Upstream information

CVE-2026-55953 at MITRE

Description

The Erlang/OTP ssl TLS 1.2 (and earlier) and DTLS client does not verify that the cipher suite selected by the server in ServerHello was among the suites offered by the client in ClientHello. The client-side tls_handshake:hello/5 handler validates the negotiated protocol version and the downgrade sentinel but hands the server-chosen suite directly to ssl_handshake:handle_server_hello_extensions/9, which installs it without a membership check. The TLS 1.3 client path performs this check (per RFC 8446), so it is not affected.

An on-path attacker between the client and the intended server can respond with a ServerHello selecting an anonymous key exchange suite such as TLS_DH_anon_* or TLS_ECDH_anon_* that the client never offered. Anonymous suites do not require the server to present a certificate, so the entire verify_peer and cacerts configuration is bypassed: the attacker completes the handshake with its own ephemeral parameters, no certificate is validated, no hostname is checked, and ssl:connect returns {ok, Socket}. All subsequent application traffic is readable and modifiable by the attacker.

This issue affects OTP from OTP R13B03 before OTP 27.3.4.15, from OTP 28.0 before OTP 28.5.0.4, and from OTP 29.0 before OTP 29.0.4, corresponding to ssl from 3.10.7 before 11.2.12.11, from 11.3 before 11.6.0.4, and from 11.7 before 11.7.4. Whether OTP before OTP R13B03, corresponding to ssl before 3.10.7, is affected is unknown.

