CVE-2026-23747Public exploitNetwork attack vector

Device crash via assert-guarded payload copy

Published Feb 26, 2026 · Updated Feb 26, 2026

Stack buffer overflow in Payload Utils in Golioth Firmware SDK before 0.22.0 allows attackers to crash devices via LightDB State. The integer and float helpers copy payload_size bytes into 12- and 32-byte stack arrays after checking the length only with assert(), which release builds omit. Reachability requires a release build and a crafted response from a malicious server or a man-in-the-middle position; the bounded reported consequence is a device crash.

CVSS severity6.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Payload Utils in Golioth Firmware SDK before 0.22.0 allows attackers to crash devices via LightDB State. The integer and float helpers copy payload_size bytes into 12- and 32-byte stack arrays after checking the length only with assert(), which release builds omit. Reachability requires a release build and a crafted response from a malicious server or a man-in-the-middle position; the bounded reported consequence is a device crash.

The record

CVE
CVE-2026-23747
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
Golioth
Product
Golioth Firmware SDK
Classifications
CWE-121, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.10.0 <0.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Golioth · Golioth Firmware SDKversion=0.10.0 <0.22.0

Published CVSS scores

6.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
3.7VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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