FreeBSD source tree https://cgit-dev.freebsd.org/src/atom?h=main 2026-07-09T17:17:11Z 2026-07-09T17:17:11Z Ed Maste emaste@FreeBSD.org 2026-07-09T17:17:11Z urn:sha1:bb5c77e9d281d6def6835d48249898764bc6a5fe Full release notes are available at https://www.openssh.com/txt/release-10.4 Selected highlights from the release notes: Potentially-incompatible changes -------------------------------- * sshd(8): configuration dump mode ("sshd -G") now writes directives in mixed case (e.g. "PubkeyAuthentication") whereas previously it emitted only lower-case names. * ssh(1), sshd(8): make the transport protocol stricter by disconnecting if the peer sends non-KEX messages during a post- authentication key re-exchange. Previously a malicious peer could continue sending non-key exchange messages without penalty. These would be buffered, causing memory to be wasted up until the connection terminated or the server/client hit a memory limit. Implementations that do not restrict messages sent during key exchange as per RFC4253 section 7.1 may be disconnected. Reported by Marko Jevtic. Changes since OpenSSH 10.3 ========================== This release contains a number of security fixes as well as general bugfixes and a couple of new features. Security ======== * sftp(1): when downloading files on the command-line using "sftp host:/path .", a malicious server could cause the file to be downloaded to an unexpected location. This issue was identified by the Swival Security Scanner. * scp(1): when copying files between two remote destinations, do not allow a malicious server to write files to the parent directory of the intended target directory. This issue was identified by the Swival Security Scanner. * sshd(8): DisableForwarding=yes didn't override PermitTunnel=yes as it was documented to do. Note that PermitTunnel is not enabled by default. Reported independently by Huzaifa Sidhpurwala of Redhat and Marko Jevtic. * sshd(8): avoid a potential pre-authentication denial of service when GSSAPIAuthentication was enabled (this feature is off by default). This was not mitigated by MaxAuthTries, but would be penalised by PerSourcePenalties. This was reported by Manfred Kaiser of the milCERT AT (Austrian Ministry of Defence). * sshd(8): fix a number of cases where the minimum authentication delay was not being enforced. Reported by the Orange Cyberdefense Vulnerability Team. * ssh(1): fix a possible client-side use-after-free if the server changes its host key during a key reexchange. This was reported by Zhenpeng (Leo) Lin of Depthfirst. New features ------------ * All: add experimental support for a composite post-quantum signature scheme that combines ML-DSA 44 and Ed25519 as specified in draft-miller-sshm-mldsa44-ed25519-composite-sigs. This scheme is not enabled by default. To use it, you'll need to add it to HostKeyAlgorithms, PubkeyAcceptedAlgorithms, etc. Keys may be generated using "ssh-keygen -t mldsa44-ed25519". Bugfixes -------- * sshd(8): avoid sending observably different messages for valid vs invalid users in GSSAPIAuthentication (disabled by default). * ssh(1), sshd(8): fix several bugs that incorrectly classified bulk traffic as interactive. bz3972, bz3958 * ssh-keygen(1), ssh-add(1): skip unsupported key types when downloading resident keys from a FIDO token. Previously, downloads would abort when one was encountered. GHPR657 Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D58083 2026-05-14T18:59:30Z Ed Maste emaste@FreeBSD.org 2026-05-14T18:59:30Z urn:sha1:2574974648c68c738aec3ff96644d888d7913a37 Full release notes are available at https://www.openssh.com/txt/release-10.3 Selected highlights from the release notes: * ssh(1), sshd(8): remove bug compatibility for implementations that don't support rekeying. If such an implementation tries to interoperate with OpenSSH, it will now eventually fail when the transport needs rekeying. * ssh(1), sshd(8): support IANA-assigned codepoints for SSH agent forwarding, as per draft-ietf-sshm-ssh-agent. Support for the new names is advertised via the EXT_INFO message. If a server offers support for the new names, then they are used preferentially. * ssh(1): add a ~I escape option that shows information about the current SSH connection. * sshd(8): add 'invaliduser' penalty to PerSourcePenalties, which is applied to login attempts for usernames that do not match real accounts. Defaults to 5s to match 'authfail' but allows administrators to block such attempts for longer if desired. * Support the ed25519 signature scheme via libcrypto. Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D56999 2026-05-12T20:24:10Z Ed Maste emaste@FreeBSD.org 2026-05-12T20:24:10Z urn:sha1:644b4646c7acab87dc20d4e5dd53d2d9da152989 Full release notes are available at https://www.openssh.com/txt/release-10.1 Selected highlights from the release notes: Potentially-incompatible changes * ssh(1): add a warning when the connection negotiates a non-post quantum key agreement algorithm. * ssh(1), sshd(8): major changes to handling of DSCP marking/IPQoS * ssh(1), sshd(8): deprecate support for IPv4 type-of-service (ToS) keywords in the IPQoS configuration directive. * ssh-add(1): when adding certificates to an agent, set the expiry to the certificate expiry time plus a short (5 min) grace period. * ssh-agent(1), sshd(8): move agent listener sockets from /tmp to under ~/.ssh/agent for both ssh-agent(1) and forwarded sockets in sshd(8). Security * ssh(1): disallow control characters in usernames passed via the commandline or expanded using %-sequences from the configuration file, and disallow \0 characters in ssh:// URIs. New features * ssh(1), sshd(8): add SIGINFO handlers to log active channel and session information. Sponsored by: The FreeBSD Foundation 2025-09-29T16:32:36Z Jose Luis Duran jlduran@FreeBSD.org 2025-09-29T16:32:36Z urn:sha1:e02003bce726333872d65b7b9a1557d97b6d91a0 Use NetBSD probe locations for consistency. We have submitted all improved or missing probes, keeping them synchronized with NetBSD (our blocklist upstream) should simplify upgrades and maintenance, as the locations of these probes are a moving target, depending on upstream OpenSSH changes. Additionally, use BLACKLIST_AUTH_FAIL exclusively for now. At the time of this commit BLACKLIST_BAD_USER, is a no-op. However, it will change in a future upgrade. Also, enhance blacklist notification messages for better debugging by making them more descriptive. Reviewed by: emaste Approved by: emaste (mentor) MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D52749 2025-02-19T19:08:59Z Ed Maste emaste@FreeBSD.org 2025-02-19T19:08:59Z urn:sha1:3d9fd9fcb432750f3716b28f6ccb0104cd9d351a Highlights from the release notes are reproduced below. Bug fixes and improvements that were previously merged into FreeBSD have been elided. See the upstream release notes for full details of the 9.9p1 release (https://www.openssh.com/releasenotes.html). --- Future deprecation notice ========================= OpenSSH plans to remove support for the DSA signature algorithm in early 2025. Potentially-incompatible changes -------------------------------- * ssh(1): remove support for pre-authentication compression. * ssh(1), sshd(8): processing of the arguments to the "Match" configuration directive now follows more shell-like rules for quoted strings, including allowing nested quotes and \-escaped characters. New features ------------ * ssh(1), sshd(8): add support for a new hybrid post-quantum key exchange based on the FIPS 203 Module-Lattice Key Enapsulation mechanism (ML-KEM) combined with X25519 ECDH as described by https://datatracker.ietf.org/doc/html/draft-kampanakis-curdle-ssh-pq-ke-03 This algorithm "mlkem768x25519-sha256" is available by default. * ssh(1), sshd(8), ssh-agent(1): prevent private keys from being included in core dump files for most of their lifespans. This is in addition to pre-existing controls in ssh-agent(1) and sshd(8) that prevented coredumps. This feature is supported on OpenBSD, Linux and FreeBSD. * All: convert key handling to use the libcrypto EVP_PKEY API, with the exception of DSA. Bugfixes -------- * sshd(8): do not apply authorized_keys options when signature verification fails. Prevents more restrictive key options being incorrectly applied to subsequent keys in authorized_keys. bz3733 * ssh-keygen(1): include pathname in some of ssh-keygen's passphrase prompts. Helps the user know what's going on when ssh-keygen is invoked via other tools. Requested in GHPR503 * ssh(1), ssh-add(1): make parsing user@host consistently look for the last '@' in the string rather than the first. This makes it possible to more consistently use usernames that contain '@' characters. * ssh(1), sshd(8): be more strict in parsing key type names. Only allow short names (e.g "rsa") in user-interface code and require full SSH protocol names (e.g. "ssh-rsa") everywhere else. bz3725 * ssh-keygen(1): clarify that ed25519 is the default key type generated and clarify that rsa-sha2-512 is the default signature scheme when RSA is in use. GHPR505 --- Reviewed by: jlduran (build infrastructure) Reviewed by: cy (build infrastructure) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D48947 2025-02-19T17:20:44Z Ed Maste emaste@FreeBSD.org 2025-02-19T17:20:44Z urn:sha1:0fdf8fae8b569bf9fff3b5171e669dcd7cf9c79e Highlights from the release notes are reproduced below. Some security and bug fixes were previously merged into FreeBSD and have been elided. See the upstream release notes for full details (https://www.openssh.com/releasenotes.html). --- Future deprecation notice ========================= OpenSSH plans to remove support for the DSA signature algorithm in early 2025. Potentially-incompatible changes -------------------------------- * sshd(8): the server will now block client addresses that repeatedly fail authentication, repeatedly connect without ever completing authentication or that crash the server. See the discussion of PerSourcePenalties