Other Security Trackers

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail National Vulnerability Database SUSE
Base Score 7.4 7.4
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network Network
Attack Complexity High High
Privileges Required None None
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact High High
Integrity Impact High High
Availability Impact None None
CVSSv3 Version 3.1 3.1
CVSS v4 Scores
CVSS detail CNA (6b3ad84c-e1a6-4bf7-a703-f496b71e49db) SUSE
Base Score 9.1 9.1
Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Attack Vector Network Network
Attack Complexity Low Low
Attack Requirements Present Present
Privileges Required None None
User Interaction None None
Vulnerable System Confidentiality Impact High High
Vulnerable System Integrity Impact High High
Vulnerable System Availability Impact None None
Subsequent System Confidentiality Impact None None
Subsequent System Integrity Impact None None
Subsequent System Availability Impact None None
CVSSv4 Version 4.0 4.0
SUSE Bugzilla entry: 1272911 [IN_PROGRESS]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP4-ESPOS-2026-3645
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP4-LTSS-2026-3645
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-3645
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-3645
SUSE Linux Enterprise High Performance Computing 15 SP7
SUSE Linux Enterprise Module for Server Applications 15 SP7
SUSE Linux Enterprise Server 15 SP7
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
  • erlang26 >= 26.2.1-150300.7.28.1
  • erlang26-epmd >= 26.2.1-150300.7.28.1
 Patchnames:
SUSE-SLE-Module-Server-Applications-15-SP7-2026-3579
SUSE-SLE-Module-Server-Applications-15-SP7-2026-3645
SUSE Linux Enterprise Server 15 SP4-LTSS
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP4-LTSS-2026-3645
SUSE Linux Enterprise Server 15 SP5-LTSS
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-3645
SUSE Linux Enterprise Server 15 SP6-LTSS
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
  • erlang26 >= 26.2.1-150300.7.28.1
  • erlang26-epmd >= 26.2.1-150300.7.28.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-3579
SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-3645
SUSE Linux Enterprise Server for SAP Applications 15 SP4
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP4-2026-3645
SUSE Linux Enterprise Server for SAP Applications 15 SP5
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP5-2026-3645
SUSE Linux Enterprise Server for SAP Applications 15 SP6
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
  • erlang26 >= 26.2.1-150300.7.28.1
  • erlang26-epmd >= 26.2.1-150300.7.28.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP6-2026-3579
SUSE-SLE-Product-SLES_SAP-15-SP6-2026-3645
SUSE Manager Proxy LTS 4.3
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-SUSE-Manager-Proxy-4.3-LTS-2026-3645
SUSE Manager Retail Branch Server LTS 4.3
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-SUSE-Manager-Retail-Branch-Server-4.3-LTS-2026-3645
SUSE Manager Server LTS 4.3
  • erlang >= 23.3.4.19-150300.3.39.1
  • erlang-epmd >= 23.3.4.19-150300.3.39.1
 Patchnames:
SUSE-SLE-Product-SUSE-Manager-Server-4.3-LTS-2026-3645
openSUSE Tumbleweed
  • erlang >= 28.5.0.4-1.1
  • erlang-debugger >= 28.5.0.4-1.1
  • erlang-debugger-src >= 28.5.0.4-1.1
  • erlang-dialyzer >= 28.5.0.4-1.1
  • erlang-dialyzer-src >= 28.5.0.4-1.1
  • erlang-diameter >= 28.5.0.4-1.1
  • erlang-diameter-src >= 28.5.0.4-1.1
  • erlang-doc >= 28.5.0.4-1.1
  • erlang-epmd >= 28.5.0.4-1.1
  • erlang-et >= 28.5.0.4-1.1
  • erlang-et-src >= 28.5.0.4-1.1
  • erlang-jinterface >= 28.5.0.4-1.1
  • erlang-jinterface-src >= 28.5.0.4-1.1
  • erlang-observer >= 28.5.0.4-1.1
  • erlang-observer-src >= 28.5.0.4-1.1
  • erlang-reltool >= 28.5.0.4-1.1
  • erlang-reltool-src >= 28.5.0.4-1.1
  • erlang-src >= 28.5.0.4-1.1
  • erlang-wx >= 28.5.0.4-1.1
  • erlang-wx-src >= 28.5.0.4-1.1
  • erlang27 >= 27.1.3-3.1
  • erlang27-debugger >= 27.1.3-3.1
  • erlang27-debugger-src >= 27.1.3-3.1
  • erlang27-dialyzer >= 27.1.3-3.1
  • erlang27-dialyzer-src >= 27.1.3-3.1
  • erlang27-diameter >= 27.1.3-3.1
  • erlang27-diameter-src >= 27.1.3-3.1
  • erlang27-doc >= 27.1.3-3.1
  • erlang27-epmd >= 27.1.3-3.1
  • erlang27-et >= 27.1.3-3.1
  • erlang27-et-src >= 27.1.3-3.1
  • erlang27-jinterface >= 27.1.3-3.1
  • erlang27-jinterface-src >= 27.1.3-3.1
  • erlang27-observer >= 27.1.3-3.1
  • erlang27-observer-src >= 27.1.3-3.1
  • erlang27-reltool >= 27.1.3-3.1
  • erlang27-reltool-src >= 27.1.3-3.1
  • erlang27-src >= 27.1.3-3.1
  • erlang27-wx >= 27.1.3-3.1
  • erlang27-wx-src >= 27.1.3-3.1
 Patchnames:
openSUSE-Tumbleweed-2026-11559
openSUSE-Tumbleweed-2026-11560

