# curl 8.13.0

- Product: curl (https://whatsnew.fyi/product/curl)
- Vendor: curl
- Date: 2025-04-02
- Version: 8.13.0
- Original notes: https://curl.se/ch/8.13.0.html
- Permalink: https://whatsnew.fyi/product/curl/releases/8.13.0
- Labels: Platforms: Desktop

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add write-out variable 'tls_earlydata'
- **added** — Make --url support a file with URLs
- **added** — Add CURLOPT_UPLOAD_FLAGS and --upload-flags for IMAP
- **added** — Add CURLFOLLOW_OBEYCODE and CURLFOLLOW_FIRSTONLY follow constants
- **added** — Add support for TLSv1.3 early data in OpenSSL and quictls
- **added** — Add support for CERTINFO in rustls
- **added** — Add support for SSLKEYLOGFILE in rustls
- **added** — Support ECH with DoH lookup for config in rustls
- **added** — Support native platform verifier in rustls
- **added** — Add a '64dec' function that can base64 decode a string
- **added** — Add TLS early data support for wolfssl
- **changed** — Set priority via --ciphers for gnutls
- **fixed** — Add curl macro to avoid redefining foreign symbols in addrinfo
- **fixed** — Avoid separate 'struct resdata' allocation in asyn-thread
- **fixed** — Avoid separate curl_mutex_t allocation in asyn-thread
- **fixed** — Do not allocate thread_data separately in asyn-thread
- **fixed** — Remove 'status' from struct Curl_async
- **fixed** — Fix dllmain.c in unity builds with autotools
- **fixed** — Fix connection reuse when SSL is optional

curl / Docs / Releases / Changes in 8.13.0
Related: Daily Snapshots Source repo Release log Pending Release
🠰 8.12.1 all changes 8.14.0 🠲
#### Changes in 8.13.0 - April 2 2025
8.13.0
8.13.0
Changes:
- curl: add write-out variable 'tls_earlydata'
- curl: make --url support a file with URLs
- gnutls: set priority via --ciphers
- IMAP: add CURLOPT_UPLOAD_FLAGS and --upload-flags
- lib: add CURLFOLLOW_OBEYCODE and CURLFOLLOW_FIRSTONLY
- OpenSSL/quictls: add support for TLSv1.3 early data
- rustls: add support for CERTINFO
- rustls: add support for SSLKEYLOGFILE
- rustls: support ECH w/ DoH lookup for config
- rustls: support native platform verifier
- var: add a '64dec' function that can base64 decode a string
- wolfssl: tls early data support
Bugfixes:
- addrinfo: add curl macro to avoid redefining foreign symbols
- asyn-thread: avoid the separate 'struct resdata' alloc
- asyn-thread: avoid the separate curl_mutex_t alloc
- asyn-thread: do not allocate thread_data separately
- asyn-thread: remove 'status' from struct Curl_async
- autotools: fix `dllmain.c` in unity builds
- autotools: fix `libtest` bundle to depend on `FIRSTFILES`
- autotools: use `CURLDEBUG` to exclude TrackMemory code from unity
- aws_sigv4: cannot be used for proxy
- aws_sigv4: merge repeated headers in canonical request
- aws_sigv4: use strparse more for parsing
- base64: drop `BUILDING_CURL` macro, always include in tests/server
- build: add Windows CE / CeGCC support, with CI jobs
- build: cmake multi-pkg-config detection improvements (brotli, ldap, mbedtls)
- build: do not apply curl debug macros to `tests/server` by default
- build: drop unused `getpart` tool
- build: enable -Wjump-misses-init for GCC 4.5+
- build: enable `-Wcast-qual`, fix or silence compiler warnings
- build: fix compiler warnings in feature detections
- build: replace Curl_ prefix with curlx_ for functions used in servers
- build: set `-O3` and tune WinCE in CI, fix `getpart`, `vtls_scache` fallouts
- build: set `HAVE_STDINT_H` if `stdint.h` is available
- build: set `HAVE_WRITABLE_ARGV` for Apple cross-builds
- build: silence bogus `-Wconversion` warnings with gcc 5.1-5.4
- build: silence mingw32ce C99 format warnings, simplify CI
- build: tidy-ups around `inet_pton`
- c-ares httpsrr: fix ifdef
- c-ares: error out for unsupported versions, drop unused macros
- ca-native.md: sync with CURLSSLOPT_NATIVE_CA
- cf-socket: deduplicate Windows Vista detection
- cf-socket: remove empty switch
- client writer: handle pause before decoding
- cmake: `CURL_LIBDIRS` improvements (upstreamed from vcpkg)
- cmake: `SHARE_LIB_OBJECT=ON` requires CMake 3.12 or newer
- cmake: add custom command scripts as dependencies where missing
- cmake: add pre-fill for Unix, enable in GHA/macos, verify pre-fills
- cmake: add shell completion support
- cmake: allow `CURL_STATIC_CRT` with shared libcurl and no curl exe
- cmake: allow `CURL_STATIC_CRT` with UCRT VS2015+ builds
- cmake: allow empty `IMPORT_LIB_SUFFIX`, add suffix collision detection
- cmake: avoid `-Wnonnull` warning in `HAVE_FSETXATTR_5` detection
- cmake: disable HTTPS-proxy as a feature if proxy is disabled
- cmake: drop `CURL_DISABLE_TESTS` option
- cmake: drop `HAVE_C_FLAG_Wno_long_double` logic for ancient Apple gcc
- cmake: drop `HAVE_IN_ADDR_T` from pre-fill too
- cmake: drop two stray TLS feature checks for wolfSSL
- cmake: exclude `-MP` for `clang-cl` again
- cmake: fix `HAVE_ATOMIC`/`HAVE_STDATOMIC` pre-fill for clang-cl
- cmake: fix clang-tidy builds to verify tests, fix fallouts
- cmake: fix detection pre-fills for iOS
- cmake: fix ECH detection in custom-patched OpenSSL
- cmake: fix typo in ECH config error msg
- cmake: hide empty `MINGW64_VERSION` output for mingw32ce
- cmake: improve httpd detection for pytest
- cmake: mention 'insecure' in the debug build warning
- cmake: misc tidy-ups
- cmake: pre-fill known type sizes for Windows OSes
- cmake: replace CMAKE_COMPILER_IS_GNUCC with CMAKE_C_COMPILER_ID
- cmake: replace exec_program()

_[Truncated at 4000 characters — full notes: https://curl.se/ch/8.13.0.html]_