Patch Package: OTP 29.1.2
Git Tag: OTP-29.1.2
Date: 2026-10-14
Trouble Report Id: OTP-20359, OTP-20360, OTP-20385, OTP-20392,
OTP-20394, OTP-20408, OTP-20415, OTP-20418,
OTP-20420, OTP-20423, OTP-20426, OTP-20427,
OTP-20428, OTP-20437, OTP-20438, OTP-20439,
OTP-20440, OTP-20442, OTP-20444, OTP-20445,
OTP-20447, OTP-20456
Seq num: CVE-2026-105236, CVE-2026-42789,
CVE-2026-48856, CVE-2026-94200,
CVE-2026-96596, ERIERL-1362, ERIERL-1367,
GH-11620, GH-11691, GH-11702, GH-11709,
GH-11724, GH-11735, GH-11748, GH-11762,
GH-SA-m75x-4vwg-ggjh, GH-SA-q7cq-pfgf-5hr7,
OTP-20155, OTP-20346, PR-11474, PR-11561,
PR-11623, PR-11662, PR-11692, PR-11707,
PR-11708, PR-11719, PR-11720, PR-11727,
PR-11753, PR-11755, PR-11763, PR-11767,
PR-11768, PR-11773, PR-11791, PR-11808,
PR-11823, PR-11824, PR-11825
System: OTP
Release: 29
Application: compiler-10.0.7, dialyzer-6.0.4, erts-17.1.1,
inets-9.8.1, mnesia-4.27.1, odbc-2.17.2,
public_key-1.21.8, snmp-5.20.6, ssh-6.0.7,
ssl-11.7.8, stdlib-8.1.1
Predecessor: OTP 29.1.1
Check out the git tag OTP-29.1.2, and build a full OTP system including
documentation. Apply one or more applications from this build as patches to your
installation using the ‘otp_patch_apply’ tool. For information on install
requirements, see descriptions for each application version below.
POTENTIAL INCOMPATIBILITIES
-
When the max_channels limit is reached for a port-forwarding channel
(direct-tcpip or forwarded-tcpip), the SSH daemon now refuses the individual
channel with SSH_MSG_CHANNEL_OPEN_FAILURE and keeps the connection alive,
instead of terminating the whole SSH connection. Port-forwarding channels now
behave like session channels, which already survived the limit, and this
matches OpenSSH. Applications that relied on the connection being closed when
the channel limit was reached must instead handle the channel-open failure.
Own Id: OTP-20420
Application(s): ssh
Related Id(s): PR-11708
compiler-10.0.7
The compiler-10.0.7 application can be applied independently of other
applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
-
Fix native record bugs when used together with try...catch
Own Id: OTP-20415
Related Id(s): GH-11691, PR-11719
-
Compilation of a function with thousands of clauses would be very slow.
Own Id: OTP-20437
Related Id(s): GH-11735, PR-11767
-
Sometimes compiling with deterministic would not guarantee generation of
identical BEAM files for every build.
Own Id: OTP-20438
Related Id(s): GH-11748, PR-11753
-
A crash in sys_core_fold on native record patterns has been eliminated.
Own Id: OTP-20440
Related Id(s): GH-11724, PR-11768
Full runtime dependencies of compiler-10.0.7
crypto-5.1, erts-13.0, kernel-8.4, stdlib-8.0
dialyzer-6.0.4
The dialyzer-6.0.4 application can be applied independently of other
applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
-
Dialyzer will now avoid an infinite loop when multiple nominal types with the
same structure are analyzed together.
Own Id: OTP-20444
Related Id(s): GH-11762, PR-11763
Full runtime dependencies of dialyzer-6.0.4
compiler-10.0, erts-12.0, kernel-8.0, stdlib-5.0, syntax_tools-2.0
erts-17.1.1
The erts-17.1.1 application can be applied independently of other applications
on a full OTP 29 installation.
Fixed Bugs and Malfunctions
-
Two trace sessions that trace garbage_collection on the same process crash
the emulator on the first collection.
trace_gc() in erl_trace.c builds the GC info list on a temporary heap for
the first session and frees it inside the session loop. The next session
reuses msg, which now points into freed memory.
