Erlang OTP up to 28.4.2 Self-Signed Certificate pubkey_ocsp.erl certificate validation

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Erlang OTP up to 28.4.2. It has been classified as critical. This affects an unknown part in the library lib/public_key/src/pubkey_ocsp.erl of the component Self-Signed Certificate Handler. Performing a manipulation results in certificate validation. This vulnerability is identified as CVE-2026-32144. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Erlang OTP up to 28.4.2. It has been classified as problematic. This affects an unknown code block in the library lib/public_key/src/pubkey_ocsp.erl of the component Self-Signed Certificate Handler. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-32144 since 03/10/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 305687 (Erlang/OTP 27.x < 27.3.4.10 / 28.x < 28.4.2 OCSP Certificate Validation Bypass (CVE-2026-32144)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (305687) and CERT Bund (WID-SEC-2026-0998). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • SUSE openSUSE
  • Microsoft Azure Linux
  • Open Source Erlang/OTP

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.2

VulDB Base Score: 3.1
VulDB Temp Score: 3.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.4
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 305687
Nessus Name: Erlang/OTP 27.x < 27.3.4.10 / 28.x < 28.4.2 OCSP Certificate Validation Bypass (CVE-2026-32144)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/10/2026 CVE reserved
04/07/2026 +27 days Advisory disclosed
04/07/2026 +0 days VulDB entry created
07/02/2026 +86 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-32144 (🔒)
GCVE (CVE): GCVE-0-2026-32144
GCVE (VulDB): GCVE-100-355731
CERT Bund: WID-SEC-2026-0998 - Erlang/OTP: Mehrere Schwachstellen

Entryinfo

Created: 04/07/2026 15:16
Updated: 07/02/2026 03:04
Changes: 04/07/2026 15:16 (66), 04/08/2026 13:12 (7), 04/13/2026 01:34 (2), 04/23/2026 13:03 (1), 07/02/2026 03:04 (11)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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