CVE-2026-48095

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.1% (66th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-34838 (ENISA EUVD)Source: ENISA EUVD

8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 8.8Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

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
8.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.1%
EPSS %ILE
66th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.

EG Severity
8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
1.1% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 5, 2026

Last Modified

June 8, 2026

Advisory Details (2)

Auto-updated Jun 5, 2026
Patch available. Sources: github.
Web page

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

https://sourceforge.net/p/sevenzip/discussion/45797/thread/555e132ba4
GitHub advisory

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 rangeFix by version rangeDependents
7zip22.01+dfsg-10~exp1, 22.01+dfsg-8, 22.01+dfsg-8+deb12u1, 22.01+dfsg-9, 22.01+really25.01+dfsg-0+deb12u1
  • every version up to 22.01+really26.01+dfsg-0+deb12u1: fixed in 22.01+really26.01+dfsg-0+deb12u1
—
p7zip16.02+dfsg-8, 16.02+really25.01+dfsg-0+deb12u1
  • every version up to 16.02+really26.01+dfsg-0+deb12u1: fixed in 16.02+really26.01+dfsg-0+deb12u1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
7zip24.09+dfsg-8 ... 26.03+dfsg-3 (27 versions)
  • every version on: no fix on record
—
p7zip—
  • every version up to 16.02+transitional.1: fixed in 16.02+transitional.1
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
7zip—
  • every version up to 26.01-r0: fixed in 26.01-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
p7zip16.02+dfsg-8, 16.02+really25.01+dfsg-0+deb11u1
  • every version up to 16.02+really26.01+dfsg-0+deb11u1: fixed in 16.02+really26.01+dfsg-0+deb11u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
7zip24.09+dfsg-8 ... 26.00+dfsg1-3 (18 versions)
  • every version up to 26.01+dfsg-1: fixed in 26.01+dfsg-1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 177 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 77 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 16:34 UTCEPSS rescoreEPSS 1.1% · 66th percentile
  2. 2026-10-29 16:33 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  3. 2026-10-28 16:32 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  4. 2026-10-27 16:32 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  5. 2026-10-26 16:31 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  6. 2026-10-25 16:33 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  7. 2026-10-25 14:23 UTCEG score recompute
  8. 2026-10-24 19:34 UTCEG score recompute
  9. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  10. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  11. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  12. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  13. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  14. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  15. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  16. 2026-10-18 03:35 UTCEG score recompute
  17. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  18. 2026-10-17 12:31 UTCEG score recompute
  19. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  20. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  21. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  23. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  24. 2026-10-12 16:01 UTCEG score recompute
  25. 2026-10-11 19:44 UTCEG score recompute
Show 75 more
  1. 2026-10-11 16:58 UTCEG score recompute
  2. 2026-10-11 14:23 UTCEG score recompute
  3. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  4. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  6. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  7. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  11. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  12. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  15. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  16. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  18. 2026-09-23 17:53 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  19. 2026-09-20 20:16 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  23. 2026-09-14 05:02 UTCEG score recompute
  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  25. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  26. 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  27. 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  28. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  29. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  30. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  31. 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  32. 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  33. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  34. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  35. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  36. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  37. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  38. 2026-08-25 13:49 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  39. 2026-08-25 01:58 UTCEG score recompute
  40. 2026-08-23 12:27 UTCEG score recompute
  41. 2026-08-23 00:19 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  42. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  43. 2026-08-21 07:55 UTCEG score recompute
  44. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  45. 2026-08-20 09:41 UTCEG score recompute
  46. 2026-08-19 17:04 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  47. 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  48. 2026-08-17 13:47 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  49. 2026-08-17 02:16 UTCEG score recompute
  50. 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  51. 2026-08-16 12:56 UTCEG score recompute
  52. 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  53. 2026-08-15 12:24 UTCEG score recompute
  54. 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  55. 2026-08-13 22:31 UTCEG score recompute
  56. 2026-08-13 22:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  57. 2026-08-12 19:11 UTCEG score recompute
  58. 2026-08-12 13:51 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  59. 2026-08-11 19:44 UTCEG score recompute
  60. 2026-08-11 08:45 UTCEG score recompute
  61. 2026-08-11 00:00 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  62. 2026-08-09 23:07 UTCEG score recompute
  63. 2026-08-09 13:46 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  64. 2026-08-09 01:10 UTCEG score recompute
  65. 2026-08-08 16:37 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  66. 2026-08-08 03:12 UTCEG score recompute
  67. 2026-08-06 18:17 UTCEG score recompute
  68. 2026-08-06 13:47 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  69. 2026-08-05 20:20 UTCEG score recompute
  70. 2026-08-05 19:17 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  71. 2026-08-04 17:29 UTCEG score recompute
  72. 2026-08-04 15:10 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  73. 2026-08-04 10:39 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  74. 2026-08-03 15:26 UTCEG score recompute
  75. 2026-08-03 10:36 UTCEPSS rescoreEPSS 1.1% · 62nd percentile

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 GitHub PoC). Defenders should treat patch urgency accordingly.

  • GitHub PoCHORKimhab/CVE-2026-48095
    Published May 26, 2026

    CVE-2026-48095

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-48095?
CVE-2026-48095 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-48095 published?
The CVE record for CVE-2026-48095 was published on June 5, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 8, 2026; the record at its source may have been updated since.
Is CVE-2026-48095 actively exploited?
CVE-2026-48095 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (66th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48095?
CVE-2026-48095 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-48095?
A fix for CVE-2026-48095 is available: update to the fixed version the vendor names in its advisory.

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