CVE-2025-50518

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-08-14 · updated 2026-06-17
Weakness: CWE-416

Description

A use-after-free vulnerability exists in the coap_delete_pdu_lkd function within coap_pdu.c of the libcoap library. This issue occurs due to improper handling of memory after the freeing of a PDU object, leading to potential memory corruption or the possibility of executing arbitrary code. NOTE: this is disputed by the Supplier because it only occurs when an application uses libcoap incorrectly.

References

https://github.com/IreneTheITCrowd/blog/blob/main/libcoap-vulnerability.md
https://github.com/IreneTheITCrowd/blog/issues/1
https://github.com/obgm/libcoap/issues/1724#issuecomment-3199631257
https://github.com/obgm/libcoap/issues/1724#issuecomment-3234613482

Get alerted when CVE-2025-50518 or the next vulnerability affects your stack