CVE-2026-55783

LOWPre-NVD 2.42.4
EchelonGraph scoreMEDIUM confidence

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

This low-severity CVE scores 2.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (4th 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
2.4EG
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: 0.2%CVSS: 2.4Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0.

CVSS v3
2.4
EG Score
2.4LOWmedium confidence
EG Risk
27
EG Risk 27/100

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)
Severity24% × 45%
The EG Score, 2.4 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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

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

The CVE record names the fixed release. 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

July 10, 2026

Last Modified

July 10, 2026

References (3)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 32× 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.

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. 3 repeat rows among the latest 99 are merged into the row they repeat.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 4th percentile
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  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  14. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  15. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  17. 2026-10-01 16:00 UTCEG score recompute
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  19. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  21. 2026-09-28 09:48 UTCEG score recompute
  22. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  23. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  24. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-09-23 05:45 UTCEG score recompute
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  1. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  2. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  3. 2026-09-18 05:18 UTCEG score recompute
  4. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  5. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  6. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  7. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-09-12 02:57 UTCEG score recompute
  10. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  12. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  13. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-09-05 21:44 UTCEG score recompute
  15. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  16. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  17. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  18. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  19. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  20. 2026-08-30 06:24 UTCEG score recompute
  21. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  22. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  23. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  24. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  26. 2026-08-24 23:10 UTCEG score recompute
  27. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  28. 2026-08-21 16:58 UTCEG score recompute
  29. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  30. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  31. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  32. 2026-08-18 10:40 UTCEG score recompute
  33. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  34. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  35. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  36. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  37. 2026-08-15 01:28 UTCEG score recompute
  38. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  39. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  40. 2026-08-11 19:16 UTCEG score recompute
  41. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  42. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  43. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  44. 2026-08-08 13:04 UTCEG score recompute
  45. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  46. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  47. 2026-08-05 06:51 UTCEG score recompute
  48. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  49. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  50. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  51. 2026-08-02 00:38 UTCEG score recompute
  52. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  53. 2026-07-29 18:25 UTCEG score recompute
  54. 2026-07-28 15:37 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  55. 2026-07-26 12:10 UTCEG score recompute
  56. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  57. 2026-07-24 14:18 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  58. 2026-07-23 03:20 UTCEG score recompute
  59. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  60. 2026-07-21 15:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  61. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  62. 2026-07-19 14:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  63. 2026-07-19 02:29 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  64. 2026-07-18 10:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  65. 2026-07-16 17:03 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  66. 2026-07-15 16:57 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  67. 2026-07-13 22:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  68. 2026-07-13 06:13 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  69. 2026-07-12 05:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  70. 2026-07-10 17:13 UTCEG score recompute
  71. 2026-07-10 17:12 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55783?
CVE-2026-55783 is a low-severity vulnerability; its CVE record was published on July 10, 2026. NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing…
When was the CVE record for CVE-2026-55783 published?
The CVE record for CVE-2026-55783 was published on July 10, 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 July 10, 2026; the record at its source may have been updated since.
Is CVE-2026-55783 actively exploited?
CVE-2026-55783 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55783?
CVE-2026-55783 has a CVSS base score of 2.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55783?
The CVE record for CVE-2026-55783 names the fix: "This issue is fixed in version 6.5.1749.0."

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