CVE-2026-8836

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 ImpacttotalSuccessful exploitation gives total 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

1.09% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 65.3% of scored records. A rank, not a probability.

NVD base score

8.9 (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:H/VI:H/VA:H/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 2026-08-22.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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

2026-05-18 18:45Z5 MO AGO

Last updated

2026-08-22 08:42Z2 MO AGO

Reserved

2026-05-18

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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

Data version

5.2

Document digest

7d5a9d3e698ea8291a0c9e5517d9b8eaf4e6a31e0279892e83ecec6fa13417df

• vuldb.comVDB-364474 | lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflowhttps://vuldb.com/vuln/364474vdb-entrytechnical-description
• vuldb.comVDB-364474 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/364474/ctisignaturepermissions-required
• vuldb.comCVE-2026-8836 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-8836third-party-advisory
• vuldb.comSubmit #829798 | lwIP 2.1.0 Stack-based Buffer Overflowhttps://vuldb.com/submit/829798third-party-advisory
• savannah.nongnu.orghttps://savannah.nongnu.org/bugs/?68055broken-link
• cgit.git.savannah.gnu.orghttps://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898cbroken-linkpatch
• github.comhttps://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898cpatch
• savannah.nongnu.orghttps://savannah.nongnu.org/bugs/?68194broken-link