OCSP designated-responder authorization bypass via missing signature verification
Summary
| CVE | CVE-2026-32144 |
|---|---|
| State | PUBLISHED |
| Assigner | EEF |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-07 13:16:46 UTC |
| Updated | 2026-07-15 02:19:52 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 7.6 HIGH from 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
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
Problem Types: CWE-295 | CWE-347 | CWE-295 CWE-295 Improper Certificate Validation | CWE-347 Improper Verification of Cryptographic Signature
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | Secondary | 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/C... |
| 4.0 | CNA | CVSS | 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 |
| 3.1 | [email protected] | Primary | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | ADP | CVSS | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
CVSS v4.0 Breakdown
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 v3.1 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Erlang | Erlang/otp | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Erlang | OTP | affected 1.16 * otp | Not specified |
| CNA | Erlang | OTP | affected 11.2 * otp | Not specified |
| CNA | Erlang | OTP | affected 27.0 * otp | Not specified |
| CNA | Erlang | OTP | affected 601a012837ea0a5c8095bf24223132824177124d * git | Not specified |
| ADP | Red Hat | Red Hat OpenStack Platform 16.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenStack Platform 17.1 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenStack Platform 18.0 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/security/cve/CVE-2026-32144 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| github.com/erlang/otp/commit/ac7ff528be857c5d35eb29c7f24106e3a16d4891 | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | github.com | Patch |
| github.com/erlang/otp/commit/49033a6d93a5be0ee0dce04e1fb8b4ae7de1e0c0 | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | github.com | Patch |
| www.erlang.org/doc/system/versions.html | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | www.erlang.org | Vendor Advisory |
| cna.erlef.org/cves/CVE-2026-32144.html | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | cna.erlef.org | Mitigation, Vendor Advisory |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32144.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| osv.dev/vulnerability/EEF-CVE-2026-32144 | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | osv.dev | Third Party Advisory |
| github.com/erlang/otp/security/advisories/GHSA-gxrm-pf64-99xm | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | github.com | Mitigation, Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Igor Morgenstern / Aisle Research (en)
CNA: Jakub Witczak (en)
CNA: Ingela Anderton Andin (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-04-07T13:00:56.836Z | Reported to Red Hat. |
| ADP | 2026-04-07T12:28:00.767Z | Made public. |
Workarounds
CNA: For SSL users: * Do not enable OCSP validation setting (current default is {stapling, no_staple}) * Use CRL-based revocation checking by setting the {crl_check, true} SSL option instead For applications using public_key:pkix_ocsp_validate/5 directly: * Pass {is_trusted_responder_fun, Fun} option with a function that validates trusted responder certificates * Restrict OCSP responder access to trusted endpoints via network controls (only applicable if you control the OCSP infrastructure)
ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.