What’s Vulnerable › Vulnerabilities

CVE-2026-23747: Golioth Firmware SDK < 0.22.0 Payload Utils Stack-based Buffer Overflow

• 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-121

Description

Golioth Firmware SDK version 0.10.0 prior to 0.22.0, fixed in commit 48f521b, contain a stack-based buffer overflow in Payload Utils. The golioth_payload_as_int() and golioth_payload_as_float() helpers copy network-supplied payload data into fixed-size stack buffers using memcpy() with a length derived from payload_size. The only length checks are guarded by assert(); in release builds, the asserts are compiled out and memcpy() may copy an unbounded payload_size. Payloads larger than 12 bytes (int) or 32 bytes (float) can overflow the stack, resulting in a crash/denial of service. This is reachable via LightDB State on_payload with a malicious server or MITM.

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/48f521bcc0187ada2b9cbdad31dc380e6c7b7332
• https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0
• https://secmate.dev/disclosures/SECMATE-2025-0015
• https://www.vulncheck.com/advisories/golioth-firmware-sdk-payload-utils-stack-based-buffer-overflow

Get alerted when CVE-2026-23747 or the next vulnerability affects your stack