IMAP APPEND plus CRLF conversion command injection
CVE-2026-87864 is fixed in 6 products on 1 platform, first by DEBIAN-CVE-2026-87864, released October 16, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Debian 14 | 8.22.0-1 | DEBIAN-CVE-2026-87864 | Oct 16, 2026 |
| curl · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm15 | curl 7.58.0-2ubuntu3.24+esm15 | Oct 21, 2026 |
| curl · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm10 | curl 7.68.0-1ubuntu2.25+esm10 | Oct 21, 2026 |
| curl · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.30 | curl 7.81.0-1ubuntu1.30 | Oct 21, 2026 |
| curl · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.16 | curl 8.5.0-2ubuntu10.16 | Oct 21, 2026 |
| curl · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.8 | curl 8.18.0-1ubuntu2.8 | Nov 7, 2026 |
| curl · sles 15.6 | 8.22.0-150600.4.58.1 | SUSE-SU-2026:5069-1 | Nov 7, 2026 |
| curl · sles 15.7 | 8.22.0-150700.7.33.1 | SUSE-SU-2026:5068-1 | Nov 7, 2026 |
| libcurl3-gnutls · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm15 | libcurl3-gnutls 7.58.0-2ubuntu3.24+esm15 | Oct 21, 2026 |
| libcurl3-gnutls · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm10 | libcurl3-gnutls 7.68.0-1ubuntu2.25+esm10 | Oct 21, 2026 |
| libcurl3-gnutls · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.30 | libcurl3-gnutls 7.81.0-1ubuntu1.30 | Oct 21, 2026 |
| libcurl3-nss · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm15 | libcurl3-nss 7.58.0-2ubuntu3.24+esm15 | Oct 21, 2026 |
| libcurl3-nss · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm10 | libcurl3-nss 7.68.0-1ubuntu2.25+esm10 | Oct 21, 2026 |
| libcurl3-nss · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.30 | libcurl3-nss 7.81.0-1ubuntu1.30 | Oct 21, 2026 |
| libcurl3t64-gnutls · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.16 | libcurl3t64-gnutls 8.5.0-2ubuntu10.16 | Oct 21, 2026 |
| libcurl3t64-gnutls · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.8 | libcurl3t64-gnutls 8.18.0-1ubuntu2.8 | Nov 7, 2026 |
| libcurl4 · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm15 | libcurl4 7.58.0-2ubuntu3.24+esm15 | Oct 21, 2026 |
| libcurl4 · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm10 | libcurl4 7.68.0-1ubuntu2.25+esm10 | Oct 21, 2026 |
| libcurl4 · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.30 | libcurl4 7.81.0-1ubuntu1.30 | Oct 21, 2026 |
| libcurl4t64 · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.16 | libcurl4t64 8.5.0-2ubuntu10.16 | Oct 21, 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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