Patch Package: OTP 29.0.4
Git Tag: OTP-29.0.4
Date: 2026-07-27
Trouble Report Id: OTP-20136, OTP-20143, OTP-20214, OTP-20229,
OTP-20237, OTP-20239, OTP-20240, OTP-20241,
OTP-20242, OTP-20243, OTP-20244, OTP-20245,
OTP-20248, OTP-20250, OTP-20251, OTP-20257,
OTP-20258, OTP-20259, OTP-20260, OTP-20261
Seq num: CVE-2026-42792, CVE-2026-47078,
CVE-2026-54890, CVE-2026-55737,
CVE-2026-55953, CVE-2026-58227, ERIERL-1341,
GH-11319, GH-11332, GH-11368,
GH-SA-622p-qfh6-c352, GH-SA-7xgh-gmgf-q2g7,
PR-11239, PR-11297, PR-11303, PR-11323,
PR-11330, PR-11331, PR-11333, PR-11334,
PR-11336, PR-11337, PR-11341, PR-11343,
PR-11369, PR-11372, PR-11374, PR-11386,
PR-27944
System: OTP
Release: 29
Application: compiler-10.0.3, crypto-5.9.2,
diameter-2.7.2, erts-17.0.4, megaco-4.9.1,
public_key-1.21.4, ssh-6.0.3, ssl-11.7.4,
stdlib-8.0.3
Predecessor: OTP 29.0.3
Check out the git tag OTP-29.0.4, 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
- Mitigated a denial of service attack in epmd.
Thanks to Ryan Moore for finding and responsibly disclosing this vulnerability to the Erlang/OTP project.
Own Id: OTP-20136
Application(s): erts
Related Id(s): PR-11386, CVE-2026-42792
compiler-10.0.3
The compiler-10.0.3 application can be applied independently of other applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
- compiler: Fix an internal consistency check failure with setelement
Own Id: OTP-20261
Related Id(s): GH-11368, PR-11374
KOMAC_HEADER Full runtime dependencies of compiler-10.0.3
crypto-5.1, erts-13.0, kernel-8.4, stdlib-8.0
crypto-5.9.2
The crypto-5.9.2 application can be applied independently of other applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
- Fixed crash in crypto:macN/5 when supplied MacLength was greater than length of what the underlying hash returned.
Own Id: OTP-20239
Related Id(s): PR-11239
- Fixed segfault in crypto:aead_cipher_init_nif when argument validation fails.
Own Id: OTP-20241
Related Id(s): PR-11330
- Fix cipher key buffer overread for chacha20_poly1305.
Own Id: OTP-20244
Related Id(s): PR-11337
KOMAC_HEADER Full runtime dependencies of crypto-5.9.2
erts-9.0, kernel-6.0, stdlib-3.9
diameter-2.7.2
The diameter-2.7.2 application can be applied independently of other applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
- Fix infinite loop in diameter_dist:route_session/2 when avp other than Session-Id has zero length.
Own Id: OTP-20242
Related Id(s): PR-11331
- Fix crash in diameter_dist:route_session/2 when Session-Id (code: 263) avp has zero length.
Own Id: OTP-20243
Related Id(s): PR-11333
KOMAC_HEADER Full runtime dependencies of diameter-2.7.2
erts-10.0, kernel-3.2, ssl-9.0, stdlib-5.0
erts-17.0.4
The erts-17.0.4 application can be applied independently of other applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
- Mitigated a denial of service attack in epmd.
Thanks to Ryan Moore for finding and responsibly disclosing this vulnerability to the Erlang/OTP project.
Own Id: OTP-20136
Related Id(s): PR-11386, CVE-2026-42792
*** POTENTIAL INCOMPATIBILITY ***
- Fixed heap corruption when an invalidly encoded tuple with an arity of 2^31 or larger is decoded from Erlang's External Term Format (binary_to_term).
Own Id: OTP-20214
Related Id(s): PR-11297, CVE-2026-55737
- When send_timeout is set and send_timeout_close is set to true, a 'tcp_closed' message is expected when the timeout occurs, but that (message) was not delivered. This has now been fixed.
Own Id: OTP-20257
Related Id(s): GH-11319
- A crafted External Term Format (ETF) payload could crash the runtime system.
Thanks to Paul Guyot for finding and responsibly disclosing this vulnerability to the Erlang/OTP project.
Own Id: OTP-20259
Related Id(s): PR-11386, CVE-2026-54890
- Fixed a rounding error in 16-bit float conversion.
