Patch Package: OTP 29.0.1 Git Tag: OTP-29.0.1 Date: 2026-05-27 Trouble Report Id: OTP-20112, OTP-20129, OTP-20130, OTP-20134, OTP-20138, OTP-20139, OTP-20140, OTP-20141, OTP-20146 Seq num: CVE-2026-42789, CVE-2026-42790, ERIERL-1321, GH-11088, PR-11007, PR-11089, PR-11100, PR-11107, PR-11123, PR-11124, PR-11125, PR-11135, PR-11136 System: OTP Release: 29 Application: compiler-10.0.1, erts-17.0.1, kernel-11.0.1, public_key-1.21.1, snmp-5.20.4, ssl-11.7.1 Predecessor: OTP 29.0 Check out the git tag OTP-29.0.1, 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-10.0.1 The compiler-10.0.1 application can be applied independently of other applications on a full OTP 29 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
• The compiler could crash when compiling code using native records in certain ways. Own Id: OTP-20146 Related Id(s): PR-11135

KOMAC_HEADER Full runtime dependencies of compiler-10.0.1

crypto-5.1, erts-13.0, kernel-8.4, stdlib-8.0

erts-17.0.1 The erts-17.0.1 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

• Comparison of two native records could return an incorrect result or crash the runtime system. Own Id: OTP-20139 Related Id(s): PR-11107

KOMAC_HEADER Full runtime dependencies of erts-17.0.1

kernel-9.0, sasl-3.3, stdlib-4.1

kernel-11.0.1 The kernel-11.0.1 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

• SCTP peeloff of an IPv6 socket, the peeled-off socket does not inherit the parent options as expected. Own Id: OTP-20134 Related Id(s): PR-11007

KOMAC_HEADER Full runtime dependencies of kernel-11.0.1

crypto-5.8, erts-17.0, sasl-3.0, stdlib-8.0

public_key-1.21.1 The public_key-1.21.1 application can be applied independently of other applications on a full OTP 29 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 ***

KOMAC_HEADER Full runtime dependencies of public_key-1.21.1

asn1-5.0, crypto-5.8, erts-13.0, kernel-8.0, stdlib-4.0

snmp-5.20.4 The snmp-5.20.4 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

• Fixed a bug in snmpm_usm:generate_outgoing_msg/5 that caused a badmatch crash when constructing an error response for an unknown user/engineID combination. Own Id: OTP-20138 Related Id(s): ERIERL-1321, PR-11100

KOMAC_HEADER Full runtime dependencies of snmp-5.20.4

asn1-5.4, crypto-4.6, erts-12.0, kernel-8.0, mnesia-4.12, runtime_tools-1.8.14, stdlib-5.0

ssl-11.7.1 Note! The ssl-11.7.1 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

• '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

KOMAC_HEADER Full runtime dependencies of ssl-11.7.1

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

Thanks to Martin Hässler, Paul Guyot