CVE-2026-90780: Buffer Overflow (CVSS 7.5)

Description

SIPp through 3.7.7 contains a buffer overflow vulnerability in the get_header() function in src/sip_parser.cpp when processing SIP messages with header content exceeding 20,490 bytes. Unauthenticated remote attackers can send crafted SIP messages with oversized headers to overflow the static buffer and crash the process.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0063

Probability of exploitation

0.49%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-120 CWE-120

References

Other References

https://github.com/SIPp/sipp https://github.com/SIPp/sipp/blob/v3.7.7/src/sip_parser.cpp#L164-L227 https://github.com/SIPp/sipp/commit/8ddfb43359703e665041a955543e07f504f80232 https://github.com/SIPp/sipp/pull/881 https://www.vulncheck.com/advisories/sipp-through-3.7.7-buffer-overflow-via-oversized-sip-header-content

Frequently Asked Questions

What is CVE-2026-90780? +

SIPp through 3.7.7 contains a buffer overflow vulnerability in the get_header() function in src/sip_parser.cpp when processing SIP messages with header content exceeding 20,490 bytes. Unauthenticated remote attackers can send crafted SIP messages with oversized headers to overflow the static buffer and crash the process. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-90780? +

CVE-2026-90780 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0063, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-90780? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-90780