Stack Buffer Overflow in SIPp Affects Authentication Processing
CVE-2026-90779

8.7HIGH

Key Information:

Vendor

Sipp

Status
Sipp
Vendor
CVE Published:
13 September 2026

What is CVE-2026-90779?

SIPp version 3.7.7 is vulnerable to a stack buffer overflow due to improper handling of oversized algorithm parameters in the createAuthHeader() function. When a compromised SIP server sends a specially crafted 401 or 407 authentication challenge, it can exploit this weakness to corrupt the stack, potentially leading to process crashes. This vulnerability underscores the need for careful input validation when processing SIP authentication challenges.

Affected Version(s)

sipp 0 <= 3.7.7

References

https://github.com/SIPp/sipp/pull/880
patchissue-tracking
https://github.com/SIPp/sipp/commit/1d4a5622bea34d0b5cdff...
patch
https://github.com/SIPp/sipp/blob/v3.7.7/src/auth.cpp#L18...
technical-description

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Tristan Madani
.