Own Id: OTP-20260
Related Id(s): GH-11332, PR-11334
KOMAC_HEADER Full runtime dependencies of erts-17.0.4
kernel-9.0, sasl-3.3, stdlib-4.1
megaco-4.9.1
The megaco-4.9.1 application can be applied independently of other applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
- Fixed a buffer overflow in the megaco flex scanner C driver. A property parm name exceeding 452 bytes in a text-encoded H.248 message could overflow a fixed-size error buffer, crashing the VM. The sprintf calls have been replaced with bounded snprintf.
Own Id: OTP-20237
Related Id(s): GH-SA-7xgh-gmgf-q2g7, PR-11323
KOMAC_HEADER Full runtime dependencies of megaco-4.9.1
asn1-3.0, debugger-4.0, erts-12.0, et-1.5, kernel-8.0, runtime_tools-1.8.14, stdlib-2.5
public_key-1.21.4
The public_key-1.21.4 application can be applied independently of other applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
- A certificate chain with crafted policyMappings extensions could cause exponential memory consumption during path validation, exploitable via TLS handshake. Chains exceeding a node-count cap are now rejected with {bad_cert, policy_tree_exceeded}.
Own Id: OTP-20251
Related Id(s): GH-SA-622p-qfh6-c352, PR-11372
KOMAC_HEADER Full runtime dependencies of public_key-1.21.4
asn1-5.0, crypto-5.8, erts-13.0, kernel-8.0, stdlib-4.0
ssh-6.0.3
The ssh-6.0.3 application can be applied independently of other applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
- DH key exchange now enforces strict bounds (1 < e/f < p-1, 1 < K < p-1) on all paths, matching OpenSSH and Go. No interop impact.
Own Id: OTP-20229
Related Id(s): PR-11303
- Validate DH group parameters (P, G) received from the server during DH-GEX key exchange. The client now rejects groups where P is smaller than 2048 bits or G is not in the range (1, P-1). The default minimum in dh_gex_limits has been raised to 2048 on both client and server.
Own Id: OTP-20258
Related Id(s): ERIERL-1341, PR-11369
KOMAC_HEADER Full runtime dependencies of ssh-6.0.3
crypto-5.7, erts-14.0, kernel-10.3, public_key-1.6.1, runtime_tools-1.15.1, stdlib-8.0
ssl-11.7.4
Note! The ssl-11.7.4 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
- Add pre TLS-1.3 client side validation of servers algorithm selection being part of clients offered algorithms, preventing in worst case MITM circumventing validation of server certificate tricking the client to trust the malicious MITM as it was a valid server. Note this check is already performed for TLS-1.3 clients.
Own Id: OTP-20240
Related Id(s): PR-11336, CVE-2026-55953
- Prevent invalid cert chains to create cycles in chain building code used to handle chains that could be unordered or contain extraneous certs. This avoids a DoS attack possibility.
Own Id: OTP-20245
Related Id(s): PR-11343, CVE-2026-58227
- Clarify that rsa_psk and anonymous key exchange algorithms are considered legacy. Also harden rsa_psk in same way as normal rsa key exchange.
Own Id: OTP-20248
Related Id(s): PR-11341
- Harden SSL application to conform with best practice and RFC's. This will mostly improve error messages and conserve memory usage.
Own Id: OTP-20250
Related Id(s): PR-27944
- A certificate chain with crafted policyMappings extensions could cause exponential memory consumption during path validation, exploitable via TLS handshake. Chains exceeding a node-count cap are now rejected with {bad_cert, policy_tree_exceeded}.
Own Id: OTP-20251
Related Id(s): GH-SA-622p-qfh6-c352, PR-11372
KOMAC_HEADER Full runtime dependencies of ssl-11.7.4
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-8.0.3
The stdlib-8.0.3 application can be applied independently of other applications on a full OTP 29 installation.
Fixed Bugs and Malfunctions
- Fixed a bug where zip:unzip/1,2 and zip:extract/1,2 were vulnerable to a relative path traversal attack. A crafted zip archive containing entry names such as ../x/y could have caused files to be written outside the intended extraction directory.
Thanks to Jonatan Männchen and Zhang Delong for finding and responsibly disclosing this vulnerability to the Erlang/OTP project.
Own Id: OTP-20143
Related Id(s): PR-11386, CVE-2026-47078
KOMAC_HEADER Full runtime dependencies of stdlib-8.0.3
compiler-5.0, crypto-4.5, erts-16.0.3, kernel-11.0, sasl-3.0, syntax_tools-3.2.1
Thanks to
a1x-an, Jonatan Männchen
