What’s Vulnerable › Vulnerabilities

CVE-2026-23749: Golioth Firmware SDK < 0.22.0 Blockwise Transfer Path Out-of-Bounds Read

• Severity: low (CVSS 2.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% 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-170

Description

Golioth Firmware SDK version 0.19.1 prior to 0.22.0, fixed in commit 0e788217, contain an out-of-bounds read due to improper null termination of a blockwise transfer path. blockwise_transfer_init() accepts a path whose length equals CONFIG_GOLIOTH_COAP_MAX_PATH_LEN and copies it using strncpy() without guaranteeing a trailing NUL byte, leaving ctx->path unterminated. A later strlen() on this buffer (in golioth_coap_client_get_internal()) can read past the end of the allocation, resulting in a crash/denial of service. The input is application-controlled (not network by default).

Affected products

• Golioth Firmware SDK: from 0.19.1 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/0e788217ab4b61a7c1d9fadd1b4a40f5f538a26d
• https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0
• https://secmate.dev/disclosures/SECMATE-2025-0017
• https://www.vulncheck.com/advisories/golioth-firmware-sdk-blockwise-transfer-path-out-of-bounds-read

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