CVE-2026-111137 Details
Description
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.
A memory safety vulnerability has been identified in libsmi versions through 0.5.0, specifically in the function smiValueAsString within lib/smi.c. This vulnerability allows for an out-of-bounds write by overflowing a fixed 1024-byte static buffer. The issue arises from the hex rendering of OCTET STRING values, where an attacker can craft a Management Information Base (MIB) file containing an OCTET STRING DEFVAL of 512 bytes or more, along with a leading byte to manipulate the buffer handling. The overflow corrupts adjacent global variables within the library, leading to a crash when the modified data is accessed.
The vulnerability has been fixed in the latest commit of the master branch. Users should update to this version.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 15, 2026CISA-ADP
Assessed Oct 16, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| libsmi | <= 0.5.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 16, 2026 | CVE Modified | CISA-ADP |
| Oct 15, 2026 | New CVE Received | [email protected] |