CVE-2026-48095

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.1%, top 36% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing attackers to cause arbitrary code execution or application crashes. CInStream::GetCuSize() in the NTFS handler computes the compression-unit buffer size as (UInt32)1 << (BlockSizeLog + CompressionUnit), and a crafted image with ClusterSizeLog >= 28 and CompressionUnit == 4 drives the exponent to 32, which is undefined behavior and collapses on x86/x64 so _inBuf is allocated as 1 byte. ReadStream_FALSE then writes up to 256 MB of attacker-controlled data into that 1-byte buffer in 64 KB iterations, and because the CInStream object sits only 304 bytes after _inBuf, its vtable pointer is overwritten and the next dispatched call achieves a vtable hijack. On 32-bit builds the overflow is unconditionally reached; on 64-bit it requires the parallel 8 GB _outBuf allocation to succeed, otherwise failing closed to denial of service. The NTFS handler is enabled by default in stock 7z.dll and, via signature-based fallback matching "NTFS " at offset 3, will open a crafted image regardless of file extension during extraction or testing. Version 26.01 fixes the issue.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
64%
KEV
Not listed

Published

June 5, 2026

Last Modified

June 8, 2026

Advisory Details (2)

Auto-updated Jun 5, 2026
🔬 Proof of concept available. No patch confirmed yet. Sources: github.
generic

7-Zip / Discussion / Open Discussion: 7-Zip 26.01

https://sourceforge.net/p/sevenzip/discussion/45797/thread/555e132ba4
github🟡 PoC Available

GHSL-2026-140: Heap Buffer Write Overflow in 7-Zip | GitHub Security Lab

https://securitylab.github.com/advisories/GHSL-2026-140_7-Zip/

Affected Packages

(7 across 5 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
7zip22.01+dfsg-10~exp1, 22.01+dfsg-8, 22.01+dfsg-8+deb12u1, 22.01+dfsg-9, 22.01+really25.01+dfsg-0+deb12u122.01+really26.01+dfsg-0+deb12u1—
p7zip16.02+dfsg-8, 16.02+really25.01+dfsg-0+deb12u116.02+really26.01+dfsg-0+deb12u1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
7zip24.09+dfsg-8 ... 26.02+dfsg-3 (24 versions)——
p7zip—16.02+transitional.1—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
7zip—26.01-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
p7zip16.02+dfsg-8, 16.02+really25.01+dfsg-0+deb11u116.02+really26.01+dfsg-0+deb11u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
7zip24.09+dfsg-8 ... 26.00+dfsg1-3 (18 versions)26.01+dfsg-1—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 131 total refreshes for this CVE.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 05:02 UTCEG score recompute
  3. 2026-09-13 16:47 UTCEPSS rescore
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  1. 2026-08-18 13:48 UTCEPSS rescore
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  3. 2026-08-17 02:16 UTCEG score recompute
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  26. 2026-08-04 15:10 UTCEPSS rescore
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  39. 2026-07-28 03:02 UTCEG score recompute
  40. 2026-07-26 21:56 UTCEG score recompute
  41. 2026-07-26 14:54 UTCEPSS rescore
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  44. 2026-07-23 14:18 UTCEPSS rescore
  45. 2026-07-23 03:18 UTCEG score recompute
  46. 2026-07-22 14:08 UTCEPSS rescore
  47. 2026-07-21 15:24 UTCEPSS rescore
  48. 2026-07-20 17:08 UTCEPSS rescore
  49. 2026-07-19 14:31 UTCEPSS rescore
  50. 2026-07-19 02:29 UTCEPSS rescore
  51. 2026-07-18 10:04 UTCEPSS rescore
  52. 2026-07-16 17:03 UTCEPSS rescore
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  74. 2026-06-25 13:49 UTCEPSS rescore
  75. 2026-06-24 14:05 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCHORKimhab/CVE-2026-48095
    First seen May 26, 2026

    CVE-2026-48095

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48095?
CVE-2026-48095 is a high vulnerability published on June 5, 2026. 7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing attackers to cause arbitrary code execution or application…
When was CVE-2026-48095 disclosed?
CVE-2026-48095 was first published in the National Vulnerability Database on June 5, 2026, with the most recent update on June 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48095 actively exploited?
CVE-2026-48095 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 35.7% of all scored CVEs.
What is the CVSS score of CVE-2026-48095?
CVE-2026-48095 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-48095?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48095, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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