CVE-2026-1977

MEDIUMNVD 6.36.3
EchelonGraph scoreMEDIUM confidence

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

Score 6.3 from GitHub Security Advisory published 2026-02-06. NVD baseline CVSS 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Elevated
6.3EG
EchelonGraph verdictPlan mitigationRemediate 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: 0.3%CVSS: 6.3Exploit: No code on recordExposed services: Not assessed

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

A security vulnerability has been detected in isaacwasserman mcp-vegalite-server up to 16aefed598b8cd897b78e99b907f6e2984572c61. Affected by this vulnerability is the function eval of the component visualize_data. Such manipulation of the argument vegalite_specification leads to code injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. This product utilizes a rolling release system for continuous delivery, and as such, version information for affected or updated releases is not disclosed. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100

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)
Severity63% × 45%
The EG Score, 6.3 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: No fix is confirmed yet. Restrict network exposure of the affected system within your standard update timelines, and watch for a fix.
EPSS PROB
0.3%
EPSS %ILE
17th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system within your standard update timelines, and watch for a fix.

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

February 6, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Aug 7, 2026
No fix on record yet.
Web page

[CVE-2026-1977] Code Injection in mcp-vegalite-server · Issue #9 · isaacwasserman/mcp-vegalite-server · GitHub

https://github.com/isaacwasserman/mcp-vegalite-server/issues/9
Web page

GitHub - isaacwasserman/mcp-vegalite-server · GitHub

https://github.com/isaacwasserman/mcp-vegalite-server/

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 28× 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 93 of 192 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. 7 repeat rows among the latest 100 are merged into the row they repeat. The 99 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 17th percentile
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  5. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  6. 2026-10-12 16:25 UTCEG score recompute
  7. 2026-10-11 20:06 UTCEG score recompute
  8. 2026-10-11 17:19 UTCEG score recompute
  9. 2026-10-11 14:51 UTCEG score recompute
  10. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  11. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 17th percentile
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  14. 2026-10-08 16:54 UTCOSV refresh
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  17. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 17th percentile
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  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
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  1. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  2. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
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  6. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
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  8. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 14th percentile
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  11. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 13th percentile
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  29. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  30. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  31. 2026-08-14 11:03 UTCEG score recompute
  32. 2026-08-14 11:03 UTCGHSA enrichmentGHSA-rcq9-4v75-4fh5 · GitHub CVSS 6.3
  33. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  34. 2026-08-13 03:22 UTCEG score recompute
  35. 2026-08-13 03:22 UTCGHSA enrichmentGHSA-rcq9-4v75-4fh5 · GitHub CVSS 6.3
  36. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 13th percentile
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  38. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  39. 2026-08-09 15:42 UTCEG score recompute
  40. 2026-08-09 15:42 UTCGHSA enrichmentGHSA-rcq9-4v75-4fh5 · GitHub CVSS 6.3
  41. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  42. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  43. 2026-08-07 22:41 UTCEG score recompute
  44. 2026-08-07 22:41 UTCGHSA enrichmentGHSA-rcq9-4v75-4fh5 · GitHub CVSS 6.3
  45. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  46. 2026-08-06 04:18 UTCEG score recompute
  47. 2026-08-06 04:18 UTCGHSA enrichmentGHSA-rcq9-4v75-4fh5 · GitHub CVSS 6.3
  48. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
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  52. 2026-08-02 21:20 UTCEG score recompute
  53. 2026-08-02 21:20 UTCGHSA enrichmentGHSA-rcq9-4v75-4fh5 · GitHub CVSS 6.3
  54. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.2% · 13th percentile
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  62. 2026-07-23 03:06 UTCEG score recompute
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Frequently asked(5)

What is CVE-2026-1977?
CVE-2026-1977 is a medium-severity vulnerability; its CVE record was published on February 6, 2026. A security vulnerability has been detected in isaacwasserman mcp-vegalite-server up to 16aefed598b8cd897b78e99b907f6e2984572c61. Affected by this vulnerability is the function eval of the component visualizedata. Such manipulation of the argument vegalitespecification leads to code injection. The…
When was the CVE record for CVE-2026-1977 published?
The CVE record for CVE-2026-1977 was published on February 6, 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 17, 2026; the record at its source may have been updated since.
Is CVE-2026-1977 actively exploited?
CVE-2026-1977 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (17th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-1977?
CVE-2026-1977 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-1977?
No fix for CVE-2026-1977 is confirmed yet. Until one is published, restrict network exposure of the affected system — for example, keep it off the internet or limit it to trusted networks — and watch for a fix.

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