CVE-2026-2967

LOW 3.7

Cesanta Mongoose TCP Sequence Number net_builtin.c getpeer verification of source

CVSS Score

3.7

EPSS Score

0.0%

EPSS Percentile

0th

A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This affects the function getpeer of the file /src/net_builtin.c of the component TCP Sequence Number Handler. The manipulation leads to improper verification of source of a communication channel. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is reported as difficult. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CWE	CWE-940
Vendor	cesanta
Product	mongoose
Published	Feb 23, 2026
Last Updated	Feb 23, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Cesanta / Mongoose

7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 7.13 7.14 7.15 7.16 7.17 7.18 7.19 7.20

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/?id.347334 vuldb.com: https://vuldb.com/?ctiid.347334 vuldb.com: https://vuldb.com/?submit.755450 github.com: https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md github.com: https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md#poc

Credits

🔍 dwbruijn (VulDB User)