https://devzone.nordicsemi.com/f/nordic-q-a/126631/nrf54lm20-mbedtls-heap-exhaustionIssue On the nrf54lm20 using DTLS with MbedTLS, MbedTLS&#39;s heap can be exhausted. This will result in a TLS handshake error. When this issue happens MbedTLS does not catch the heap exhaustion, it will just fail to complete the TLS handshake. Errors en-USTelligent Community 13Thu, 22 Jan 2026 10:01:42 GMThttps://devzone.nordicsemi.com/thread/559334?ContentTypeID=1Thu, 22 Jan 2026 10:01:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1e95471f-a62b-4cbb-9c20-21fd076e7502Maria Gilje<p>You should be able to get more information from the sample by using a console or terminal output and setting&nbsp;</p> <p><code>CONFIG_DEBUG_C=y</code></p> <p><code></code><code>CONFIG_MBEDTLS_MEMORY_DEBUG=y</code>&nbsp;</p> <p>In the logs you can look for i.e. allocation issues.&nbsp;</p> <p>Best regards,</p> <p>Maria</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/559328?ContentTypeID=1Thu, 22 Jan 2026 08:11:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3f25b4b7-4520-4215-a61c-9ec33a8aa079Maria Gilje<p>Hello,&nbsp;</p> <p>Thank you for contacting us about this. I have forwarded this internally and I will share feedback I get with you.&nbsp;</p> <p>Best regards,</p> <p>Maria</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/559323?ContentTypeID=1Thu, 22 Jan 2026 03:34:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:917f9beb-9345-4650-9a3b-802a769a44beashlin4010<p>I made an error. G<span>olioth is setting&nbsp;<code>CONFIG_MBEDTLS_HEAP_SIZE=10240,&nbsp;</code></span>a value of&nbsp;<em>49152</em> is&nbsp;sufficient to avoid the TLS errors.</p> <p>Regardless, should MbedTLS detect heap exhaustion?</p><div style="clear:both;"></div>