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Vulnerability record · CVE-2026-90778 · published 13 September 2026

CVE-2026-90778: Classic buffer overflow vulnerability

SIPp through 3.7.7 contains a buffer overflow vulnerability in get_peer_tag() function when processing SIP To headers with tag parameters of 2049 bytes or more. Unauthenticated remote attackers can send crafted SIP messages with oversized tag parameters to overflow the static buffer and crash the process.

8.7 CVSS 4.0 High EPSS 0.86% · top 43.2% CWE-120 · Classic buffer overflow Deferred
8.7CVSS 4.0 base score
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
23 Sep 2026Last modified by NVD

Description

SIPp through 3.7.7 contains a buffer overflow vulnerability in get_peer_tag() function when processing SIP To headers with tag parameters of 2049 bytes or more. Unauthenticated remote attackers can send crafted SIP messages with oversized tag parameters to overflow the static buffer and crash the process.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/SIPp/sipp
https://github.com/SIPp/sipp/blob/v3.7.7/src/sip_parser.cpp#L76-L113
https://github.com/SIPp/sipp/commit/ddf22d1a54e0396b2e18ebaf4cf5a3fa860e5da4
https://github.com/SIPp/sipp/pull/879
https://www.vulncheck.com/advisories/sipp-through-3.7.7-buffer-overflow-via-sip-to-header-tag

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Source: NIST National Vulnerability Database (record CVE-2026-90778), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.