{"id":"CVE-2026-23747","title":"Golioth Firmware SDK < 0.22.0 Payload Utils Stack-based Buffer Overflow","summary":"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 …","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-121"],"vendor":"Golioth","product":"Firmware SDK","affected":["firmware_sdk >= 0.10.0 < 0.22.0"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-02-27T16:07:17.351702Z"},"exploitAvailable":true,"published":"2026-02-26","updated":"2026-11-08","sourceUpdated":"2026-11-08T14:01:23.555Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23747","references":[{"url":"https://secmate.dev/disclosures/SECMATE-2025-0015"},{"url":"https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/"},{"url":"https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0","label":"Firmware SDK 0.22.0 Release Notes"},{"url":"https://github.com/golioth/golioth-firmware-sdk/commit/48f521bcc0187ada2b9cbdad31dc380e6c7b7332"},{"url":"https://www.vulncheck.com/advisories/golioth-firmware-sdk-payload-utils-stack-based-buffer-overflow"}],"tags":["cve.org","exploit-available"],"epss":0.0034,"epssPercentile":0.27707,"ingestedAt":"2026-11-08T14:51:22.473Z","slug":"CVE-2026-23747","body":"## Overview\n\nGolioth 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.\n\n## Affected\n\n- `firmware_sdk >= 0.10.0 < 0.22.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":32,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}