CVE-2026-101003

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.46% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 39.7% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-01.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-28 05:30Z1 MO AGO

Last updated

2026-10-01 14:06Z28 DAYS AGO

Reserved

2026-09-27

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-121Stack-based Buffer OverflowVariant
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

64585a58cb1699daf6e5b62591a4d0defdaeba191df210c170f9ac77d6b36c74

• vuldb.comVDB-410873 | Cesanta Mongoose MQTT Broker main.c fn stack-based overflowhttps://vuldb.com/vuln/410873vdb-entrytechnical-description
• vuldb.comVDB-410873 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/410873/ctisignaturepermissions-required
• vuldb.comCVE-2026-101003 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-101003third-party-advisory
• vuldb.comSubmit #920005 | Cesanta Mongoose 7.20 Stack Buffer Overflowhttps://vuldb.com/submit/920005third-party-advisory
• github.comhttps://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71patch
• github.comhttps://github.com/cesanta/mongoose/releases/tag/7.22patch
• github.comhttps://github.com/cesanta/mongoose/product