Vulnerability · Published Feb 26, 2026 · Assigned by VulnCheck

CVE-2026-23748Golioth Firmware SDK < 0.22.0 LightDB State Out-of-Bounds Read

Low 3.7

In plain English

A low-severity security flaw in Firmware SDK from Golioth. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)3.7Low

Exploit odds (30 days)0.3%top 76.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Golioth Firmware SDK version 0.10.0 prior to 0.22.0, fixed in commit d7f55b38, contain an out-of-bounds read in LightDB State string parsing. When processing a string payload, a payload_size value less than 2 can cause a size_t underflow when computing the number of bytes to copy (nbytes). The subsequent memcpy() reads past the end of the network buffer, which can crash the device. The condition is reachable from on_payload, and golioth_payload_is_null() does not block payload_size==1. A malicious server or MITM can trigger a denial of service.

Affected products (as reported)

Vendor	Product	Versions
Golioth	Firmware SDK	0.10.0 – before 0.22.0

Weakness: CWE-191 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References

https://secmate.dev/disclosures/SECMATE-2025-0016 technical-description
https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/ technical-description, exploit
https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0 release-notes
https://github.com/golioth/golioth-firmware-sdk/commit/d7f55b380d8be8b29bd101ce06e421af2e88c12b patch
https://www.vulncheck.com/advisories/golioth-firmware-sdk-lightdb-state-out-of-bounds-read third-party-advisory