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Otp EUVDEUVD-2026-19604

| CVE-2026-32144 HIGH
Improper Certificate Validation (CWE-295)
2026-04-07 EEF
Information Disclosure Otp
7.6
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
7.6 HIGH
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
SUSE
8.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Red Hat
7.4 HIGH
qualitative

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

5
Re-analysis Queued
Apr 23, 2026 - 17:57 vuln.today
cvss_changed
EUVD ID Assigned
Apr 07, 2026 - 12:45 euvd
EUVD-2026-19604
Analysis Generated
Apr 07, 2026 - 12:45 vuln.today
Patch released
Apr 07, 2026 - 12:45 nvd
Patch available
CVE Published
Apr 07, 2026 - 12:28 nvd
HIGH 7.6

DescriptionCVE.org

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.

AnalysisAI

Erlang OTP public_key module (versions 1.16 through 1.20.3 and 1.17.1.2) fails to cryptographically verify OCSP responder certificate signatures, allowing network attackers to forge OCSP responses with self-signed certificates bearing matching issuer names and OCSPSigning extended key usage. This bypasses certificate revocation checks in SSL/TLS clients using OCSP stapling, enabling man-in-the-middle attackers to present revoked certificates as valid and intercept sensitive communications. Vendo

Technical ContextAI

OCSP (Online Certificate Status Protocol, RFC 6960) allows SSL/TLS clients to verify certificate revocation status in real-time. The Erlang OTP public_key library implements OCSP validation in the pubkey_ocsp module, specifically the pkix_ocsp_validate/5 function and is_authorized_responder/3 routine. CWE-295 (Improper Certificate Validation) manifests here as missing cryptographic signature verification on designated responder certificates. RFC 6960 section 4.2.2.2 requires that designated responders hold certificates issued by the CA whose certificates they validate, verified through signature chains. The vulnerable code path (lib/public_key/src/pubkey_ocsp.erl) performs only nominal checks-verifying the responder certificate's issuer DN matches the CA's subject DN and contains the id-kp-OCSPSigning EKU (1.3.6.1.5.5.7.3.9)-without validating the CA's cryptographic signature on that certificate. This allows attackers with network interception capability to craft self-signed certificates with arbitrary issuer fields and the required EKU, transforming OCSP from a security control into a false-trust signal. Affects Erlang OTP 27.0 through 28.4.2 and 27.3.4.10 (public_key 1.16-1.20.3 and 1.17.1.2; ssl 11.2-11.5.4 and 11.2.12.7 per CPE data).

RemediationAI

Upgrade Erlang OTP to patched versions 28.4.2 or later (28.x branch) or 27.3.4.10 or later (27.x branch), which include public_key 1.20.3/1.17.1.2 and ssl 11.5.4/11.2.12.7 with corrected signature verification logic. Patches are documented in commits https://github.com/erlang/otp/commit/ac7ff528be857c5d35eb29c7f24106e3a16d4891 and https://github.com/erlang/otp/commit/49033a6d93a5be0ee0dce04e1fb8b4ae7de1e0c0. Organizations unable to upgrade immediately should review applications for direct use of public_key:pkix_ocsp_validate/5 and consider disabling OCSP stapling in SSL/TLS clients, accepting the tradeoff of degraded revocation checking rather than bypassable validation. Implement network monitoring for anomalous OCSP responses or certificate usage patterns as compensating detective control. Consult https://www.erlang.org/doc/system/versions.html for version ordering guidance when applying patches across OTP branches.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed

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EUVD-2026-19604 vulnerability details – vuln.today
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