CVE-2026-55758

MEDIUMPre-NVD 6.96.9
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (39th 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
6.9EG
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: 0.5%CVSS: 6.9Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles, and more to the game. Prior to 1.120.0, the SSRF protection in projects/core/src/main/java/dan200/computercraft/core/apis/http/options/AddressPredicate.java blocks the RFC 6052 64:ff9b::/96 NAT64 prefix but omits the RFC 8215 64:ff9b:1::/48 local-use prefix. On a dual-stack server using RFC 8215 NAT64, an unauthenticated user who can execute Lua code can use http.request or http.websocket with an address under 64:ff9b:1::/48 to reach loopback, RFC 1918, cloud metadata, or internal API endpoints because PrivatePattern.matches() does not classify the mapped IPv6 address as private. This issue is fixed in version 1.120.0.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100

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)
Severity69% × 45%
The EG Score, 6.9 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
0.5%
EPSS %ILE
39th
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 27, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Aug 27, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

Incomplete fix for GHSA-5jh9-2h63-pw4q: RFC 8215 NAT64 prefix (64:ff9b:1::/96) bypasses SSRF protection · Advisory · cc-tweaked/CC-Tweaked · GitHub

https://github.com/cc-tweaked/CC-Tweaked/security/advisories/GHSA-2rrx-mch2-76cp
GitHub commit Patch Available

commit d1bfb2571d3b (cc-tweaked/CC-Tweaked)

Patch available: cc-tweaked/CC-Tweaked v1.20.1-1.120.0 (contains commit d1bfb2571d3b)

https://github.com/cc-tweaked/CC-Tweaked/commit/d1bfb2571d3bde55529fac50d8303b7404499ec0

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 55× 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 0.5% · 39th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 39th 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 0.5% · 39th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  9. 2026-10-10 05:39 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-09 07:16 UTCEG score recompute
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  13. 2026-10-08 08:17 UTCEG score recompute
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  15. 2026-10-07 10:02 UTCEG score recompute
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  17. 2026-10-06 11:46 UTCEG score recompute
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  19. 2026-10-05 13:28 UTCEG score recompute
  20. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  21. 2026-10-03 16:34 UTCEG score recompute
  22. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  23. 2026-10-02 18:21 UTCEG score recompute
  24. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  25. 2026-10-01 19:52 UTCEG score recompute
Show 62 more
  1. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  2. 2026-09-30 19:54 UTCEG score recompute
  3. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  4. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  5. 2026-09-29 14:14 UTCEG score recompute
  6. 2026-09-28 15:14 UTCEG score recompute
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  8. 2026-09-27 16:55 UTCEG score recompute
  9. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-09-26 18:41 UTCEG score recompute
  11. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-09-24 18:45 UTCEG score recompute
  13. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-09-23 19:54 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-09-22 20:57 UTCEG score recompute
  17. 2026-09-21 22:43 UTCEG score recompute
  18. 2026-09-21 00:30 UTCEG score recompute
  19. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  20. 2026-09-20 02:16 UTCEG score recompute
  21. 2026-09-19 04:02 UTCEG score recompute
  22. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  23. 2026-09-18 05:48 UTCEG score recompute
  24. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-09-17 07:34 UTCEG score recompute
  26. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  27. 2026-09-16 09:21 UTCEG score recompute
  28. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  29. 2026-09-15 11:07 UTCEG score recompute
  30. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  31. 2026-09-14 12:21 UTCEG score recompute
  32. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  33. 2026-09-12 15:54 UTCEG score recompute
  34. 2026-09-11 17:41 UTCEG score recompute
  35. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  36. 2026-09-10 19:27 UTCEG score recompute
  37. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  38. 2026-09-09 01:30 UTCEG score recompute
  39. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  40. 2026-09-08 03:16 UTCEG score recompute
  41. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  42. 2026-09-07 05:02 UTCEG score recompute
  43. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  44. 2026-09-06 06:48 UTCEG score recompute
  45. 2026-09-05 08:35 UTCEG score recompute
  46. 2026-09-04 10:20 UTCEG score recompute
  47. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  48. 2026-09-03 12:07 UTCEG score recompute
  49. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  50. 2026-09-01 15:25 UTCEG score recompute
  51. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  52. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  53. 2026-08-31 17:12 UTCEG score recompute
  54. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  55. 2026-08-30 17:13 UTCEG score recompute
  56. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  57. 2026-08-29 18:59 UTCEG score recompute
  58. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  59. 2026-08-28 20:43 UTCEG score recompute
  60. 2026-08-27 20:27 UTCEG score recompute
  61. 2026-08-27 20:16 UTCEG score recomputeFirst assessed: 6.9 MEDIUM
  62. 2026-08-27 20:13 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55758?
CVE-2026-55758 is a medium-severity vulnerability; its CVE record was published on August 27, 2026. CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles, and more to the game. Prior to 1.120.0, the SSRF protection in projects/core/src/main/java/dan200/computercraft/core/apis/http/options/AddressPredicate.java blocks the RFC 6052 64:ff9b::/96 NAT64 prefix but omits the RFC…
When was the CVE record for CVE-2026-55758 published?
The CVE record for CVE-2026-55758 was published on August 27, 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 9, 2026; the record at its source may have been updated since.
Is CVE-2026-55758 actively exploited?
CVE-2026-55758 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55758?
CVE-2026-55758 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55758?
A fix for CVE-2026-55758 is available: update to the fixed version the vendor names in its advisory.

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