SOEM (<= 2.0.0) - CraftedSignal Threat Feed

SOEM: Out-of-bounds memory read vulnerability (CVE-2026-82947)

hello@craftedsignal.io — Mon, 26 Oct 2026 09:41:24 +0000

CVE-2026-82947 involves a memory safety vulnerability in the SOEM frame processing logic. An attacker-controlled device can provide manipulated length and offset values within EtherCAT messages. Because the master does not validate these inputs against allocated buffer sizes, it performs out-of-bounds reads. This flaw can lead to sensitive information disclosure or a denial-of-service condition via application crashes.

Impact

Successful exploitation may result in the disclosure of memory contents to an attacker or an unexpected crash of the master process.

Recommendation

Identify systems utilizing the SOEM library version 2.0.0 or earlier. Monitor for unusual application crashes or logs indicative of memory access violations in the EtherCAT master service. Upgrade to a patched version once released by the maintainers.

SOEM: Multi-segment data transfer buffer overflow (CVE-2026-82944)

hello@craftedsignal.io — Mon, 26 Oct 2026 09:41:18 +0000

SOEM (Simple Open EtherCAT Master) versions 2.0.0 and earlier contain a vulnerability in the handling of multi-segment data transfers. The application performs a single validation check on the total data size at the beginning of a transfer but fails to track the cumulative size as individual segments arrive. This allows a malicious device to bypass initial size checks and write controlled data beyond allocated memory buffer boundaries, potentially enabling code execution.

SOEM: Out-of-bounds memory access (CVE-2026-70388)

hello@craftedsignal.io — Mon, 26 Oct 2026 09:41:11 +0000

SOEM version 2.0.0 and earlier contains an out-of-bounds memory access vulnerability (CVE-2026-70388). The vulnerability exists because the software performs arithmetic on message length values without proper validation, allowing negative or extremely large values to bypass safety checks. This allows a malicious device on the network to send specially crafted messages that cause the master to write data outside allocated memory boundaries.

Impact

Successful exploitation can lead to memory corruption, which may result in a crash of the master service or potentially allow an attacker to execute arbitrary code on the master system.

Recommendation

Update SOEM to a patched version beyond 2.0.0 once available. In the absence of a patch, restrict network access to the master system to trusted devices only to prevent malicious actors from sending crafted network messages.