FreeBSD source tree http://cgit.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 2025-08-07T13:54:34Z Pierre Pronchery khorben@FreeBSD.org 2025-07-11T21:57:10Z urn:sha1:4757b351ea9d59d71d4a38b82506d2d16fcd560d Migrate to OpenSSL 3.5 in advance of FreeBSD 15.0. OpenSSL 3.0 will be EOL after 2026-09-07. Approved by: philip (mentor) Sponsored by: Alpha-Omega Beach Cleaning Project Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D51613 2025-06-05T23:55:34Z Brooks Davis brooks@FreeBSD.org 2025-06-05T23:55:34Z urn:sha1:8e35800732573de6c4bc1dd3ac420447fca96231 Commit 1cbb58886a47 (shipped in 12.0.0) removed all lint infrastructure. A bunch of NO_LINT definitions remained (perhaps as a bootstrapping measture). Remove them. Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D50704 2025-05-20T22:58:23Z Jose Luis Duran jlduran@FreeBSD.org 2025-05-20T22:58:23Z urn:sha1:ac62b97951c25a33ec0880e574ccff31be7452f7 sshkey.c references sshsk_sign(), which is defined in ${SKSRCS}. Due to how FreeBSD builds libssh, or put differently, due to upstream not building a shared libssh.so, we need to partially revert 65d8491719bb ("secure: Adapt Makefile to ssh-sk-client everywhere"), and add ${SKSRCS} back, to avoid linking problems, especially when building with GCC: /usr/local/bin/ld: /usr/obj/usr/src/amd64.amd64/secure/lib/libssh/libprivatessh.so: undefined reference to `sshsk_sign' collect2: error: ld returned 1 exit status` Put the sources in a separate line, to maintain line-by-line compatibility with upstream Makefile.in PR: 286580 Reviewed by: emaste Approved by: emaste (mentor) Fixes: 65d8491719bb ("secure: Adapt Makefile to ssh-sk-client everywhere") Differential Revision: https://reviews.freebsd.org/D50020 2025-04-17T19:12:39Z Jose Luis Duran jlduran@FreeBSD.org 2025-04-17T19:08:02Z urn:sha1:65d8491719bbc88ed45637d2381931c2d29cfe87 Upstream commit 7b47b40b1 ("adapt Makefile to ssh-sk-client everywhere") adapted the Makefiles to ssh-sk-client. Do the same here. Reviewed by: emaste Approved by: emaste (mentor) Differential Revision: https://reviews.freebsd.org/D49795 2025-04-17T19:12:05Z Jose Luis Duran jlduran@FreeBSD.org 2025-04-17T18:56:00Z urn:sha1:9440aad19dca73fdd224b128ac2dc2e78191ff15 SRCS entries are kept in the same order and with the same line breaks as upstream, to make comparison easier. No functional change intended. Reviewed by: emaste Approved by: emaste (mentor) Differential Revision: https://reviews.freebsd.org/D49793 2025-02-20T23:33:46Z Ed Maste emaste@FreeBSD.org 2022-04-12T13:18:20Z urn:sha1:d71e7e57fc1472e3ea6d31c44e187c2819d2c71e Commit 9d63429fa163 ("ssh: move common Makefile boilerplate to a new ssh.mk") introduced ssh.mk for common OpenSSH paths and flags, as part of enabling FIDO/U2F. Move duplicated MK_LDNS and MK_TCP_WRAPPERS handling there. Reviewed by: kevans Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D31896 2025-02-20T22:39:48Z Ed Maste emaste@FreeBSD.org 2022-03-02T14:45:23Z urn:sha1:7f916236044d9a733de8b3c47b5dcbf71988cb03 Centralize optional krb5_config.h handling in ssh.mk. Do not add headers (that are committed to the src tree) to SRCS as there is no need. Reviewed by: imp, jlduran, kevans (all earlier) MFC after: 1 month Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D34409