# CVE-2026-48102: 7zip: 7-Zip is a file archiver with a high compression ratio

CVE-2026-48102 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: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-48102
- Priority: Routine
- CVSS: 4.3 (medium)
- EPSS: 0.0019
- 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 9.11 through 26.00 contain a heap out-of-bounds read of up to 3 bytes in the UDF disc image handler's File Identifier Descriptor parser. In CFileId::Parse (CPP/7zip/Archive/Udf/UdfIn.cpp), after validating size < 38 + idLen + impLen and advancing processed to 38 + impLen + idLen, the alignment-padding loop reads p[processed] while incrementing up to 3 times to reach a 4-byte boundary, and the processed <= size bounds check only runs after the loop. When (38 + impLen + idLen) % 4 != 0 and 38 + impLen + idLen == size, the loop reads 1 to 3 bytes past the end of the exact-size heap buffer allocated via buf.Alloc((size_t)item.Size). The UDF handler is registered for .iso and .udf files and auto-detected by signature, and the OOB read triggers during Open() when listing or extracting a crafted UDF image. Impact is limited to information disclosure (a 1-bit oracle per OOB byte via open/fail behavior) and denial of service (crash under hardened allocators); there is no write primitive. Version 26.01 fixes the issue.

## 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-2026-48102](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48102.md) | Jun 24, 2026 |
| Linux | 7zip Debian 14 | 26.01+dfsg-1 | [DEBIAN-CVE-2026-48102](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48102.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-2026-48102](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48102.md) | Jun 24, 2026 |
| Linux | p7zip Debian 13.5 (trixie) | 16.02+transitional.1 | [DEBIAN-CVE-2026-48102](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48102.md) | Jun 24, 2026 |

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Data as of 2026-11-08T13:06:02Z 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

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