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP7 erlang Released
SUSE Linux Enterprise High Performance Computing 15 SP7 erlang26 Released
SUSE Linux Enterprise Module for Server Applications 15 SP7 erlang Released
SUSE Linux Enterprise Module for Server Applications 15 SP7 erlang26 Released
SUSE Linux Enterprise Server 15 SP7 erlang Released
SUSE Linux Enterprise Server 15 SP7 erlang26 Released
SUSE Linux Enterprise Server 16.0 erlang Affected
SUSE Linux Enterprise Server 16.1 erlang Released
SUSE Linux Enterprise Server for SAP Applications 15 SP7 erlang Released
SUSE Linux Enterprise Server for SAP Applications 15 SP7 erlang26 Released
SUSE Linux Enterprise Server for SAP applications 16.0 erlang Affected
SUSE Linux Enterprise Server for SAP applications 16.1 erlang Released
openSUSE Leap 16.0 erlang Affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS erlang Released
SUSE Linux Enterprise High Performance Computing 15 SP5 erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS erlang Released
SUSE Linux Enterprise Module for Server Applications 15 SP4 erlang Affected
SUSE Linux Enterprise Module for Server Applications 15 SP5 erlang Affected
SUSE Linux Enterprise Module for Server Applications 15 SP6 erlang Affected
SUSE Linux Enterprise Module for Server Applications 15 SP6 erlang26 Affected
SUSE Linux Enterprise Server 15 SP4 erlang Affected
SUSE Linux Enterprise Server 15 SP4-LTSS erlang Released
SUSE Linux Enterprise Server 15 SP5 erlang Affected
SUSE Linux Enterprise Server 15 SP5-LTSS erlang Released
SUSE Linux Enterprise Server 15 SP6 erlang Affected
SUSE Linux Enterprise Server 15 SP6 erlang26 Affected
SUSE Linux Enterprise Server 15 SP6-LTSS erlang Released
SUSE Linux Enterprise Server 15 SP6-LTSS erlang26 Released
SUSE Linux Enterprise Server for SAP Applications 15 SP4 erlang Released
SUSE Linux Enterprise Server for SAP Applications 15 SP5 erlang Released
SUSE Linux Enterprise Server for SAP Applications 15 SP6 erlang Released
SUSE Linux Enterprise Server for SAP Applications 15 SP6 erlang26 Released
SUSE Manager Proxy 4.3 erlang Affected
SUSE Manager Proxy LTS 4.3 erlang Released
SUSE Manager Retail Branch Server 4.3 erlang Affected
SUSE Manager Retail Branch Server LTS 4.3 erlang Released
SUSE Manager Server 4.3 erlang Affected
SUSE Manager Server LTS 4.3 erlang Released
Products past their end of life and not receiving proactive updates anymore.
SUSE Enterprise Storage 7 erlang Affected
SUSE Enterprise Storage 7.1 erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP2 erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP3 erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP4 erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS erlang Released
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS erlang Released
SUSE Linux Enterprise High Performance Computing 15 SP6 erlang Affected
SUSE Linux Enterprise High Performance Computing 15 SP6 erlang26 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP2 erlang Affected
SUSE Linux Enterprise Module for Server Applications 15 SP3 erlang Affected
SUSE Linux Enterprise Real Time 15 SP2 erlang Affected
SUSE Linux Enterprise Real Time 15 SP3 erlang Affected
SUSE Linux Enterprise Real Time 15 SP4 erlang Affected
SUSE Linux Enterprise Server 15 SP2 erlang Affected
SUSE Linux Enterprise Server 15 SP2-BCL erlang Affected
SUSE Linux Enterprise Server 15 SP2-LTSS erlang Affected
SUSE Linux Enterprise Server 15 SP3 erlang Affected
SUSE Linux Enterprise Server 15 SP3-BCL erlang Affected
SUSE Linux Enterprise Server 15 SP3-LTSS erlang Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 erlang Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 erlang Affected
SUSE Manager Proxy 4.1 erlang Affected
SUSE Manager Proxy 4.2 erlang Affected
SUSE Manager Retail Branch Server 4.1 erlang Affected
SUSE Manager Retail Branch Server 4.2 erlang Affected
SUSE Manager Server 4.1 erlang Affected
SUSE Manager Server 4.2 erlang Affected
openSUSE Leap 15.3 erlang Released
openSUSE Leap 15.3 erlang26 Released
openSUSE Leap 15.4 erlang Affected
openSUSE Leap 15.5 erlang Affected
openSUSE Leap 15.6 erlang Affected
openSUSE Leap 15.6 erlang26 Affected

SUSE Timeline for this CVE

CVE page created: Wed Jul 29 21:53:06 2026
CVE page last modified: Fri Aug 21 12:07:39 2026