The memory is now freed after the session loop, which removes the
use-after-free.
Own Id: OTP-20385
Related Id(s): PR-11623
-
Fix native record bugs when used together with try...catch
Own Id: OTP-20415
Related Id(s): GH-11691, PR-11719
Full runtime dependencies of erts-17.1.1
kernel-9.0, sasl-3.3, stdlib-4.1
inets-9.8.1
The inets-9.8.1 application can be applied independently of other applications
on a full OTP 29 installation.
Fixed Bugs and Malfunctions
-
Credentials supplied in the userinfo component of a request URI
(http://user``:password@host/path) were still sent to the redirect target when
httpc followed a cross-origin redirect. The userinfo component is now
cleared together with the sensitive headers whenever the redirect target
differs in host or port from the original request. Redirects that stay within
the same origin are unaffected and still carry the credentials.
Own Id: OTP-20456
Related Id(s): GH-SA-m75x-4vwg-ggjh, PR-11825, CVE-2026-48856, OTP-20155
Full runtime dependencies of inets-9.8.1
erts-14.0, kernel-9.0, mnesia-4.12, public_key-1.13, runtime_tools-1.8.14,
ssl-9.0, stdlib-5.0, stdlib-6.0
mnesia-4.27.1
The mnesia-4.27.1 application can be applied independently of other applications
on a full OTP 29 installation.
Fixed Bugs and Malfunctions
-
Fixed the type specification for mnesia:restore/2, which incorrectly listed
the operation restore_tables instead of recreate_tables, causing Dialyzer
to reject valid calls and accept invalid ones.
Own Id: OTP-20442
Related Id(s): PR-11755
Full runtime dependencies of mnesia-4.27.1
erts-9.0, kernel-5.3, stdlib-5.0
odbc-2.17.2
The odbc-2.17.2 application can be applied independently of other applications
on a full OTP 29 installation.
Fixed Bugs and Malfunctions
Full runtime dependencies of odbc-2.17.2
erts-6.0, kernel-3.0, stdlib-2.0
public_key-1.21.8
The public_key-1.21.8 application can be applied independently of other
applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
-
Enforce the RFC 5280 basic-constraints CA checks for X.509 version 1 and
version 2 certificates during certificate path validation. A v1/v2 certificate
carries no extensions and therefore no basicConstraints, so it must never be
accepted as a CA; such a certificate is now rejected in issuer position with
{bad_cert, missing_basic_constraint} while remaining valid as a leaf. This
closes the version-1 path left uncovered by the earlier CVE-2026-42789 fix.
Own Id: OTP-20423
Related Id(s): PR-11727, CVE-2026-42789
Full runtime dependencies of public_key-1.21.8
asn1-5.0, crypto-5.8, erts-13.0, kernel-8.0, stdlib-4.0
snmp-5.20.6
The snmp-5.20.6 application can be applied independently of other applications
on a full OTP 29 installation.
Fixed Bugs and Malfunctions
-
The SNMP agent no longer fails to answer an SNMPv3 message whose msgUserName
matches the configured terminating-discovery trigger_username (by default the
empty string) and whose msgAuthoritativeEngineID is the agent’s own engine ID.
Such a message is not a stage-1 discovery request, but the agent treated it as
one and then failed while generating the report, logging a configuration error
and discarding the request without responding. The agent now answers it with a
usmStatsUnknownUserNames report, as prescribed by RFC 3414, section 3.2. As a
consequence of the same change, a message carrying the trigger user name
together with an unknown, non-empty engine ID is now answered with a
usmStatsUnknownEngineIDs report instead of being silently discarded.
Own Id: OTP-20427
Related Id(s): ERIERL-1362, PR-11823
-
The byte-length bounds added in OTP-20346 for varbind values now apply to
every integer field decoded by snmp_pdus: the v3 header fields msgID,
msgMaxSize and msgSecurityModel, the USM security parameters
msgAuthoritativeEngineBoots and msgAuthoritativeEngineTime, and the PDU fields
request-id, error-status, error-index, non-repeaters, max-repetitions,
generic-trap and specific-trap. Each field accepts at most the number of BER
content octets that its type requires, instead of an arbitrary number of
octets that were converted into a large integer. An over-long integer is now
signalled with an exit rather than a throw. Code that calls the exported
snmp_pdus decode functions inside a catch will receive {‘EXIT’, Reason} where
it previously received the thrown term directly. Inside the agent and manager,
such a message is now discarded and counted in snmpInASNParseErrs; previously
it caused a case_clause failure during message processing.
