CVE-2026-111137
libsmi through 0.5.0 Out-of-Bounds Write via smiValueAsString OCTET STRING DEFVAL
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
libsmi through 0.5.0 contains an out-of-bounds write vulnerability in smiValueAsString() in lib/smi.c that allows attackers to overflow a fixed 1024-byte static buffer through hex rendering of OCTET STRING values. Attackers can supply a crafted MIB with an OCTET STRING DEFVAL of 512 or more octets and a leading 0x00 byte to corrupt adjacent library globals and crash smidump or other consumers.
| CWE | CWE-787 |
| Vendor | amartin755 |
| Product | libsmi |
| Published | Oct 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Affected Versions
amartin755 / libsmi
0 ≤ 0.5.0
References
hackmd.io: https://hackmd.io/@haind-pwn/libsmi-smivalueasstring-octetstring-defval-oob-write github.com: https://github.com/amartin755/libsmi/blob/c58307210fe995ec419db976eb234aebc71a9216/lib/smi.c#L479-L566 github.com: https://github.com/amartin755/libsmi vulncheck.com: https://www.vulncheck.com/advisories/libsmi-through-0.5.0-out-of-bounds-write-via-smivalueasstring-octet-string-defval
Credits
HaiND from the Post and Telecommunication Institute of Technology