High severity · published Sep 13, 2026
CVE-2026-90779
SIPp through 3.7.7 Stack Buffer Overflow via createAuthHeader Algorithm Parameter
7.5
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
sipp · SIPp
through 3.7.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90779
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90779
github.com
https://github.com/SIPp/sipp
github.com
https://github.com/SIPp/sipp/blob/v3.7.7/src/auth.cpp#L183-L192
github.com
https://github.com/SIPp/sipp/commit/1d4a5622bea34d0b5cdff333e6b5734608e30af7
github.com
https://github.com/SIPp/sipp/pull/880
www.vulncheck.com
https://www.vulncheck.com/advisories/sipp-through-3.7.7-stack-buffer-overflow-via-createauthheader-algorithm-parameter
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