What is CVE-2026-90779?

CVE-2026-90779 is a high-severity vulnerability in Sipp, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-09-13.

How severe is CVE-2026-90779?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Sipp

CVE-2026-90779

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.

Vulnerability class: Buffer Overflow

Published 2026-09-13 · last modified 2026-09-23.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.5th percentile), scored 2026-10-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Sipp

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

github.com/SIPp/sipp/pull/880 (issue-tracking, patch)
github.com/SIPp/sipp/commit/1d4a5622bea34d0b5cdff333e6b5734608e30af7 (patch)
github.com/SIPp/sipp/blob/v3.7.7/src/auth.cpp (technical-description)
github.com/SIPp/sipp (product)
www.vulncheck.com/advisories/sipp-through-3.7.7-stack-buffer-overflow-via-creat… (third-party-advisory)

Frequently asked questions

What is CVE-2026-90779?: CVE-2026-90779 is a high-severity vulnerability in Sipp, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-09-13.
How severe is CVE-2026-90779?: High severity. CVSS v3 base score is 7.5 out of 10.