info leak uploading over WebSockets with GnuTLS
CVE-2026-107928 is fixed in 3 products on 1 platform, first by curl 8.18.0-1ubuntu2.8, released November 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.
When curl is built with GnuTLS, a malicious WebSocket server can make curl send memory past its send buffer. This is due to an out of bounds read following when `gnutls_record_send()` returns a number of bytes sent **greater than the number of bytes it was given to send**. GnuTLS does that after a blocked send.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.8 | curl 8.18.0-1ubuntu2.8 | Nov 7, 2026 |
| libcurl3t64-gnutls · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.8 | libcurl3t64-gnutls 8.18.0-1ubuntu2.8 | Nov 7, 2026 |
| libcurl4t64 · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.8 | libcurl4t64 8.18.0-1ubuntu2.8 | Nov 7, 2026 |
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