---
title: "CVE-2026-84975: PJSIP - Authentication Bypass"
description: "PJSIP <= 2.17 contains a server impersonation vulnerability caused by improper handling of DNS SubjectAltName with embedded NUL bytes in OpenSSL and GnuTLS backends, letting attackers with a trusted certificate and interception capability impersonate servers, exploit requires attacker to intercept connection and possess a trusted certificate."
url: https://panop.io/threat-heartbeat/CVE-2026-84975/
---

# CVE-2026-84975 PJSIP - Authentication Bypass

PJSIP <= 2.17 contains a server impersonation vulnerability caused by improper handling of DNS SubjectAltName with embedded NUL bytes in OpenSSL and GnuTLS backends, letting attackers with a trusted certificate and interception capability impersonate servers, exploit requires attacker to intercept connection and possess a trusted certificate.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.23% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-84975)

## Details

Type

Authentication Bypass

Impact

Broken Authentication, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

18 September 2026

Updated

15 October 2026

Weakness

[CWE-295](https://cwe.mitre.org/data/definitions/295.html)

## Vendor fix

Update to a version that properly handles DNS SubjectAltName or apply patches when available.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-84975](https://nvd.nist.gov/vuln/detail/CVE-2026-84975)
- [https://github.com/pjsip/pjproject/commit/43d3bd77bb6833eab4c493503b8d564a754ddfdd](https://github.com/pjsip/pjproject/commit/43d3bd77bb6833eab4c493503b8d564a754ddfdd)
- [https://github.com/pjsip/pjproject/security/advisories/GHSA-382p-87mh-r3q8](https://github.com/pjsip/pjproject/security/advisories/GHSA-382p-87mh-r3q8)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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