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CVE-2026-48112 mcmilk CVE debrief

CVE-2026-48112 is a medium-severity vulnerability in 7-Zip, a file archiver with a high compression ratio. Versions 9.18 through 26.00 are affected by a heap out-of-bounds read in the 7-Zip Ar handler BSD SYMDEF parser. The vulnerability occurs when parsing a BSD-style __.SYMDEF symbol table, where 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. The issue was patched in version 26.01.

Vendor
mcmilk
Product
7-Zip
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-06-08
Advisory published
2026-06-05
Advisory updated
2026-06-08

Who should care

Users of 7-Zip versions 9.18 through 26.00 should update to version 26.01 or later to mitigate this vulnerability.

Technical summary

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.

Defensive priority

Medium

Recommended defensive actions

  • Update 7-Zip to version 26.01 or later.

Evidence notes

CVE-2026-48112 was published on [cvePublishedAt] and modified on [cveModifiedAt]. The vulnerability has a CVSS score of 6.5 and is classified as CWE-125 and CWE-190.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48112 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48112

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-48112 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48112

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.