{"items":[{"id":"NVI-00016424","kind":"vulnerability","title":"Netty: TOCTOU in OcspServerCertificateValidator","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-wc96-39fc-566f","CVE-2026-56822"],"plain_summary":"GitHub lists this reviewed advisory for io.netty:netty-handler-ssl-ocsp, io.netty:netty-handler-ssl-ocsp. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-6df42ff11016d61ff87f80986480ed09"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-22T21:47:43.000Z","value":"7.4 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-6f869755e335e69b58da650380c000b8"},{"kind":"CVSS","as_of":"2026-08-07T15:05:31.170Z","value":"7.4 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-6df42ff11016d61ff87f80986480ed09"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-6f869755e335e69b58da650380c000b8","url":"https://github.com/advisories/GHSA-wc96-39fc-566f","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-wc96-39fc-566f","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:34:39.734Z"},{"id":"sr-6df42ff11016d61ff87f80986480ed09","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56822","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-56822","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T08:02:57.782Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-6f869755e335e69b58da650380c000b8"],"technology":"io.netty:netty-handler-ssl-ocsp","known_exclusions":[],"conditions_summary":"### Summary\nNetty's 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\n### Details\nIn `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`.\n\nBecause 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.\n\n### PoC\n\n```java\n    @Test\n    public void test() throws Exception {\n        EventLoopGroup group = new Mul","public_affected_ranges":[">= 4.2.0.Final, < 4.2.16.Final"]},{"certainty":"source_listed","source_ids":["sr-6f869755e335e69b58da650380c000b8"],"technology":"io.netty:netty-handler-ssl-ocsp","known_exclusions":[],"conditions_summary":"### Summary\nNetty's 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\n### Details\nIn `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`.\n\nBecause 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.\n\n### PoC\n\n```java\n    @Test\n    public void test() throws Exception {\n        EventLoopGroup group = new Mul","public_affected_ranges":["< 4.1.136.Final"]}],"null_published_at":"2026-11-08T19:53:48.745Z","source_updated_at":"2026-07-22T21:47:43.000Z","source_disclosed_at":"2026-07-22T21:47:41.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-03T22:34:39.734Z"},{"id":"NVI-00016424","kind":"vulnerability","title":"Netty: TOCTOU in OcspServerCertificateValidator","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-wc96-39fc-566f","CVE-2026-56822"],"plain_summary":"GitHub lists this reviewed advisory for io.netty:netty-handler-ssl-ocsp, io.netty:netty-handler-ssl-ocsp. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-6f869755e335e69b58da650380c000b8"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-22T21:47:43.000Z","value":"7.4 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-6f869755e335e69b58da650380c000b8"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-6f869755e335e69b58da650380c000b8","url":"https://github.com/advisories/GHSA-wc96-39fc-566f","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-wc96-39fc-566f","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:34:39.734Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-6f869755e335e69b58da650380c000b8"],"technology":"io.netty:netty-handler-ssl-ocsp","known_exclusions":[],"conditions_summary":"### Summary\nNetty's 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\n### Details\nIn `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`.\n\nBecause 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.\n\n### PoC\n\n```java\n    @Test\n    public void test() throws Exception {\n        EventLoopGroup group = new Mul","public_affected_ranges":[">= 4.2.0.Final, < 4.2.16.Final"]},{"certainty":"source_listed","source_ids":["sr-6f869755e335e69b58da650380c000b8"],"technology":"io.netty:netty-handler-ssl-ocsp","known_exclusions":[],"conditions_summary":"### Summary\nNetty's 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\n### Details\nIn `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`.\n\nBecause 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.\n\n### PoC\n\n```java\n    @Test\n    public void test() throws Exception {\n        EventLoopGroup group = new Mul","public_affected_ranges":["< 4.1.136.Final"]}],"null_published_at":"2026-11-04T10:04:27.943Z","source_updated_at":"2026-07-22T21:47:43.000Z","source_disclosed_at":"2026-07-22T21:47:41.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-03T22:34:39.734Z"}],"next_cursor":null,"snapshot_revision":"42594"}