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CVE-2026-26986
Use-After-Free in CVE-2026-26986 (CVE-2026-26986)
Summary
vulnerability in CVE-2026-26986 (CVE-2026-26986). Risk of unauthorized operations or information disclosure. Exploitable via ``rail_window_free``.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-26986** has been found in CVE-2026-26986.
Attackers can target a specific entry point like ``rail_window_free`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "CVE-2026-26986 CVE-2026-26986" on the vendor's site.
CVE-2026-26986 (CVE-2026-26986) — CWE-416 /
Attack surface: `rail_window_free` / `xfAppWindow` / `HashTable_Free` / `xf_rail_window_common`
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.
❓ What is the problem
**use-after-free** (CWE-416) exists in CVE-2026-26986. Attackers reach the vulnerable code path via ``rail_window_free`` without authentication.
📍 Affected scope
CVE-2026-26986 — . Attack surface: `rail_window_free` / `xfAppWindow` / `HashTable_Free` / `xf_rail_window_common`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.依存マニフェストで影響コンポーネントを特定する。
-
7Post-deployment verification verify
Confirm patched version is live in production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 3 と同じログクエリでアラート再発が無いか継続監視。
References
- advisory https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26986.json
- advisory https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-crqx-g6x5-rx47
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-26986
- patch https://github.com/FreeRDP/FreeRDP/commit/b4f0f0a18fe53aa8d47d062f91471f4e9c5e0d51
- web https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1230-L1238
- web https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1297
- web https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1316-L1327
- web https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L386-L394
- web https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L395-L399
- web https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L401-L404