Out-of-bounds read when decoding SNMP messages in Contiki-NG
Description
Contiki-NG is an open-source, cross-platform operating system for IoT devices. An out-of-bounds read of 1 byte can be triggered when sending a packet to a device running the Contiki-NG operating system with SNMP enabled. The SNMP module is disabled in the default Contiki-NG configuration. The vulnerability exists in the os/net/app-layer/snmp/snmp-message.c module, where the snmp_message_decode function fails to check the boundary of the message buffer when reading a byte from it immediately after decoding an object identifier (OID). The problem has been patched in Contiki-NG pull request 2937. It will be included in the next release of Contiki-NG. Users are advised to either apply the patch manually or to wait for the next release. A workaround is to disable the SNMP module in the Contiki-NG build configuration.
Affected products
1- Range: <= 4.9
Patches
1fccd6917f6ebMerge pull request #2937 from OwenCochell/snmp-vuln-message
1 file changed · +5 −0
os/net/app-layer/snmp/snmp-message.c+5 −0 modified@@ -317,6 +317,11 @@ snmp_message_decode(snmp_packet_t *snmp_packet, snmp_header_t *header, snmp_varb return 0; } + if (snmp_packet->used == 0) { + LOG_DBG("Could not decode value type\n"); + return 0; + } + varbinds[i].value_type = *snmp_packet->in; switch(varbinds[i].value_type) {
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
2- github.com/contiki-ng/contiki-ng/pull/2937mitrex_refsource_MISC
- github.com/contiki-ng/contiki-ng/security/advisories/GHSA-444j-93j3-5gj4mitrex_refsource_CONFIRM
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