---
id: CVE-2026-90779
title: >-
  SIPp through 3.7.7 contains a stack buffer overflow vulnerability in
  createAuthHeader() when processing SIP authentication challenges with
  oversized algorithm parameters
summary: >-
  SIPp through 3.7.7 contains a stack buffer overflow vulnerability in
  createAuthHeader() when processing SIP authentication challenges with
  oversized algorithm parameters. A malicious SIP server can send a crafted 401
  or 407 challenge to …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-121
vendor: Red Hat
product: sipp
affected:
  - sipp <= 3.7.7
published: '2026-09-13'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:44.380'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90779'
references:
  - url: 'https://github.com/SIPp/sipp'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/SIPp/sipp/blob/v3.7.7/src/auth.cpp#L183-L192'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/SIPp/sipp/commit/1d4a5622bea34d0b5cdff333e6b5734608e30af7
    label: disclosure@vulncheck.com
  - url: 'https://github.com/SIPp/sipp/pull/880'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/sipp-through-3.7.7-stack-buffer-overflow-via-createauthheader-algorithm-parameter
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90779.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-90779'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-90779'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00565
epssPercentile: 0.45706
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-14T15:33:55.105739Z'
ingestedAt: '2026-09-14T15:23:07.470Z'
---

## Overview

SIPp through 3.7.7 contains a stack buffer overflow vulnerability in createAuthHeader() when processing SIP authentication challenges with oversized algorithm parameters. A malicious SIP server can send a crafted 401 or 407 challenge to corrupt the stack and crash the client process.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90779.json)