Bug 2553745 (CVE-2026-111137)

Summary: CVE-2026-111137 libsmi: libsmi: Denial of service via out-of-bounds write in smiValueAsString()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libsmi. An out-of-bounds write vulnerability in the smiValueAsString() function allows an attacker to cause a Denial of Service (DoS). By supplying a specially crafted Management Information Base (MIB) file containing an oversized string value, an attacker can overflow an internal buffer, corrupt memory, and crash applications that parse the file.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2554111    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-15 19:30:40 UTC
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.