Vulnerability in sse-channel (CVE-2026-44217)
Summary
Vulnerability in sse-channel (CVE-2026-44217). Risk of unauthorized operations or information disclosure. Exploitable via event. Mitigation: upgrade to 4.0.1 or later.
Original description
The description as published by the source.
sse-channel is an SSE-implementation which can be used to any node.js http request/response stream. Prior to 4.0.1, implementations that allow user-provided values to be passed to event, retry or id fields are susceptible to event spoofing, where an attacker could inject arbitrary messages into the stream. This vulnerability is fixed in 4.0.1.
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-2026-44217 has been found in sse-channel.
Attackers can target a specific entry point like event over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade sse-channel to 4.0.1 or later.
If unsure, ask your IT team or search "sse-channel CVE-2026-44217" on the vendor's site.
CVE-2026-44217 (sse-channel) — CWE-93
Attack surface: event / retry
Patched: 4.0.1 — apply immediately
Workaround: Do not allow user data to control event, retry or id fields, and if you must - sanitize the input before passing it to sse-channel, stripping any newlines.
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-93) exists in sse-channel. Attackers reach the vulnerable code path via event.
Check the vendor advisory for the affected versions of sse-channel. Attack surface: event / retry.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 4.0.1.
Workaround: Do not allow user data to control event, retry or id fields, and if you must - sanitize the input before passing it to sse-channel, stripping any newlines.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'sse-channel' . 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 'sse-channel' . | 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
sse-channelを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
Do not allow user data to control `event`, `retry` or `id` fields, and if you must - sanitize the input before passing it to `sse-channel`, stripping any newlines.パッチが適用されるまでの応急処置として、Do not allow user data to control
event,retryoridfields, and if you must - sanitize the input before passing it tosse-channel, stripping any newlines. を実施。回避策の副作用 (機能低下) を確認した上で。 -
3Apply patch patch
Upgrade sse-channel to 4.0.1ステージング環境で 4.0.1 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。
-
4Post-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
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- report github.com
- web github.com