Vulnerability · CVE-2026-2967
A security vulnerability has been detected in Cesanta Mongoose up to 7.20.
Published Feb 23, 2026 · catalog updated Jun 17, 2026 · A security vulnerability has
Check if you run it
No confirmed exploitation is on record for CVE-2026-2967. EPSS is 0.72%. Act only if a listed version of A security vulnerability has is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (A security vulnerability has).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Low2.9
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.72%
- Remediation
- Advisory link
- Affected products
- cpe cesanta/mongoose
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe cesanta/mongooseversion unspecified
How to fix CVE-2026-2967
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-2967. EPSS is 0.72%. Act only if a listed version of A security vulnerability has is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-940. EPSS 0.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Feb 23, 2026 · NIST NVD
Detected
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
Jun 17, 2026 · NIST NVD
Updated
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
Sources
- CVE.orgVulnerability recordCVE-2026-2967
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-2967
30-day exploitation probability 0.7%
first.org - NIST NVDVulnerability recordCVE-2026-2967
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 atta
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.