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NVD / CVE Program· CNA GitHub_M

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

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.27% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: 7zip (Alpine:v3.24) 26.01-r0; 7zip (Debian:12) 22.01+really26.01+dfsg-0+deb12u1; p7zip (Debian:12) 16.02+really26.01+dfsg-0+deb12u1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to 7zip (Alpine:v3.24) 26.01-r0; 7zip (Debian:12) 22.01+really26.01+dfsg-0+deb12u1; p7zip (Debian:12) 16.02+really26.01+dfsg-0+deb12u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Jun 5, 2026
Updated
Jun 17, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
6.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
7-zip7-zip

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • 7-zip 7-zip9.21 and later · before 26.01

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • mcmilk 7-Zip

    • >= 9.21, < 26.01affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.247zipbefore 26.01-r026.01-r0
Debian:127zipbefore 22.01+really26.01+dfsg-0+deb12u122.01+really26.01+dfsg-0+deb12u1
Debian:12p7zipbefore 16.02+really26.01+dfsg-0+deb12u116.02+really26.01+dfsg-0+deb12u1
Debian:137zipfrom 0—
Debian:13p7zipbefore 16.02+transitional.116.02+transitional.1
Debian:147zipbefore 26.01+dfsg-126.01+dfsg-1
openSUSE:Leap 16.07zipbefore 26.01-160000.1.126.01-160000.1.1
openSUSE:Tumbleweed7zipbefore 26.02-2.126.02-2.1
SUSE:Linux Enterprise Module for Basesystem 15 SP77zipbefore 26.01-150400.9.6.126.01-150400.9.6.1
SUSE:Linux Enterprise Server 16.07zipbefore 26.01-160000.1.126.01-160000.1.1

Same product

7-zip: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-04117-Zip Mark-of-the-Web Bypass VulnerabilityKEV
    78This week
  • CVE-2023-31102Ppmd7.c in 7-Zip before 23.00 allows an integer underflow and invalid read operation via a crafted 7Z archive.
    47Plan
  • CVE-2008-6536Unspecified vulnerability in 7-zip before 4.5.7 has unknown impact and remote attack vectors, as demonstrated by the PROTOS GENOME test suit
    41Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-48092Jun 5, 2026 · 7-Zip SquashFS Fragment Offset Overflow (GHSL-2026-116)
    33Monitor
  • ← EarlierCVE-2026-48095Jun 5, 2026 · GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer under-allocation
    35Monitor
  • Later →CVE-2026-48102Jun 5, 2026 · GHSL-2026-118: 7-Zip UDF Field OOB Read
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:7zip26.01-r0 · Alpine:v3.24Package registry (OSV)
debian:7zip22.01+really26.01+dfsg-0+deb12u1 · Debian:12Package registry (OSV)
debian:p7zip16.02+really26.01+dfsg-0+deb12u1 · Debian:12Package registry (OSV)
opensuse:7zip26.02-2.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:7zip26.01-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-104086131 days apart7-Zip < 26.03 SquashFS Uninitialized Memory Disclosure via UID/GID Table
    27Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-908 · Use of Uninitialized Resource

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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