CVE-2026-54616

HIGHPre-NVD 7.17.1
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (36th 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
7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.1Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

NanaZip is the 7-Zip derivative intended for the modern Windows experience. From version 1.0.88.0 until stable version 6.0.1698.0 and preview version 6.5.1742.0, the Lz4Decode function in NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHandler.cpp rejects only a zero return from LZ4_decompress_safe even though malformed input produces a negative error value. The negative int is converted to the unsigned SizeT destLen and then truncated into outBufWasWrittenSize, causing ReadBlock to trust an attacker-inflated _cachedUnpackBlockSize. During fragment extraction, an attacker-controlled inode Offset can make memcpy read beyond the _cachedBlock heap allocation and place adjacent heap contents in the extracted file, or crash the process. This issue is fixed in stable version 6.0.1698.0 and preview version 6.5.1742.0.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
48
EG Risk 48/100

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 (value × EchelonGraph’s weight)
Severity71% × 45%
The EG Score, 7.1 of 10.
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 or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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.
EPSS PROB
0.4%
EPSS %ILE
36th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 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 partial (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

August 20, 2026

Last Modified

September 18, 2026

Advisory Details (5)

Auto-updated Aug 20, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

NanaZip 6.5 Preview (6.5.1742.0)

Patch available: M2Team/NanaZip 6.5.1742.0 (pre-release)

https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0
GitHub release Patch Available

NanaZip 6.0 Update 5 (6.0.1698.0)

Patch available: M2Team/NanaZip 6.0.1698.0

https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0
GitHub commit

commit ce0322a1932e (M2Team/NanaZip)

Fix landed in M2Team/NanaZip commit ce0322a1932e — awaiting tagged release

https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956
GitHub commit

commit 733e8570d2ba (M2Team/NanaZip)

Fix landed in M2Team/NanaZip commit 733e8570d2ba — awaiting tagged release

https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f
GitHub advisoryMentions a patch (unverified)

Heap out-of-bounds read in NanaZip SquashFS LZ4 decompressor via unchecked negative return value (GHSL-2026-124) · Advisory · M2Team/NanaZip · GitHub

https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 53× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-08 05:28 UTCEG score recompute
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-10-06 16:53 UTCEG score recompute
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  15. 2026-10-06 03:28 UTCEG score recompute
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-10-05 09:30 UTCEG score recompute
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-03 16:48 UTCEG score recompute
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  21. 2026-10-02 21:35 UTCEG score recompute
  22. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  23. 2026-10-01 21:30 UTCEG score recompute
  24. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-09-30 20:32 UTCEG score recompute
Show 74 more
  1. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-09-30 08:17 UTCEG score recompute
  3. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  4. 2026-09-28 21:38 UTCEG score recompute
  5. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  6. 2026-09-27 16:00 UTCEG score recompute
  7. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-09-27 03:17 UTCEG score recompute
  9. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-09-24 19:42 UTCEG score recompute
  11. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-09-23 20:05 UTCEG score recompute
  13. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  14. 2026-09-22 20:22 UTCEG score recompute
  15. 2026-09-22 08:33 UTCEG score recompute
  16. 2026-09-20 20:50 UTCEG score recompute
  17. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  18. 2026-09-19 19:57 UTCEG score recompute
  19. 2026-09-18 20:20 UTCEG score recompute
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  21. 2026-09-18 00:08 UTCEG score recompute
  22. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  23. 2026-09-16 23:54 UTCEG score recompute
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-09-16 12:05 UTCEG score recompute
  26. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  27. 2026-09-15 12:25 UTCEG score recompute
  28. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  29. 2026-09-14 00:45 UTCEG score recompute
  30. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  31. 2026-09-13 01:08 UTCEG score recompute
  32. 2026-09-12 01:30 UTCEG score recompute
  33. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  34. 2026-09-11 13:42 UTCEG score recompute
  35. 2026-09-10 14:05 UTCEG score recompute
  36. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  37. 2026-09-09 01:59 UTCEG score recompute
  38. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  39. 2026-09-07 20:05 UTCEG score recompute
  40. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  41. 2026-09-06 20:27 UTCEG score recompute
  42. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  43. 2026-09-05 20:49 UTCEG score recompute
  44. 2026-09-04 21:11 UTCEG score recompute
  45. 2026-09-04 08:42 UTCEG score recompute
  46. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  47. 2026-09-02 21:11 UTCEG score recompute
  48. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  49. 2026-09-01 18:53 UTCEG score recompute
  50. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  51. 2026-09-01 06:55 UTCEG score recompute
  52. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  53. 2026-08-31 05:25 UTCEG score recompute
  54. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  55. 2026-08-30 05:47 UTCEG score recompute
  56. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  57. 2026-08-29 06:08 UTCEG score recompute
  58. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  59. 2026-08-27 18:35 UTCEG score recompute
  60. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  61. 2026-08-26 18:18 UTCEG score recompute
  62. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  63. 2026-08-25 18:29 UTCEG score recompute
  64. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  65. 2026-08-24 18:48 UTCEG score recompute
  66. 2026-08-23 07:22 UTCEG score recompute
  67. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  68. 2026-08-22 07:46 UTCEG score recompute
  69. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  70. 2026-08-20 20:20 UTCEG score recompute
  71. 2026-08-20 20:02 UTCEG score recompute
  72. 2026-08-20 17:34 UTCEG score recompute
  73. 2026-08-20 16:17 UTCEG score recomputeFirst assessed: 7.1 HIGH
  74. 2026-08-20 16:16 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-54616?
CVE-2026-54616 is a high-severity vulnerability; its CVE record was published on August 20, 2026. NanaZip is the 7-Zip derivative intended for the modern Windows experience. From version 1.0.88.0 until stable version 6.0.1698.0 and preview version 6.5.1742.0, the Lz4Decode function in NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHandler.cpp rejects only a zero return from LZ4decompresssafe…
When was the CVE record for CVE-2026-54616 published?
The CVE record for CVE-2026-54616 was published on August 20, 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 September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-54616 actively exploited?
CVE-2026-54616 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54616?
CVE-2026-54616 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54616?
A fix for CVE-2026-54616 is available: update to the fixed version the vendor names in its advisory.

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