Exploit discussion active in current signal (1 latest mentions)
Recommended action window: High priority (within 72h)
NVD description
Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator forwards the SslHandshakeCompletionEvent before the asynchronous OCSP validation completes. This allows the client's downstream handlers to send sensitive application data (e.g., HTTP requests) to a revoked server before the channel is closed by the OCSP check. n io.netty.handler.ssl.ocsp.OcspServerCertificateValidator#userEventTriggered, when an SslHandshakeCompletionEvent is received, the validator immediately calls ctx.fireUserEventTriggered(evt). It then initiates an asynchronous OCSP query using OcspClient.query. Because the handshake completion event is forwarded immediately, downstream handlers in the client's pipeline are notified that the TLS handshake is successful. They may then begin reading and processing incoming application data or sending outgoing data. If the OCSP response later indicates the server's certificate is REVOKED, the validator closes the channel, but by this time, the client may have already leaked sensitive data to a revoked server or processed malicious responses from it. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.
Priority
MEDIUM
Exploitation
NONE
PoC
YES
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
| Date | Total | Labels |
|---|
| 2026-07-29 | 3 | Disclosure1Patch1PoC1 |
| 2026-07-31 | 1 | General1 |
Recent Netty vulnerabilities (CVE-2026-56822, CVE-2026-56210) highlight ongoing risks to data integrity in transit. Geopolitical tensions intensify the need for robust network security. #Cybersecurity #InfoSec #Geopolitics
Post summary
The post references two Netty CVEs but provides no technical, exploit, or mitigation information.
csirt_it: ‼ #Netty: disponibili #PoC per lo sfruttamento delle CVE-2026-56822 e CVE-2026-56821 Rischio: 🔴 Tipologia: 🔸 Security Feature Bypass 🔗 https://www.acn.gov.it/portale/w/netty-poc-pubbliche-per-lo-sfruttamento-delle-cve-2026-56822-e-cve-2026-56821 ⚠ Importante mantenere aggiornati i sistemi https://t.co/KinTpVuDUm
Post summary
The tweet announces public PoC for Netty CVEs 2026‑56822 and 2026‑56821, identifies them as security feature bypasses, and urges users to keep systems updated.
🚨*CVE* CVE-2026-56822 Netty is an asynchronous, event-driven network application framework. Prior to versions http://4.1.136.Final and http://4.2.16.Final, the OcspServerCertificateValidator forwards th… https://www.cve.org/CVERecord?id=CVE-2026-56822 ----- Traducció… http://infoflow.cloud`
Post summary
The tweet announces the existence of CVE-2026-56822 in Netty and directs readers to the CVE record, noting that versions prior to 4.1.136.Final and 4.2.16.Final contain the flaw.
CVE-2026-56822 Netty is an asynchronous, event-driven network application framework. Prior to versions http://4.1.136.Final and http://4.2.16.Final, the OcspServerCertificateValidator forwards th… https://www.cve.org/CVERecord?id=CVE-2026-56822
Post summary
The note references CVE-2026-56822 for Netty, indicating that the issue is fixed in versions 4.1.136.Final and 4.2.16.Final, but lacks detailed vulnerability or exploitation information.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | netty | netty | - | - | - |