GHSL-2026-117: 7-Zip UEFI Capsule uninitialized heap memory disclosure
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
- Jun 5, 2026
- Updated
- Jun 17, 2026
- EPSS
- 0.4% · 32th percentile
- CWE
- CWE-908
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Report tools
Action score
26
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| 7-zip | 7-zip | cpe:2.3:a:7-zip:7-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.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.24 | 7zip | before 26.01-r0 | 26.01-r0 |
| Debian:12 | 7zip | before 22.01+really26.01+dfsg-0+deb12u1 | 22.01+really26.01+dfsg-0+deb12u1 |
| Debian:12 | p7zip | before 16.02+really26.01+dfsg-0+deb12u1 | 16.02+really26.01+dfsg-0+deb12u1 |
| Debian:13 | 7zip | all versions | — |
| Debian:13 | p7zip | before 16.02+transitional.1 | 16.02+transitional.1 |
| Debian:14 | 7zip | before 26.01+dfsg-1 | 26.01+dfsg-1 |
| openSUSE:Leap 16.0 | 7zip | before 26.01-160000.1.1 | 26.01-160000.1.1 |
| openSUSE:Tumbleweed | 7zip | before 26.02-2.1 | 26.02-2.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | 7zip | before 26.01-150400.9.6.1 | 26.01-150400.9.6.1 |
| SUSE:Linux Enterprise Server 16.0 | 7zip | before 26.01-160000.1.1 | 26.01-160000.1.1 |
Same product
7-zip: all recordsOther highest-scoring records for the same primary product.
- CVE-2025-04117-Zip Mark-of-the-Web Bypass VulnerabilityKEV78This week
- CVE-2023-31102Ppmd7.c in 7-Zip before 23.00 allows an integer underflow and invalid read operation via a crafted 7Z archive.48Plan
- 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 suit41Plan
- CVE-2025-110017-Zip ZIP File Parsing Directory Traversal Remote Code Execution Vulnerability39Monitor
- CVE-2024-114777-Zip Zstandard Decompression Integer Underflow Remote Code Execution Vulnerability38Monitor
- CVE-2026-48095GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer under-allocation35Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:7zip | 26.01-r0 · Alpine:v3.24 | Package registry (OSV) |
| debian:7zip | 22.01+really26.01+dfsg-0+deb12u1 · Debian:12 | Package registry (OSV) |
| debian:p7zip | 16.02+really26.01+dfsg-0+deb12u1 · Debian:12 | Package registry (OSV) |
| opensuse:7zip | 26.02-2.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:7zip | 26.01-160000.1.1 · SUSE:Linux Enterprise Server 16.0 | Package 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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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 researchersFinders, 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.
No nightly-computed relations.
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.
- TR-26-0328 · Jun 8, 2026(7-Zip Güvenlik Zafiyeti)
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 ResourceCVSS 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
- Fix✗ → ✓
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