Vulnerability · Published Sep 13, 2026 · Assigned by VulnCheck

CVE-2026-90779SIPp through 3.7.7 Stack Buffer Overflow via createAuthHeader Algorithm Parameter

High 7.5

In plain English

A high-severity stack buffer overflow in sipp from SIPp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.8%top 43.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
SIPp	sipp	0 – through 3.7.7

Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Pull Request #880 patch, issue-tracking
Patch Commit patch
Unbounded strncpy into algo[32] in createAuthHeader() at v3.7.7 technical-description
https://github.com/SIPp/sipp product
VulnCheck Advisory: SIPp through 3.7.7 Stack Buffer Overflow via createAuthHeader Algorithm Parameter third-party-advisory