2Hunt for indicators of compromise detect
grep 'POST /game/cloud/getFileURL' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
POST /game/cloud/getFileURLへの異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Apply patch patch
Upgrade github.com/luskaner/ageLANServer/server to 1.8.2-0.20260809203301-1dd40166a593ステージング環境で 1.8.2-0.20260809203301-1dd40166a593 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 2 で見つけた異常検知の続報チェックを含めること。
-
4Post-deployment verification verify
Replay attack against POST /game/cloud/getFileURL on staging to confirm patch closes the vectorパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 2 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com