Vulnerability in python-socketio (CVE-2026-48804)
Summary
Vulnerability in python-socketio (CVE-2026-48804). Risk of unauthorized operations or information disclosure. Exploitable via EVENT. Mitigation: upgrade to 5.16.2 or later.
Original description
The description as published by the source.
Impact
The python-socketio server stores binary EVENT and ACK messages in memory while it waits to receive their binary attachments. Once all the attachments are received, these messages are then processed. An attacker can submit a binary message and intentionally omit sending one or more of its attachments to cause the message along with the partial list of received attachments to stay in memory for a long time.
Patches
Version 5.16.2 takes the following measures to address this issue:
- Binary packets are only accepted from authenticated clients.
- When a client disconnects, the server checks if there is a partial binary message being held for the client and deletes it.
Source: GitHub Security Advisories (Global) 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-2026-48804 has been found in python-socketio.
Attackers can target a specific entry point like EVENT over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade python-socketio to 5.16.2 or later.
If unsure, ask your IT team or search "python-socketio CVE-2026-48804" on the vendor's site.
CVE-2026-48804 (python-socketio) — CWE-770 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: EVENT / ACK
Patched: 5.16.2 — 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-770) exists in python-socketio. Attackers reach the vulnerable code path via EVENT without authentication.
Check the vendor advisory for the affected versions of python-socketio. Attack surface: EVENT / ACK.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 5.16.2.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'python-socketio' . 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 'python-socketio' . | 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
python-socketioを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade python-socketio to 5.16.2ステージング環境で 5.16.2 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を含めること。
-
3Post-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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- package github.com
- web github.com
- web github.com
- web security-advisories@github.com