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4.12.0

syslog-ng provides RPM and DEB package repositories for Ubuntu, Debian, and RHEL, for both amd64 and arm64 architectures.

We also provide ready-to-test binaries in Docker containers based on the current stable Debian image.

For more details, visit our Documentation Center

Highlights

  • parallelize(): Added batch-size() option

    batch-size() defines how many consecutive messages each input thread assigns to a single parallelize() worker.
    This preserves ordering for those messages on the output side and can also improve the performance of parallelize(). (#5654)

  • docker: Added an Alma Linux docker image with the RPM based installation of syslog-ng. See installation from Docker image for details. (#5705)

  • docker: Docker images are now rebuilt weekly to include the latest security patches from the base image. (#5665)

  • packaging: Added Ubuntu Resolute based install packages. See supported distributions for details. (#5695)

Features

  • afuser: add escaping() option to usertty() output

    The usertty() destination now supports an escaping() option, using the same template escaping behavior as templates. (#5713)

  • scl: make syslogconf awk converter installation optional

    Add build options for both CMake and autotools to optionally omit installation of scl/syslogconf/convert-syslogconf.awk.

    The converter remains installed by default, preserving existing behavior for current users. (#5702)

  • secure-logging: add configure switch and disable by default

    The secure logging (slog) module and its command line tools (slogkey, slogencrypt, slogverify) are now build-conditional and disabled by default. Enable them with the --enable-slog / --disable-slog autotools switches, or with -DENABLE_SLOG=ON / -DENABLE_SLOG=OFF when building with CMake. The official DEB and RPM packages no longer ship slog; it can be re-enabled by building with the sng-slog Debian build profile or with --with slog on RPM. (#5709)

  • journald-source: add read_old_on_error() option to control where to continue after a position restore attempt failure (#5648)

  • timeutils: accept "UTC" in date-parser()'s %z / %Z format strings. (#5637)

Bugfixes

  • CVE-2026-39879: fixed a possible SQL injection in syslog-ng SQL destionation driver

    Due to a missing sanitization call in afsql_dd_run_query, an SQL injection from an untrusted source might be possible. This is not part of the default configuration, the SQL driver has to be manually configured. (#5696)

  • afsql: fix segfault after database error (#5696)

  • java/hdfs: fix unreleased lock in send() when file open fails

    If getHdfsFile() returned null, the lock acquired at the start of send() was never released, causing a permanent deadlock on all subsequent calls. (#5707)

  • stats-aggregator: Fix use-after-free when an orphaned aggregator's timer fires after the aggregator is freed (#5712)

  • stats-exporter(): fixed the content-length value in the response header (#5662)

  • filter-blank: Fix race condition when evaluating from multiple threads

    The per-evaluation result was stored in a shared struct field, so concurrent worker threads could read each other's intermediate state, causing blank()/not blank() to return incorrect results. (#5700)

  • correlation: fix radix parser end-of-input handling

    Fixes two related radix matcher edge cases at end of input.

    Parser scans now stop before '\0' to avoid reading past end-of-input and to keep captured lengths correct. Parser-node traversal now continues with empty remaining input, so OPTIONALSET children can still match. (#5690)

  • ivykis: frequent SIGABRT on FreeBSD

    Fixed a FreeBSD-specific issue in our ivykys internal fork. (#5690)

    NOTE: the fix has not yet been merged into the upstream ivykis repository, so it is currently available only in builds using the syslog-ng internal ivykis fork (--with-ivykis=internal or -DIVYKIS_SOURCE=internal). This includes our official DEB and RPM packages, as well as Docker images. If you are building syslog-ng from source with an external ivykis library, you will need to apply the patch manually until it is merged upstream.

  • pdbtool: use fixed ISO-8601 timestamp format in patternize progress messages

    Patternize progress lines now use YYYY-MM-DDTHH:MM:SS.UUUUUU formatting instead of ctime() output, making them consistent with other syslog-ng message timestamps. This also avoids relying on ctime() in this path, reducing possible multithreading issues. (#5697)

  • cfg, tls: respect perm() when writing security-sensitive files

    The --preprocess-into config dump and the tls(keylog-file()) output are now created via a new file_perm_options_fopen() helper that honours the global perm()/owner()/group() options with a 0600 floor. Previously both files inherited the process umask (typically 0644); depending on the enclosing directory's permissions, this could leave config secrets and TLS session keys readable to other local users on the host.

    Note for admins: the helper opens these two files with O_NOFOLLOW, so if the target path is a symlink at the final component the open will now fail with ELOOP instead of writing through the link. Replace any such symlinks with the real destination path. (#5701)

  • secure-logging: new implementation of the pseudo-random function

    The previous implementation allowed an attacker to distinguish between the pseudo-random function (PRF) and a real random function by supplying specially crafted inputs to it. This leads to a predictable way of how the PRF is generating output which should not by allowed by a good PRF. The new implementation provides a variable input length and constant output length PRF based on AES CMAC for key derivation using the current key Ki, i.e. a key expansion of Ki using multiple iterations is performed. (#5614)

  • http: fixed a crash when syslog-ng built with http compression disabled (#5648)

  • cfg-parser: let the user adjust the parser stack size (#5639)

  • tls-verifier: fix leak in tls_verify_certificate_name (#5635)

  • tls-verifier: fix leak in tls_wildcard_match (#5630)

  • afsql: fix missing break in LM_VT_BOOLEAN case causing fallthrough to LM_VT_NULL (#5626)

  • tls: add NULL check after SSL_new() in tls_context_setup_session (#5621)

Notes to developers

  • debun: fix possible hung issues related to syslog-ng-ctl (#5680)
  • tests: all remained old style functional tests are converted to light functional tests, the old style functional test folder is removed completely (#5673)
  • grpc: the minimum required C++ standard is now C++20 on some platforms, so the configuration flows trying to detect and use C++20 support. If C++20 is not available, the build will fall back to C++17 as before, but the build can fail depending on the platform and compiler versions. (#5711)
  • criterion: fixed criterion tests on macOS, do not use ParameterizedTests on that platform due to a known issue with the test framework. (#5689)

Other changes

  • stats-exporter(): applied changes arte:

    • any internal request or response processing errors which cannot be responded with a valid HTTP response, will now log the error and close the connection
    • the SCL module single-instance() option is synced correctly with the stats-exporter module's single-instance() option, so the default value must be yes in every case
    • the response content-type is set according to the requested stat-format()
    • added an internal chunked response solution, so large responses should not cause stalls anymore
    • set the default scrape-freq-limit() to 15

    (#5662)

Credits

syslog-ng is developed as a community project, and as such it relies on volunteers, to do the work necessarily to produce syslog-ng.

Reporting bugs, testing changes, writing code or simply providing feedback are all important contributions, so please if you are a user of syslog-ng, contribute.

We would like to thank the following people for their contribution:

Airbus Commercial Aircraft, Hofi, Bálint Horváth, Kevin Mainardis, OvO, Tamas Pal, Romain Tartière, Alex Tristor, László Várady, Alexander Yurkov, Akos Zalavary