GHSL-2026-122 7-Zip Ar SYMDEF OOB Read

7-Zip is a file archiver with a high compression ratio. Versions 9.18 through 26.00 contain a heap out-of-bounds read in 7-Zip Ar handler BSD SYMDEF parser. A 4-byte heap out-of-bounds read exists in the Unix ar archive parser in 7-Zip. When parsing a BSD-style __.SYMDEF symbol table, the ParseLibSymbols function reads a 32-bit namesSize field via Get32 at a position that can equal the buffer size, reading 4 bytes past the end of the heap allocation. This reads uninitialized heap data under the default allocator. Version 26.01 patches the issue.

Problem type

Affected products

mcmilk

7-Zip

>= 9.34, < 26.01 - AFFECTED

References

https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/

https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/

x_refsource_CONFIRM

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-48112

Click to expand

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-48112",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-06-05T16:20:19.633Z",
    "dateReserved": "2026-05-20T18:46:58.289Z",
    "datePublished": "2026-06-05T16:20:19.633Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-06-05T16:20:19.633Z"
      },
      "title": "GHSL-2026-122 7-Zip Ar SYMDEF OOB Read",
      "descriptions": [
        {
          "lang": "en",
          "value": "7-Zip is a file archiver with a high compression ratio. Versions 9.18 through 26.00 contain a heap out-of-bounds read in 7-Zip Ar handler BSD SYMDEF parser. A 4-byte heap out-of-bounds read exists in the Unix ar archive parser in 7-Zip. When parsing a BSD-style __.SYMDEF symbol table, the ParseLibSymbols function reads a 32-bit namesSize field via Get32 at a position that can equal the buffer size, reading 4 bytes past the end of the heap allocation. This reads uninitialized heap data under the default allocator. Version 26.01 patches the issue."
        }
      ],
      "affected": [
        {
          "vendor": "mcmilk",
          "product": "7-Zip",
          "versions": [
            {
              "version": ">= 9.34, < 26.01",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-190: Integer Overflow or Wraparound",
              "cweId": "CWE-190",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-125: Out-of-bounds Read",
              "cweId": "CWE-125",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/",
          "name": "https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/",
          "tags": [
            "x_refsource_CONFIRM"
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "REQUIRED",
            "scope": "UNCHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM"
          }
        }
      ]
    }
  }
}