Patch Package: OTP 27.3.4.12
Git Tag: OTP-27.3.4.12
Date: 2026-05-27
Trouble Report Id: OTP-20112, OTP-20128, OTP-20129, OTP-20130,
OTP-20140, OTP-20141
Seq num: CVE-2026-42789, CVE-2026-42790, ERIERL-1314,
GH-11088, PR-11079, PR-11089, PR-11123,
PR-11124, PR-11125, PR-11136
System: OTP
Release: 27
Application: compiler-8.6.1.5, inets-9.3.2.5,
public_key-1.17.1.3, ssl-11.2.12.8
Predecessor: OTP 27.3.4.11
Check out the git tag OTP-27.3.4.12, 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
-
‘public_key’, Adhere to RFC 9525, and remove support for legacy fallback to
check hostname against subject common name. Also improve error handling
creating two separate errors for name constraint check for subject names and
subject alternative names.
‘ssl’. Error handling is slightly changed to better reflect public_key
behaviour.
Own Id: OTP-20130
Application(s): public_key, ssl
Related Id(s): PR-11124, CVE-2026-42790
compiler-8.6.1.5
The compiler-8.6.1.5 application can be applied independently of other
applications on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
In rare circumstances, optimization of boolean expressions could invert the
boolean value.
Own Id: OTP-20140
Related Id(s): GH-11088, PR-11089
Full runtime dependencies of compiler-8.6.1.5
crypto-5.1, erts-13.0, kernel-8.4, stdlib-6.0
inets-9.3.2.5
The inets-9.3.2.5 application can be applied independently of other applications
on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
A call to httpd:reload_config/2 now validates the new configuration before
removing the old one, leaving the server running in case of faulty config,
instead of putting it in an unrecoverable state.
Own Id: OTP-20128
Related Id(s): ERIERL-1314, PR-11079
Full runtime dependencies of inets-9.3.2.5
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
public_key-1.17.1.3
The public_key-1.17.1.3 application can be applied independently of other
applications on a full OTP 27 installation.
Fixed Bugs and Malfunctions
-
OCSP responder certificates are now checked for expiration before being
accepted as authorized responders. Previously, expired or not-yet-valid
responder certificates were incorrectly accepted when verifying OCSP
responses.
Own Id: OTP-20112
Related Id(s): PR-11136
-
Corrected basic constraint path validation check in accordance to RFC 5280.
Own Id: OTP-20129
Related Id(s): PR-11123, CVE-2026-42789
-
‘public_key’, Adhere to RFC 9525, and remove support for legacy fallback to
check hostname against subject common name. Also improve error handling
creating two separate errors for name constraint check for subject names and
subject alternative names.
‘ssl’. Error handling is slightly changed to better reflect public_key
behaviour.
Own Id: OTP-20130
Related Id(s): PR-11124, CVE-2026-42790
*** POTENTIAL INCOMPATIBILITY ***
Full runtime dependencies of public_key-1.17.1.3
asn1-5.0, crypto-5.0, erts-13.0, kernel-8.0, stdlib-4.0
ssl-11.2.12.8
Note! The ssl-11.2.12.8 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
-
‘public_key’, Adhere to RFC 9525, and remove support for legacy fallback to
check hostname against subject common name. Also improve error handling
creating two separate errors for name constraint check for subject names and
subject alternative names.
‘ssl’. Error handling is slightly changed to better reflect public_key
behaviour.
Own Id: OTP-20130
Related Id(s): PR-11124, CVE-2026-42790
*** POTENTIAL INCOMPATIBILITY ***
-
Could cause server to terminate a connection without an alert towards a bad
client.
Own Id: OTP-20141
Related Id(s): PR-11125
Full runtime dependencies of ssl-11.2.12.8
crypto-5.0, 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
Paul Guyot
