CVE-2026-68906: high-severity vulnerability in mz-automation libiec61850
libIEC61850: Infinite loop and out-of-bounds read in ACSE parseUserInformation when parsing a malformed AARE PDU
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.5%
libIEC61850 is an open-source implementation of IEC 61850 client and server protocols including MMS, GOOSE, Sampled Values, and R-Session. Prior to 1.6.2, parseUserInformation in src/mms/iso_acse/acse.c checks len for zero before validating the negative bufPos returned by BerDecoder_decodeLength for a truncated long-form length. The continue path therefore swallows the error, reads buffer[-1], resets parsing to the beginning, and repeats the same malformed state. An unauthenticated remote peer can send a malformed AARE PDU during association to cause an infinite CPU loop under a normal allocator or a one-byte out-of-bounds read and process abort when the preceding byte is inaccessible. This issue is fixed in version 1.6.2.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
mz-automation · libiec61850Related CVEs — mz-automation libiec61850
In the same product, most dangerous first.
CVE-2020-15158HIGHHeap buffer overflow in libIEC61850EPSS 2.0%CVE-2019-1010300—CVE-2019-1010300EPSS 1.3%CVE-2026-18583MEDIUMmz-automation libiec61850 MMS Request mms_mapping.c checkDataSetAccess out-of-boundsEPSS 0.9%CVE-2026-18582MEDIUMmz-automation libiec61850 Report Sending Path reporting.c Reporting_RCBWriteAccessHandler free of memory not on the heapEPSS 0.9%CVE-2026-48741HIGHlibIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoSEPSS 0.5%CVE-2026-48503HIGHlibIEC61850: Remote information disclosure in MMS file service via out-of-range initialPosition in fileOpen followed by fileReadEPSS 0.5%