7.6

CVE-2026-32144: erlang erlang\/otp Improper Certificate Validation

CVSS: 7.6v4.0HighModified
AliasesUBUNTU-CVE-2026-32144DEBIAN-CVE-2026-32144
Published 07-04-2026Last modified 24-07-2026
Open JSON

Vulnerability summary

CVE-2026-32144 is a high (CVSS 7.6) Improper Certificate Validation vulnerability in erlang erlang\/otp. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 22.9% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.6/10
010
High · v4.0 (CVE.org)
EPSS score
0.32%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
OPENSUSE-SU-2026:10947-1OPENSUSE-SU-2026:20607-1USN-8901-1

Timeline

  1. 07-04-2026
    PublishedVulnerability first disclosed.
  2. 24-07-2026
    Last modifiedVulnerability information updated.

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 before OTP 28.4.2 and OTP 27.3.4.10, corresponding to public_key from 1.16 before 1.20.3 and 1.17.1.2, and ssl from 11.2 before 11.5.4 and 11.2.12.7.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

+0.11 pp

From 0.20% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.32%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Erlang4 products
  • erlang\/otp≥ 27.0, < 27.3.4.10 | ≥ 28.0, < 28.4.2
  • erlang\/public_key≥ 1.16, < 1.17.1.2 | ≥ 1.18, < 1.20.3
  • erlang\/ssl≥ 11.2, < 11.2.12.7 | > 11.3, < 11.5.4
  • otp≥ 1.16 (No fix recorded) | ≥ 11.2 (No fix recorded) | ≥ 27.0 (No fix recorded) | ≥ 601a012837ea0a5c8095bf24223132824177124d (No fix recorded)
Debian1 product
  • erlang< 1:27.3.4.1+dfsg-1+deb13u3 | < 1:27.3.4.10+dfsg-1
Ubuntu1 product
  • erlangAll versions (No fix recorded) | < 1:27.3.4.6+dfsg-1ubuntu0.2

3 vendors · 6 products

References

14 links
Show all 14 references