En resumen
- CVE-2026-78659 es una vulnerabilidad ALTO (CVSS 7.5) que afecta a golang.org/x/net, stdlib.
- Probabilidad de explotación en los próximos 30 días (EPSS): 0.63%, mayor que el 50.1% de las vulnerabilidades.
- Solución: actualizar a 0.60.0, 1.27.2, 1.26.9 o posterior.
| Package | Affected versions | Patched versions |
|---|
| golang.org/x/net Go | < 0.60.0
| 0.60.0
|
| stdlib Go | ≥ 1.27.0-0, < 1.27.2< 1.26.9
| 1.27.21.26.9
|
Description
When "Trailer" headers are sent by a client, the HTTP server internally uses the header values to populate the Request.Trailer map passed to the server handler. Because Request.Trailer is a map, each entry incurs memory overhead. For HTTP/2 servers, a malicious client can exploit this by sending a "Trailer" header that declares a large number of fields, causing the server to allocate a disproportionate amount of memory while bypassing Server.MaxHeaderValueCount and Server.MaxHeaderBytes limits. This exploit is not applicable for HTTP/1 servers, which do not support multiplexing a large number of requests over one TCP connection, and whose Server.MaxHeaderBytes are calculated differently.
NVD description
When "Trailer" headers are sent by a client, the HTTP server internally uses the header values to populate the Request.Trailer map passed to the server handler. Because Request.Trailer is a map, each entry incurs memory overhead. For HTTP/2 servers, a malicious client can exploit this by sending a "Trailer" header that declares a large number of fields, causing the server to allocate a disproportionate amount of memory while bypassing Server.MaxHeaderValueCount and Server.MaxHeaderBytes limits. This exploit is not applicable for HTTP/1 servers, which do not support multiplexing a large number of requests over one TCP connection, and whose Server.MaxHeaderBytes are calculated differently.
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