# CVE-2026-48103: 7zip: 7-Zip is a file archiver with a high compression ratio

CVE-2026-48103 is fixed in 2 products on 1 platform, first by SUSE-SU-2026:22347-1, released June 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-48103
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0216
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 5, 2026

## Description

7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain an off-by-one heap out-of-bounds read in the WIM (Windows Imaging) archive handler's security descriptor lookup. In CHandler::GetSecurity (CPP/7zip/Archive/Wim/WimHandler.cpp), the per-image SecurOffsets table holds numEntries + 1 cumulative offsets, but the check securityId >= SecurOffsets.Size() admits securityId == numEntries, and the function then reads SecurOffsets[securityId + 1], fetching one UInt32 past the end of the heap-allocated CRecordVector (which performs no bounds checking on operator[]). The securityId is attacker-controlled at offset +0xC of any directory entry in WIM metadata, and the handler is registered for .wim, .swm, .esd, and .ppkg and enabled by default in stock 7z.dll; the OOB triggers zero-click in the GUI because 7zFM.exe's ListView calls GetRawProp(kpidNtSecure) for every item during listing (ASan-confirmed), and is also reachable via CLI listing with 7zz l -slt. Impact is limited to denial of service under hardened allocators and minor information disclosure, since the OOB value is only consumed arithmetically as a length and is not surfaced to the attacker; there is no write primitive.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | 7zip Debian 12.15 (bookworm) | 22.01+really26.01+dfsg-0+deb12u1 | [DEBIAN-CVE-2026-48103](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48103.md) | Jun 24, 2026 |
| Linux | 7zip Debian 14 | 26.01+dfsg-1 | [DEBIAN-CVE-2026-48103](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48103.md) | Jun 24, 2026 |
| Linux | 7zip opensuse-leap 16.0 | 26.01-160000.1.1 | [OPENSUSE-SU-2026:21038-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21038-1.md) | Jun 23, 2026 |
| Linux | 7zip sles 15.6 | 26.01-150400.9.6.1 | [SUSE-SU-2026:2696-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2696-1.md) | Jun 30, 2026 |
| Linux | 7zip sles 15.7 | 26.01-150400.9.6.1 | [SUSE-SU-2026:2696-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2696-1.md) | Jun 30, 2026 |
| Linux | 7zip sles 16.0 | 26.01-160000.1.1 | [SUSE-SU-2026:22347-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22347-1.md) | Jun 23, 2026 |
| Linux | p7zip Debian 12.15 (bookworm) | 16.02+really26.01+dfsg-0+deb12u1 | [DEBIAN-CVE-2026-48103](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48103.md) | Jun 24, 2026 |
| Linux | p7zip Debian 13.5 (trixie) | 16.02+transitional.1 | [DEBIAN-CVE-2026-48103](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48103.md) | Jun 24, 2026 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.