Vulnerability in Erlang Erlang\/otp
CVE-2026-42790
Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_cert and public_key modules) allows a DNS nameConstraints bypass via subject CommonName fallback in TLS hostname verification. Two flaws combine to allow a sub…
Vulnerability class: Improper Certificate Validation
EPSS: 0.000 (6.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
Affected products
- Erlang Erlang\/otp
- Erlang Otp — versions 1.4, 19.3, b0c245e8132bb13171e277b1af59c0cec00c9459
Weakness classification (CWE)
References
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db (related, vendor-advisory, Vendor Advisory)
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db (related, Third Party Advisory)
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db (related, Third Party Advisory, Mitigation)
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db (Product, x_version-scheme)
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db (Patch, patch)
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db (Patch, patch)
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db (Patch, patch)
Frequently asked questions
- What is CVE-2026-42790?
- CVE-2026-42790 is a high-severity vulnerability in Erlang Erlang\/otp, classified under Improper Certificate Validation. CVSS score: 8.1/10. Published 2026-05-27.
- How severe is CVE-2026-42790?
- High severity. CVSS v3 base score is 8.1 out of 10.