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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
mcmilk 7-Zip affected
Version Status Constraints
>= 9.34, < 26.01 affected —

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/ cve-icon cve-icon
History

Fri, 05 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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.
Title GHSL-2026-122 7-Zip Ar SYMDEF OOB Read
Weaknesses CWE-125
CWE-190
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-05T16:20:19.633Z

Reserved: 2026-05-20T18:46:58.289Z

Link: CVE-2026-48112

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-05T17:16:49.353

Modified: 2026-06-05T17:16:49.353

Link: CVE-2026-48112

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-05T17:30:45Z

Weaknesses