Enabling `CURLOPT_CRLF` causes curl to advertise the raw input byte count in the `IMAP APPEND {N}` literal while transmitting line-ending expanded data. The server reads only $N$ bytes for the payload, causing the remaining overflow bytes to be interpreted and executed as pipelined IMAP commands within the authenticated session.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Oct 19, 2026 | Oct 14, 2026 |
| Ubuntu | — | Upgrade curl (Ubuntu Pro)Upgrade libcurl4Upgrade libcurl3-nss (Ubuntu Pro)Upgrade libcurl4-gnutls-devUpgrade libcurl4-openssl-dev (Ubuntu Pro)Upgrade libcurl4-gnutls-dev (Ubuntu Pro)Upgrade libcurl3-gnutls (Ubuntu Pro)Upgrade libcurl4-nss-dev (Ubuntu Pro)Upgrade libcurl4-openssl-devUpgrade libcurl3 (Ubuntu Pro)Upgrade libcurl3t64-gnutlsUpgrade curlUpgrade libcurl3-gnutlsUpgrade libcurl4t64Upgrade libcurl3-nssUpgrade libcurl4-nss-devUpgrade libcurl4 (Ubuntu Pro) | Oct 14, 2026 | Oct 14, 2026 |
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