SB2026011250 - Remote code execution in libcoap

Description

This security bulletin contains information about 1 security vulnerability.

1) Stack-based buffer overflow (CVE-ID: CVE-2025-34468)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the coap_resolve_address_info() function in src/coap_address.c when proxy logic is enabled. A remote attacker can pass an overly long hostname to the application, trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://github.com/obgm/libcoap/commit/30db3ea
• https://github.com/obgm/libcoap/pull/1737
• https://www.vulncheck.com/advisories/libcoap-stack-based-buffer-overflow-in-address-resolution-dos-or-potential-rce