CVE-2025-50518 Use after free in n/a
A use-after-free in libcoap allows arbitrary code execution if the library is used incorrectly by the application.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-50518?
CVE-2025-50518 is a critical use after free vulnerability in n/a, published on 14 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-416
Which versions are affected by CVE-2025-50518?
How do I fix CVE-2025-50518?
No fix has been published for CVE-2025-50518 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-50518 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-50518 exists.
Sources
Also known as GHSA-fc59-q736-3r9p, UBUNTU-CVE-2025-50518.