CVE-2026-48101 | GHSL-2026-117: 7-Zip UEFI Capsule uninitialized heap memory disclosure

Exp

7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.

Published: 2026-06-05 Last update: 2026-06-11 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-48101 is rated Exploit Available (52.3/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.40%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-48101

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-48101

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.03% 0.40% +0.37%
2 2026-06-06 — 0.03% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-48101

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2026-48101

OS Trackers for CVE-2026-48101

vendor priority summary link
debian unimportant CVE-2026-48101 unimportant priority: Debian including 2 source packages (7zip, p7zip), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 4, resolved 3. https://security-tracker.debian.org/tracker/CVE-2026-48101
suse medium — https://www.suse.com/security/cve/CVE-2026-48101/
ubuntu medium CVE-2026-48101 medium priority: Ubuntu including 2 source packages (7zip, p7zip), 13 status rows across 8 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream): needs-triage 8, not-affected 3, released 2. https://ubuntu.com/security/CVE-2026-48101

Affected software / configurations for CVE-2026-48101

Vendor Product Version Raw CPE
7-zip 7-zip >= 9.21, < 26.01 cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:*

References for CVE-2026-48101

cvelogic Threat Intelligence