Upstream information
Description
Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows OCSP designated-responder authorization bypass via missing signature verification.The OCSP response validation in public_key:pkix_ocsp_validate/5 does not verify that a CA-designated responder certificate was cryptographically signed by the issuing CA. Instead, it only checks that the responder certificate's issuer name matches the CA's subject name and that the certificate has the OCSPSigning extended key usage. An attacker who can intercept or control OCSP responses can create a self-signed certificate with a matching issuer name and the OCSPSigning EKU, and use it to forge OCSP responses that mark revoked certificates as valid.
This affects SSL/TLS clients using OCSP stapling, which may accept connections to servers with revoked certificates, potentially transmitting sensitive data to compromised servers. Applications using the public_key:pkix_ocsp_validate/5 API directly are also affected, with impact depending on usage context.
This vulnerability is associated with program files lib/public_key/src/pubkey_ocsp.erl and program routines pubkey_ocsp:is_authorized_responder/3.
This issue affects OTP from OTP 27.0 until OTP 28.4.2 and 27.3.4.10 corresponding to public_key from 1.16 until 1.20.3 and 1.17.1.2, and ssl from 11.2 until 11.5.4 and 11.2.12.7.
SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having important severity.
| CVSS detail | SUSE |
|---|---|
| Base Score | 8.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality Impact | High |
| Integrity Impact | High |
| Availability Impact | None |
| CVSSv3 Version | 3.1 |
| CVSS detail | CNA (6b3ad84c-e1a6-4bf7-a703-f496b71e49db) | SUSE |
|---|---|---|
| Base Score | 7.6 | 7.6 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/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:P/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 | Passive | Passive |
| Vulnerable System Confidentiality Impact | High | High |
| Vulnerable System Integrity Impact | High | High |
| Vulnerable System Availability Impact | None | None |
| Subsequent System Confidentiality Impact | Low | None |
| Subsequent System Integrity Impact | Low | None |
| Subsequent System Availability Impact | None | None |
| CVSSv4 Version | 4.0 | 4.0 |
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 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | erlang26 | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | erlang | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | erlang26 | Not affected |
| SUSE Linux Enterprise Server 15 SP7 | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP7 | erlang26 | Not affected |
| SUSE Linux Enterprise Server 16.1 | erlang | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | erlang | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | erlang26 | Not affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | erlang | Affected |
| openSUSE Leap 15.6 | erlang | Not affected |
| openSUSE Leap 15.6 | erlang26 | Not affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP4 | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | erlang | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP4 | erlang | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP5 | erlang | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP6 | erlang | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP6 | erlang26 | Not affected |
| SUSE Linux Enterprise Server 15 SP4 | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP5 | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | erlang26 | Not affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | erlang26 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | erlang | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | erlang26 | Not affected |
| SUSE Manager Proxy 4.3 | erlang | Not affected |
| SUSE Manager Proxy LTS 4.3 | erlang | Not affected |
| SUSE Manager Retail Branch Server 4.3 | erlang | Not affected |
| SUSE Manager Retail Branch Server LTS 4.3 | erlang | Not affected |
| SUSE Manager Server 4.3 | erlang | Not affected |
| SUSE Manager Server LTS 4.3 | erlang | Not affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Enterprise Storage 7 | erlang | Not affected |
| SUSE Enterprise Storage 7.1 | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | erlang | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | erlang26 | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | erlang | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP3 | erlang | Not affected |
| SUSE Linux Enterprise Real Time 15 SP2 | erlang | Not affected |
| SUSE Linux Enterprise Real Time 15 SP3 | erlang | Not affected |
| SUSE Linux Enterprise Real Time 15 SP4 | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP2 | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP3 | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | erlang | Not affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | erlang | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | erlang | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | erlang | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | erlang | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | erlang | Not affected |
| SUSE Manager Proxy 4.1 | erlang | Not affected |
| SUSE Manager Proxy 4.2 | erlang | Not affected |
| SUSE Manager Retail Branch Server 4.1 | erlang | Not affected |
| SUSE Manager Retail Branch Server 4.2 | erlang | Not affected |
| SUSE Manager Server 4.1 | erlang | Not affected |
| SUSE Manager Server 4.2 | erlang | Not affected |
| openSUSE Leap 15.3 | erlang | Not affected |
| openSUSE Leap 15.4 | erlang | Not affected |
| openSUSE Leap 15.5 | erlang | Not affected |
SUSE Timeline for this CVE
CVE page created: Tue Apr 7 16:20:35 2026CVE page last modified: Wed Apr 8 19:49:11 2026