Echo: 7zip: security update to 22.01+really26.01+dfsg-0+deb12u1

high Tenable Self-Hosted Container Security Plugin ID 461813

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- 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.
(CVE-2026-48103)

Solution

Update the 7zip library and its related packages to version 22.01+really26.01+dfsg-0+deb12u1 or later.

Plugin Details

Severity: High

ID: 461813

Version: Revision 1.1

Type: Local

Family: Echo Local Security Checks

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.5

Percentile: 96.41

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:C

CVSS Score Source: CVE-2026-48103

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/6/2026

Vulnerability Publication Date: 6/4/2026

Reference Information

CVE: CVE-2026-48103

IAVA: 2026-A-0525

Detections

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