CVE-2026-90779
Received Received - Intake

Stack Buffer Overflow in SIPp Due to Oversized Algorithm Parameter

Publication date: 2026-09-13

Last updated on: 2026-09-13

Assigner: VulnCheck

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.

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Meta Information

Published
2026-09-13
Last Modified
2026-09-13
Generated
2026-09-13
AI Q&A
2026-09-13
EPSS Evaluated
N/A
NVD
CVE-2026-90779
EUVD
EUVD-2026-77003

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
sipp sipp to 3.7.7 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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Executive Summary

CVE-2026-90779 is a stack buffer overflow in SIPp through version 3.7.7. It occurs in the createAuthHeader() function when processing SIP authentication challenges with oversized algorithm parameters. A malicious SIP server can send a crafted 401 or 407 response to overflow a 32-byte stack buffer and crash the client process.

Detection Guidance

To detect this vulnerability, check if your SIPp version is 3.7.7 or earlier. Run `sipp -v` to display the version. If vulnerable, monitor for crashes when processing SIP authentication challenges with long algorithm parameters.

Impact Analysis

This vulnerability allows a remote attacker to crash the SIPp client by sending a specially crafted SIP authentication challenge. This could lead to denial of service, disrupting VoIP services or SIP-based applications relying on SIPp for testing or operations.

Compliance Impact

This vulnerability could impact compliance with standards like GDPR and HIPAA by potentially allowing unauthorized access or data breaches if exploited. A stack buffer overflow in SIPp may lead to process crashes or arbitrary code execution, compromising the integrity and confidentiality of SIP communications. This could violate data protection requirements under GDPR (e.g., Article 32 on security of processing) and HIPAA (e.g., Security Rule safeguards for integrity and availability).

Mitigation Strategies

Update SIPp to a patched version beyond 3.7.7. If updating is not possible, restrict network access to SIPp instances or filter malicious SIP responses with oversized algorithm parameters at the network perimeter.

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