CVE-2026-48503High· 7.5▾ MidnightPoC availablelibIEC61850 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, the MMS file service in src/mms/iso_mms/server/mms_file_service.c accepts an out-o…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 41.3 · likelihood 0 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
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, the MMS file service in src/mms/iso_mms/server/mms_file_service.c accepts an out-of-range initialPosition in fileOpen and stores it in the file-read state. The fileRead path then subtracts the larger read position from the file size using unsigned arithmetic and fails to limit the response to the actual FileSystem_readFile return value. The oversized response can include stale bytes from the reused connection buffer after the requested file contents, disclosing prior response data and protocol fragments to an unauthenticated remote client when the file service is enabled. This issue is fixed in version 1.6.2.
libiec61850 < 1.6.2Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-48741High· 7.5libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoS
CVE-2026-68908Medium· 5.3libIEC61850: Oversized RptID can trigger invalid free of a stack-backed visible string in the report send path
CVE-2026-68907High· 8.2libIEC61850: Server-side out-of-bounds stack read in association-specific dynamic dataset creation due to reversed StringUtils_copyStringToBuffer arguments
CVE-2026-68906High· 8.7libIEC61850: Infinite loop and out-of-bounds read in ACSE parseUserInformation when parsing a malformed AARE PDU
CVE-2026-57446Medium· 5.3libIEC61850: Server-side double free in MMS ObtainFile task reuse due to stale FILE* handle
CVE-2026-73252High· 7.5Mongoose is an embedded web server and network library