Out-of-bounds Read in 7-Zip
CVE-2026-48112
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- 7-Zip
- Mcmilk 7-Zip — versions >= 9.34, < 26.01
Weakness classification (CWE)
References
- securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/ (Exploit, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-48112?
- CVE-2026-48112 is a medium-severity vulnerability in 7-Zip, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-06-05.
- How severe is CVE-2026-48112?
- Medium severity. CVSS v3 base score is 6.5 out of 10.