Own Id: OTP-20428
Related Id(s): GH-SA-q7cq-pfgf-5hr7, PR-11824, OTP-20346
Full runtime dependencies of snmp-5.20.6
asn1-5.4, crypto-4.6, erts-12.0, kernel-8.0, mnesia-4.12,
runtime_tools-1.8.14, stdlib-5.0
ssh-6.0.7
The ssh-6.0.7 application can be applied independently of other applications on
a full OTP 29 installation.
Fixed Bugs and Malfunctions
-
Fixed a bug where SSH CLI sessions using {shell, {shell, start, }} did not
handle latin1-encoded put_chars messages from the Erlang shell. This caused
exception output (e.g. “** exception error: …”) to not be displayed on the
SSH client, and {unhandled_request, …} messages to appear on the daemon
host.
Own Id: OTP-20359
Related Id(s): PR-11474
-
Fixed the following bugs in the SSH application:
- The SFTP client (ssh_sftp) checked the channel state record against 0
instead of the exit status integer when handling an exit_status message. The
success branch was therefore dead code, and every SFTP subsystem exit —
including a clean exit with status 0 — was reported to callers as an error.
A clean exit is now reported as a normal stop.
- The SSH_FXP_EXTENDED_REPLY decoder in ssh_xfer bound only a single byte of
the reply payload instead of the full binary (the pattern was missing a
/binary specifier). This made SFTP extension operations such as
statvfs@openssh.com fail with a function_clause crash whenever the payload
was not exactly one byte.
- The TCP forwarding acceptor supervisor used the default permanent restart
strategy, causing the acceptor to be restarted unnecessarily when a
forwarded socket closed normally. The child now uses a transient restart
strategy.
- The keyboard_interact_fun handling returned the atom nok instead of not_ok
on an invalid response, causing a crash during SSH message encoding instead
of a clean authentication rejection.
- The ssh*client_channel catch pattern error:{undef, *} never matched Erlang’s
actual error:undef exception, so a missing optional handle_call/3 or
handle_cast/2 callback crashed the channel process instead of being ignored.
The catch now matches error:undef and uses erlang:function_exported/3 to
tell a genuinely missing optional callback (ignored, as before) from an
undef raised deeper inside an implemented callback (now re-raised instead of
being silently swallowed).
- Both ssh_tcpip_forward_client and ssh_tcpip_forward_srv called
gen_tcp:close(undefined) in terminate/2 when the forwarding socket was never
established (or already closed), producing noisy crash reports on normal
forward teardown. terminate/2 now handles the undefined socket.
Own Id: OTP-20360
Related Id(s): PR-11561
-
Fixed an SSH port-forwarding acceptor crash triggered by a peer that connects
and immediately resets the connection. Transient TCP errors from accept and
peername are now handled gracefully instead of terminating the acceptor.
Own Id: OTP-20392
Related Id(s): PR-11720
-
When the max_channels limit is reached for a port-forwarding channel
(direct-tcpip or forwarded-tcpip), the SSH daemon now refuses the individual
channel with SSH_MSG_CHANNEL_OPEN_FAILURE and keeps the connection alive,
instead of terminating the whole SSH connection. Port-forwarding channels now
behave like session channels, which already survived the limit, and this
matches OpenSSH. Applications that relied on the connection being closed when
the channel limit was reached must instead handle the channel-open failure.
Own Id: OTP-20420
Related Id(s): PR-11708
*** POTENTIAL INCOMPATIBILITY ***
Full runtime dependencies of ssh-6.0.7
crypto-5.7, erts-14.0, kernel-10.3, public_key-1.6.1, runtime_tools-1.15.1,
stdlib-8.0
ssl-11.7.8
Note! The ssl-11.7.8 application cannot be applied independently of other
applications on an arbitrary OTP 29 installation.
