# CVE-2026-90780: SIPp buffer overflow in get_header function

Source: https://junglewise.ai/threats/cve-2026-90780-sipp-buffer-overflow-in-get-header-function  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-13. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-90780 · Severity: high · CVSS 7.5 · Published 2026-09-13

SIPp is a widely-used open-source SIP (Session Initiation Protocol) testing and traffic generation tool. An unauthenticated remote attacker can send a specially crafted SIP message with oversized header content to crash the SIPp process, causing a denial of service to any systems relying on SIPp for call simulation or testing.

Technologies: [SIPp](https://junglewise.ai/threats/technologies/sipp). Vendors: [SIPp](https://junglewise.ai/threats/vendors/sipp).

## Quick answers

**Is CVE-2026-90780 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90780 being exploited in the wild.

**How severe is CVE-2026-90780?** High severity, with a CVSS score of 7.5, published 13 September 2026.

**Which products and versions are affected?** SIPp through 3.7.7.

**Is there a fix for CVE-2026-90780?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-90780 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-90780?** Check whether you run SIPp at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in the get_header() function in src/sip_parser.cpp when processing SIP messages with headers exceeding 20,490 bytes. The vulnerable code uses a fixed-size static buffer without proper bounds checking. An unauthenticated remote attacker on the network can send a crafted SIP message with an oversized header to overflow this buffer, crashing the SIPp process. This is a network-reachable, pre-authentication vulnerability; no user interaction or authentication is required. The primary impact is denial of service through process termination.

## Affected products

- SIPp SIPp through 3.7.7

## Timeline

- 2026-09-13: disclosed

## References

- [https://github.com/SIPp/sipp](https://github.com/SIPp/sipp)
- [https://github.com/SIPp/sipp/blob/v3.7.7/src/sip_parser.cpp](https://github.com/SIPp/sipp/blob/v3.7.7/src/sip_parser.cpp)

## Related threats

- [SIPp stack buffer overflow in createAuthHeader()](https://junglewise.ai/threats/cve-2026-90779-sipp-stack-buffer-overflow-in-createauthheader)
- [SIPp buffer overflow in get_peer_tag() function](https://junglewise.ai/threats/cve-2026-90778-sipp-buffer-overflow-in-get-peer-tag-function)
- [SIPp buffer overflow in command-line argument handling](https://junglewise.ai/threats/cve-2018-25356-sipp-buffer-overflow-in-command-line-argument-handling)