Patch Package: OTP 27.3.4.13
Git Tag: OTP-27.3.4.13
Date: 2026-06-10
Trouble Report Id: OTP-19631, OTP-20149, OTP-20150, OTP-20152,
OTP-20154, OTP-20155, OTP-20156, OTP-20160,
OTP-20161, OTP-20162, OTP-20165, OTP-20166,
OTP-20174
Seq num: CVE-2026-48855, CVE-2026-48856,
CVE-2026-48858, CVE-2026-48860,
CVE-2026-49759, CVE-2026-49760, GH-11093,
GH-11104, GH-11105, GH-SA-24cv-hwgr-37fq,
GH-SA-6f4f-chj5-5g97, GH-SA-gp7x-mfv6-52cv,
GH-SA-m75x-4vwg-ggjh, GH-SA-pv7g-pjrq-x2fh,
GH-SA-xcxj-5pg2-v72j, PR-11096, PR-11115,
PR-11145, PR-11146, PR-11148, PR-11181,
PR-11186, PR-11192, PR-11193, PR-11212,
PR-1234, PR-27384
System: OTP
Release: 27
Application: dialyzer-5.3.1.1, diameter-2.4.1.2,
erl_interface-5.5.2.1, erts-15.2.7.9,
ftp-1.2.3.1, inets-9.3.2.6, mnesia-4.23.5.3,
ssh-5.2.11.8, ssl-11.2.12.9
Predecessor: OTP 27.3.4.12
Check out the git tag OTP-27.3.4.13, 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.
dialyzer-5.3.1.1
The dialyzer-5.3.1.1 application can be applied independently of other
applications on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
Fix Dialyzer crash with overriding built-in types
Own Id: OTP-19631
Related Id(s): GH-11093, PR-11096
Full runtime dependencies of dialyzer-5.3.1.1
compiler-8.0, erts-12.0, kernel-8.0, stdlib-5.0, syntax_tools-2.0
diameter-2.4.1.2
The diameter-2.4.1.2 application can be applied independently of other
applications on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
Fixed return value documentation of
diameter:service_info(SvcName, statistics)
Own Id: OTP-20150
Related Id(s): GH-11105, PR-11146
Full runtime dependencies of diameter-2.4.1.2
erts-10.0, kernel-3.2, ssl-9.0, stdlib-5.0
erl_interface-5.5.2.1
The erl_interface-5.5.2.1 application can be applied independently of other
applications on a full OTP 27 installation.
Fixed Bugs and Malfunctions
erts-15.2.7.9
The erts-15.2.7.9 application can be applied independently of other applications
on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
Fixed bug in ets:member/2 for set, bag and duplicate_bag. The bug
could (maybe) lead to ets:member spuriously returning false for a value
which is actually a member for a table that faces high insert load.
Own Id: OTP-20152
Related Id(s): PR-11115
-
A buffer overflow error when parsing SCTP ERROR or ABORT chunks has been
fixed.
This could lead to stack corruption and VM crash, but ultimately with hard
work by an attacker be refined into maybe even remote code execution.
Own Id: OTP-20165
Related Id(s): GH-SA-6f4f-chj5-5g97, PR-1234, CVE-2026-49759
Full runtime dependencies of erts-15.2.7.9
kernel-9.0, sasl-3.3, stdlib-4.1
ftp-1.2.3.1
The ftp-1.2.3.1 application can be applied independently of other applications
on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
FTP client default connections that use the so called passive mode of FTP
fails to properly validating the response IP of the server, hence a malicious
or compromised FTP server could redirect the data connection to an arbitrary
host, enabling s server-side request forgery (SSRF) and FTP bounce attacks.
Own Id: OTP-20166
Related Id(s): GH-SA-24cv-hwgr-37fq, PR-11186, CVE-2026-48858
Full runtime dependencies of ftp-1.2.3.1
erts-7.0, kernel-6.0, runtime_tools-1.15.1, ssl-10.2, stdlib-3.5
inets-9.3.2.6
The inets-9.3.2.6 application can be applied independently of other applications
on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
The HTTP client (httpc) now removes Authorization, Proxy-Authorization,
Cookie, Referer, and Origin headers when following a redirect to a different
host or port. Previously these headers were forwarded verbatim, potentially
leaking credentials to unintended targets.
This follows the requirements of RFC 9110 §15.4.
Own Id: OTP-20155
Related Id(s): GH-SA-m75x-4vwg-ggjh, PR-11212, CVE-2026-48856
Full runtime dependencies of inets-9.3.2.6
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-4.23.5.3
The mnesia-4.23.5.3 application can be applied independently of other
applications on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
Fixed docs of mnesia:write/3 to clarify when a transaction can terminate.
Own Id: OTP-20149
Related Id(s): GH-11104, PR-11145
Full runtime dependencies of mnesia-4.23.5.3
erts-9.0, kernel-5.3, stdlib-5.0
ssh-5.2.11.8
The ssh-5.2.11.8 application can be applied independently of other applications
on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
Fixed SSH_FXP_READLINK handler in ssh_sftpd to strip the backend root prefix
from symlink targets before returning them to the client, preventing
disclosure of the server’s absolute filesystem path when the root option is
configured.
Own Id: OTP-20162
Related Id(s): GH-SA-pv7g-pjrq-x2fh, PR-11192, CVE-2026-48855
Full runtime dependencies of ssh-5.2.11.8
crypto-5.0, erts-14.0, kernel-9.0, public_key-1.6.1, runtime_tools-1.15.1,
stdlib-5.0, stdlib-6.0
ssl-11.2.12.9
Note! The ssl-11.2.12.9 application cannot be applied independently of other
applications on an arbitrary OTP 27 installation.
On a full OTP 27 installation, also the following runtime
dependency has to be satisfied:
-- public_key-1.17.1.3 (first satisfied in OTP 27.3.4.12)
Fixed Bugs and Malfunctions
-
Fix miscellanies issues that could cause unnecessary memory consumption and in
some less common scenarios or configurations cause connection failures.
Own Id: OTP-20154
Related Id(s): PR-11148
-
Erlang distribution over TLS run with the kernel ‘check_ip’ flag now properly
enforce connecting nodes to be on the same LAN.
Own Id: OTP-20156
Related Id(s): GH-SA-gp7x-mfv6-52cv, PR-11181, CVE-2026-48860
-
Enhance error message, by fixing typo of atom in new error message related to
`public_key` CVE-2026-42790 solution.
Own Id: OTP-20161
Related Id(s): PR-11148
-
Corrected SNI handling for TLS-1.3 only server, could cause connection
failures if supported signature algorithms where changed by SNI option update.
Own Id: OTP-20174
Related Id(s): PR-27384
Full runtime dependencies of ssl-11.2.12.9
crypto-5.1, erts-15.0, inets-5.10.7, kernel-9.0, public_key-1.17.1.3,
runtime_tools-1.15.1, stdlib-6.0
Thanks to
John Downey, Jonatan Männchen, Maria Scott
