1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
<!--
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
-->
# Items to be removed from future curl releases
If any of these deprecated features is a cause for concern for you, please
email the
[curl-library mailing list](https://lists.haxx.se/listinfo/curl-library)
as soon as possible and explain to us why this is a problem for you and
how your use case cannot be satisfied properly using a workaround.
## c-ares 1.16.0
In March 2026, we drop support for all c-ares versions before 1.16.0.
## RTMP
RTMP in curl is powered by the 3rd party library librtmp.
- RTMP is barely used by curl users (2.2% in the 2025 survey)
- librtmp has no test cases, makes no proper releases and has not had a single
commit within the last year
- librtmp parses the URL itself and requires non-compliant URLs for this
- we have no RTMP tests
Support for RTMP in libcurl gets removed in April 2026.
## CMake 3.17 and earlier
We remove support for CMake <3.18 in April 2026.
CMake 3.18 was released on 2020-07-15.
## TLS-SRP Authentication
Transport Layer Security Secure Remote Password is a TLS feature that does not
work with TLS 1.3 or QUIC and is virtually unused by curl users and in
general.
TLS-SRP support gets removed in August 2026.
## SMB goes opt-in
The SMB protocol has weak security and is rarely used these days. After curl
8.19.0 SMB support becomes opt-in.
## NTLM goes opt-in
The NTLM authentication method has weak security and is rarely used these
days. It has been deprecated by Microsoft and does not work over HTTP/2 or
HTTP/3.
After curl 8.19.0 NTLM support becomes opt-in.
## Past removals
- axTLS (removed in 7.63.0)
- Pipelining (removed in 7.65.0)
- PolarSSL (removed in 7.69.0)
- NPN (removed in 7.86.0)
- Support for systems without 64-bit data types (removed in 8.0.0)
- NSS (removed in 8.3.0)
- gskit (removed in 8.3.0)
- MinGW v1 (removed in 8.4.0)
- NTLM_WB (removed in 8.8.0)
- space-separated `NOPROXY` patterns (removed in 8.9.0)
- hyper (removed in 8.12.0)
- Support for Visual Studio 2005 and older (removed in 8.13.0)
- Secure Transport (removed in 8.15.0)
- BearSSL (removed in 8.15.0)
- msh3 (removed in 8.16.0)
- winbuild build system (removed in 8.17.0)
- Windows CE (removed in 8.18.0)
- Support for Visual Studio 2008 (removed in 8.18.0)
- OpenSSL 1.1.1 and older (removed in 8.18.0)
- Support for Windows XP (removed in 8.19.0)
- OpenSSL-QUIC (removed in 8.19.0)
|
