CVE-2026-68906
The continue path therefore swallows the error, reads buffer[-1], resets parsing to the beginning, and repeats the same malformed state.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 4.0
- 8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.47% probability · 41th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125, CWE-835
- Source
- security-advisories@github.com
EPSS moved from 0.4% on 17 October 2026 to 0.5% on 26 October 2026.
References
- https://github.com/mz-automation/libiec61850/commit/2edf2a12bf0ced6a2ac595862e3e873814983f7f
- https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2
- https://github.com/mz-automation/libiec61850/security/advisories/GHSA-f7xm-q62q-22cx
- https://github.com/mz-automation/libiec61850/security/advisories/GHSA-f7xm-q62q-22cx
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.