below for more information. Operators of servers that accept connections from many users, or servers that accept connections from addresses behind NAT or proxies may need to consider these settings. * sshd(8): the server has been split into a listener binary, sshd(8), and a per-session binary "sshd-session". This allows for a much smaller listener binary, as it no longer needs to support the SSH protocol. As part of this work, support for disabling privilege separation (which previously required code changes to disable) and disabling re-execution of sshd(8) has been removed. Further separation of sshd-session into additional, minimal binaries is planned for the future. * sshd(8): several log messages have changed. In particular, some log messages will be tagged with as originating from a process named "sshd-session" rather than "sshd". * ssh-keyscan(1): this tool previously emitted comment lines containing the hostname and SSH protocol banner to standard error. This release now emits them to standard output, but adds a new "-q" flag to silence them altogether. * sshd(8): (portable OpenSSH only) sshd will no longer use argv[0] as the PAM service name. A new "PAMServiceName" sshd_config(5) directive allows selecting the service name at runtime. This defaults to "sshd". bz2101 New features ------------ * sshd(8): sshd(8) will now penalise client addresses that, for various reasons, do not successfully complete authentication. This feature is controlled by a new sshd_config(5) PerSourcePenalties option and is on by default. * ssh(8): allow the HostkeyAlgorithms directive to disable the implicit fallback from certificate host key to plain host keys. Portability ----------- * sshd(8): expose SSH_AUTH_INFO_0 always to PAM auth modules unconditionally. The previous behaviour was to expose it only when particular authentication methods were in use. * ssh(1), ssh-agent(8): allow the presence of the WAYLAND_DISPLAY environment variable to enable SSH_ASKPASS, similarly to the X11 DISPLAY environment variable. GHPR479 --- Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D48914 2025-02-19T12:25:55Z Ed Maste emaste@FreeBSD.org 2025-02-19T03:00:45Z urn:sha1:8a16d0831e70530b2fbd682e748bd051de35f192 Obtained from: OpenSSH 5e07dee272c3 Security: CVE-2025-26466 Sponsored by: The FreeBSD Foundation 2023-12-18T16:22:22Z Gordon Tetlow gordon@FreeBSD.org 2023-12-18T16:22:22Z urn:sha1:92f58c69a14c0afe910145f177c0e8aeaf9c7da4 This adds a protocol extension to improve the integrity of the SSH transport protocol, particular in and around the initial key exchange (KEX) phase. Full details of the extension are in the PROTOCOL file. OpenBSD-Commit-ID: 2a66ac962f0a630d7945fee54004ed9e9c439f14 Approved by: so (implicit) Obtained from: https://anongit.mindrot.org/openssh.git/patch/?id=1edb00c58f8a6875fad6a497aa2bacf37f9e6cd5 Security: CVE-2023-48795 2023-10-09T17:28:17Z Ed Maste emaste@FreeBSD.org 2023-10-09T17:28:17Z urn:sha1:edf8578117e8844e02c0121147f45e4609b30680 Excerpts from the release notes: Potentially incompatible changes -------------------------------- * ssh-keygen(1): generate Ed25519 keys by default. [NOTE: This change was already merged into FreeBSD.] * sshd(8): the Subsystem directive now accurately preserves quoting of subsystem commands and arguments. New features ------------ * ssh(1): add keystroke timing obfuscation to the client. * ssh(1), sshd(8): Introduce a transport-level ping facility. * sshd(8): allow override of Sybsystem directives in sshd Match blocks. Full release notes at https://www.openssh.com/txt/release-9.5 Relnotes: Yes Sponsored by: The FreeBSD Foundation 2023-08-11T03:10:18Z Ed Maste emaste@FreeBSD.org 2023-08-11T03:10:18Z urn:sha1:535af610a4fdace6d50960c0ad9be0597eea7a1b Excerpts from the release notes: * ssh-agent(1): PKCS#11 modules must now be specified by their full paths. Previously dlopen(3) could search for them in system library directories. * ssh(1): allow forwarding Unix Domain sockets via ssh -W. * ssh(1): add support for configuration tags to ssh(1). This adds a ssh_config(5) "Tag" directive and corresponding "Match tag" predicate that may be used to select blocks of configuration similar to the pf.conf(5) keywords of the same name. * ssh(1): add a "match localnetwork" predicate. This allows matching on the addresses of available network interfaces and may be used to vary the effective client configuration based on network location. * ssh-agent(1): improve isolation between loaded PKCS#11 modules by running separate ssh-pkcs11-helpers for each loaded provider. * ssh-agent(1), ssh(1): improve defences against invalid PKCS#11 modules being loaded by checking that the requested module contains the required symbol before loading it. * ssh(1): don't incorrectly disable hostname canonicalization when CanonicalizeHostname=yes and ProxyJump was expicitly set to "none". bz3567 Full release notes at https://www.openssh.com/txt/release-9.4 Relnotes: Yes Sponsored by: The FreeBSD Foundation