zephyr-lwm2m-firmware-update-oob-read-cve-2026-10672-truncated-package-uri

CVE-2026-10672 — Zephyr LwM2M Firmware Update OOB Read PoC Proof of concept for CVE-2026-10672 , an out-of-bounds read in Zephyr RTOS's LwM2M firmware-update pull client subsys/net/lib/lwm2m/lwm2mpullcontext.c. Vulnerability CVE : CVE-2026-10672 CVSS : 8.2 High...

CVE-2026-18746

parsewriteop in subsys/net/lib/lwm2m/lwm2mmessagehandling.c handles inbound CoAP WRITE/CREATE requests that carry a Block1 option. For the first block of a transfer it called initblockctx and then immediately stored the peer-selected block size with blockctx-ctx.blocksize = blocksize before...

CVE-2026-18746: NULL Pointer Dereference

parsewriteop in subsys/net/lib/lwm2m/lwm2mmessagehandling.c handles inbound CoAP WRITE/CREATE requests that carry a Block1 option. For the first block of a transfer it called initblockctx and then immediately stored the peer-selected block size with blockctx-ctx.blocksize = blocksize before...

CVE-2026-18746 NULL pointer dereference in Zephyr LwM2M client when the CoAP Block1 context pool is exhausted

parsewriteop in subsys/net/lib/lwm2m/lwm2mmessagehandling.c handles inbound CoAP WRITE/CREATE requests that carry a Block1 option. For the first block of a transfer it called initblockctx and then immediately stored the peer-selected block size with blockctx-ctx.blocksize = blocksize before...

CVE-2026-18746

The Zephyr LwM2M client is vulnerable to a NULL pointer dereference in the parse_write_op() function within subsys/net/lib/lwm2m/lwm2m_message_handling.c. When the static CoAP Block1 context pool (defaulting to 3 entries) is exhausted, the init_block_ctx() function returns -ENOMEM and sets the ca...

CVE-2026-18746 NULL pointer dereference in Zephyr LwM2M client when the CoAP Block1 context pool is exhausted

parsewriteop in subsys/net/lib/lwm2m/lwm2mmessagehandling.c handles inbound CoAP WRITE/CREATE requests that carry a Block1 option. For the first block of a transfer it called initblockctx and then immediately stored the peer-selected block size with blockctx-ctx.blocksize = blocksize before...

CVE-2026-18746

parsewriteop in subsys/net/lib/lwm2m/lwm2mmessagehandling.c handles inbound CoAP WRITE/CREATE requests that carry a Block1 option. For the first block of a transfer it called initblockctx and then immediately stored the peer-selected block size with blockctx-ctx.blocksize = blocksize before...

PT-2026-102412

Name of the Vulnerable Software and Affected Versions Zephyr LwM2M client affected versions not specified Description The parse write op function in subsys/net/lib/lwm2m/lwm2m message handling.c contains a NULL pointer dereference when handling inbound CoAP WRITE/CREATE requests with a Block1...

CVE-2026-14368

The LwM2M JSON content formatter's getstring in subsys/net/lib/lwm2m/lwm2mrwjson.c copies a parsed JSON string into a caller-supplied buffer and NUL-terminates it. The length guard used if stringlength buflen, which accepts a string whose length is exactly buflen. After memcpy fills the whole...

CVE-2026-14368 Off-by-one out-of-bounds NUL write in Zephyr LwM2M JSON string parser

The LwM2M JSON content formatter's getstring in subsys/net/lib/lwm2m/lwm2mrwjson.c copies a parsed JSON string into a caller-supplied buffer and NUL-terminates it. The length guard used if stringlength buflen, which accepts a string whose length is exactly buflen. After memcpy fills the whole...

EUVD-2026-68723

The LwM2M JSON content formatter's getstring in subsys/net/lib/lwm2m/lwm2mrwjson.c copies a parsed JSON string into a caller-supplied buffer and NUL-terminates it. The length guard used if stringlength buflen, which accepts a string whose length is exactly buflen. After memcpy fills the whole...

CVE-2026-14368

The LwM2M JSON content formatter's getstring in subsys/net/lib/lwm2m/lwm2mrwjson.c copies a parsed JSON string into a caller-supplied buffer and NUL-terminates it. The length guard used if stringlength buflen, which accepts a string whose length is exactly buflen. After memcpy fills the whole...

CVE-2026-14368 Off-by-one out-of-bounds NUL write in Zephyr LwM2M JSON string parser

The LwM2M JSON content formatter's getstring in subsys/net/lib/lwm2m/lwm2mrwjson.c copies a parsed JSON string into a caller-supplied buffer and NUL-terminates it. The length guard used if stringlength buflen, which accepts a string whose length is exactly buflen. After memcpy fills the whole...

CVE-2026-14368

CVE-2026-14368 is an off-by-one out-of-bounds write in the Zephyr RTOS LwM2M JSON content formatter. The get_string() function in subsys/net/lib/lwm2m/lwm2m_rw_json.c uses a boundary check of string_length > buflen instead of >=, allowing a parsed JSON string whose length exactly equals the...

CVE-2026-14368 Off-by-one out-of-bounds NUL write in Zephyr LwM2M JSON string parser

The LwM2M JSON content formatter's getstring in subsys/net/lib/lwm2m/lwm2mrwjson.c copies a parsed JSON string into a caller-supplied buffer and NUL-terminates it. The length guard used if stringlength buflen, which accepts a string whose length is exactly buflen. After memcpy fills the whole...

PT-2026-83953

The LwM2M JSON content formatter's get string in subsys/net/lib/lwm2m/lwm2m rw json.c copies a parsed JSON string into a caller-supplied buffer and NUL-terminates it. The length guard used if string length buflen, which accepts a string whose length is exactly buflen. After memcpy fills the whole...

CVE-2026-14368: Out-of-bounds Write

The LwM2M JSON content formatter's getstring in subsys/net/lib/lwm2m/lwm2mrwjson.c copies a parsed JSON string into a caller-supplied buffer and NUL-terminates it. The length guard used if stringlength buflen, which accepts a string whose length is exactly buflen. After memcpy fills the whole...

CVE-2026-5855

Contiki-NG's LwM2M TLV parser lwm2mtlvread in os/services/lwm2m/lwm2m-tlv.c ignores its caller-supplied buffer length argument and reads up to six bytes from the input buffer with no bounds check. The caller in lwm2m-engine.c iterates while there is at least one byte remaining, so a crafted CoAP...

CVE-2026-5855

Contiki-NG's LwM2M TLV parser lwm2mtlvread in os/services/lwm2m/lwm2m-tlv.c ignores its caller-supplied buffer length argument and reads up to six bytes from the input buffer with no bounds check. The caller in lwm2m-engine.c iterates while there is at least one byte remaining, so a crafted CoAP...

PT-2026-68757

Name of the Vulnerable Software and Affected Versions Contiki-NG affected versions not specified Description The LwM2M TLV parser lwm2m tlv read in os/services/lwm2m/lwm2m-tlv.c fails to validate the caller-supplied buffer length, reading up to six bytes from the input buffer without bounds...