On a full OTP 29 installation, also the following runtime
dependency has to be satisfied:
-- public_key-1.21.1 (first satisfied in OTP 29.0.1)
Fixed Bugs and Malfunctions
-
DoS attack prevention missed corner case, now fall back to the incomplete
peer-only chain handling when paths/2 yields no path, restoring the OTP 28
behavior and matching OpenSSL, curl and browsers. The digraph and its
chain-length limit from PR #11343 are unchanged, so the DoS protection is
preserved; the extra cost is one trust-store lookup, as for a leaf-only chain.
Own Id: OTP-20394
Related Id(s): GH-11620, PR-11662
-
The equivalent options dh and dhfile where unintentionally ignored and the
default value was used instead.
Own Id: OTP-20408
Related Id(s): ERIERL-1367, PR-11692
-
Redesign TLS-1.3 auto client ticket handling to adhere to RFC single-use by
consuming a ticket when offered removing it from the client ticket store. This
resolves unnecessary connections errors for concurrent client connections that
previously could end up trying to use the same ticket, or tickets being
evicted form the client store when a client still needed to look it up.
Own Id: OTP-20418
Related Id(s): GH-11702, GH-11709, PR-11707
-
Validate the handshake message type when decoding TLS-1.3 hello extensions
(RFC 8446 / RFC 9846). A malicious or man-in-the-middle TLS-1.3 server could
send a NewSessionTicket carrying a zero-length early_data extension, which a
client with automatic session-ticket management (session_tickets => auto)
stored and then crashed on during a later resumption, taking down the
node-global client ticket store and disrupting TLS-1.3 resumption for the
whole node. Extensions are now decoded only in the handshake messages in which
they are permitted, so such a ticket is ignored instead of poisoning the
store. This avoids a denial-of-service possibility.
Own Id: OTP-20426
Related Id(s): PR-11773, CVE-2026-94200
-
Fixed a TLS/DTLS session resumption flaw ((D)TLS-1.2 abbreviated handshake)
where an SNI-aware server could resume a cached session even when the
resumption request’s server_name differed from the one that established the
session, violating RFC 6066 §3. In virtual-hosting deployments where several
SNI names share one server certificate but apply different
client-authentication trust, a client could resume a session established under
one SNI name while connecting under another — bypassing the second virtual
service’s client-authentication boundary and skipping the certificate
exchange.
The server now binds the establishing SNI hostname to the session and refuses
resumption (falling back to a full handshake) when the requested SNI differs.
A request without SNI only matches a session established without SNI, so
ordinary non-SNI resumption is unaffected.
As a related correction, a listener’s derived reuse_sessions default (enabled
under verify_none) is no longer carried into an SNI virtual service that
switches to verify_peer; such a service must enable reuse_sessions explicitly.
Own Id: OTP-20445
Related Id(s): PR-11773, CVE-2026-105236
Full runtime dependencies of ssl-11.7.8
crypto-5.8, erts-16.0, inets-5.10.7, kernel-10.3, public_key-1.21.1,
runtime_tools-1.15.1, stdlib-7.0
stdlib-8.1.1
The stdlib-8.1.1 application can be applied independently of other applications
on a full OTP 29 installation.
Fixed Bugs and Malfunctions
-
A loop with Unreachable Exit Condition (‘Infinite Loop’) vulnerability in the
erl_tar module allowed an attacker who supplied a tar archive to cause a
denial of service via a crafted GNU sparse member. This has been corrected.
In addition, when attempting to extract a tar file with a legal GNU sparse
member, extraction could fail with a badarg exception. That has also been
corrected.
Own Id: OTP-20447
Related Id(s): PR-11791, CVE-2026-96596
Full runtime dependencies of stdlib-8.1.1
compiler-5.0, crypto-4.5, erts-16.0.3, kernel-11.0, sasl-3.0,
syntax_tools-3.2.1
Thanks to
Alexey Aristov, Daniel Gorin, Marcelino Alberdi Pereira, Marko Mindek, Miguel
Rubinos Rodríguez
