What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-26 · updated 2026-07-14
• Weakness: CWE-191

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

• Golioth Firmware SDK: from 0.10.0 before 0.22.0 — fixed in 0.22.0

How to fix

Upgrade to a fixed version: Golioth Firmware SDK 0.22.0. Check the vendor advisory for mitigations.

References

• https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/
• https://github.com/golioth/golioth-firmware-sdk/commit/d7f55b380d8be8b29bd101ce06e421af2e88c12b
• https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0
• https://secmate.dev/disclosures/SECMATE-2025-0016
• https://www.vulncheck.com/advisories/golioth-firmware-sdk-lightdb-state-out-of-bounds-read

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