CVE-2026-68906: CWE-125: Out-of-bounds Read in mz-automation libiec61850
Description
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 v4.0
Score 8.7high
Affected software
mz-automation
libiec61850
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-31T21:04:04.040Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad24b622cdf04f65607013b
Added to database: 10/16/2026, 16:05:54 UTC
Last updated: 10/16/2026, 16:05:54 UTC
Views: 1
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