CVE-2025-50518

critical · 9.8

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.

9.8

CVSS

0.4%

EPSS (exploit prob.)

38th

EPSS percentile

2025-08-14

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-416

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-50518