CVE-2026-111137 (GCVE-0-2026-111137)

Vulnerability from cvelistv5 – Published: 2026-10-15 18:57 – Updated: 2026-10-15 18:57
VLAI
Title
libsmi through 0.5.0 Out-of-Bounds Write via smiValueAsString OCTET STRING DEFVAL
Summary
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.
Severity
6.9 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
6.1 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CWE
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6249 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
amartin755 libsmi Affected: 0 , ≤ 0.5.0 (custom)
guessed Create a notification for this product.
Date Public
2026-10-15 00:00
Credits
HaiND from the Post and Telecommunication Institute of Technology
Show details on NVD website
To clipboard 

{
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        }
      ],
      "metrics": [
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            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
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            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
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            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
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            "userInteraction": "REQUIRED",
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          "descriptions": [
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      "providerMetadata": {
        "dateUpdated": "2026-10-15T18:57:30.581Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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      "references": [
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          "tags": [
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          "url": "https://hackmd.io/@haind-pwn/libsmi-smivalueasstring-octetstring-defval-oob-write"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/amartin755/libsmi/blob/c58307210fe995ec419db976eb234aebc71a9216/lib/smi.c#L479-L566"
        },
        {
          "tags": [
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          ],
          "url": "https://github.com/amartin755/libsmi"
        },
        {
          "name": "VulnCheck Advisory: libsmi through 0.5.0 Out-of-Bounds Write via smiValueAsString OCTET STRING DEFVAL",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/libsmi-through-0.5.0-out-of-bounds-write-via-smivalueasstring-octet-string-defval"
        }
      ],
      "title": "libsmi through 0.5.0 Out-of-Bounds Write via smiValueAsString OCTET STRING DEFVAL",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-111137",
    "datePublished": "2026-10-15T18:57:30.581Z",
    "dateReserved": "2026-10-15T17:03:55.430Z",
    "dateUpdated": "2026-10-15T18:57:30.581Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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                "defaultStatus": "unaffected",
                "product": "libsmi",
                "repo": "https://github.com/amartin755/libsmi",
                "vendor": "amartin755",
                "versions": [
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                    "status": "affected",
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        "cveTags": [],
        "descriptions": [
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            "value": "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."
          }
        ],
        "id": "CVE-2026-111137",
        "lastModified": "2026-10-15T19:17:27.690",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
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                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
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                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H",
                "version": "3.1"
              },
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              "impactScore": 4.2,
              "source": "disclosure@vulncheck.com",
              "type": "Primary"
            }
          ],
          "cvssMetricV40": [
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              "cvssData": {
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                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
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                "availabilityRequirement": "NOT_DEFINED",
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                "baseSeverity": "MEDIUM",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "PASSIVE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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            "url": "https://github.com/amartin755/libsmi"
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          {
            "source": "disclosure@vulncheck.com",
            "url": "https://github.com/amartin755/libsmi/blob/c58307210fe995ec419db976eb234aebc71a9216/lib/smi.c#L479-L566"
          },
          {
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            "url": "https://hackmd.io/@haind-pwn/libsmi-smivalueasstring-octetstring-defval-oob-write"
          },
          {
            "source": "disclosure@vulncheck.com",
            "url": "https://www.vulncheck.com/advisories/libsmi-through-0.5.0-out-of-bounds-write-via-smivalueasstring-octet-string-defval"
          }
        ],
        "sourceIdentifier": "disclosure@vulncheck.com",
        "vulnStatus": "Received",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-15T20:50:39+00:00",
      "cve": "CVE-2026-111137",
      "id": "CVE-2026-111137",
      "initial_release_date": "2026-10-15T18:57:30.581000+00:00",
      "product_status:known_affected": "8",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libsmi: libsmi: Denial of service via out-of-bounds write in smiValueAsString()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-111137.json",
      "version": "3"
    }
  }
}



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