CVE-2026-57439

MEDIUMPre-NVD 5.05.0—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (14th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.0Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts __proto__ as a key while parsing user-supplied CSV, allowing prototype pollution that can be chained with operations such as Parse UDP to inject malicious JavaScript into HTML output. This issue is fixed in version 11.2.0.

CVSS v3
5.0
EG Score
5.0MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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
Severity50% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
14th
KEV
Not listed

CISA SSVCTrack 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). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 8, 2026

Last Modified

July 10, 2026

Advisory Details (5)

Auto-updated Jul 8, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit, github_pr.
githubMentions a patch (unverified)🟡 PoC Available

Prototype pollution in Series Chart operation · Advisory · gchq/CyberChef · GitHub

https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c
github_release Patch Available

Release v11.2.0 (gchq/CyberChef)

Patch available: gchq/CyberChef v11.2.0

https://github.com/gchq/CyberChef/releases/tag/v11.2.0
github_pr Patch Available

Chart operation prototype protection

Patch available: gchq/CyberChef v11.2.0 (PR #2569 merged 2026-06-17)

https://github.com/gchq/CyberChef/pull/2569
generic🟡 PoC Available

Prototype pollution security vulnerability · Issue #2568 · gchq/CyberChef · GitHub

https://github.com/gchq/CyberChef/issues/2568
github_commit Patch Available

commit 85db3be5d009 (gchq/CyberChef)

Patch available: gchq/CyberChef v11.2.0 (contains commit 85db3be5d009)

https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f

Vendor Advisories for CVE-2026-57439(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
cyberchef—
  • every version up to 11.2.0: fixed in 11.2.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 118 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-57439?
CVE-2026-57439 is a medium vulnerability published on July 8, 2026. CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts proto as a key while parsing user-supplied CSV, allowing prototype pollution that can be chained with operations such as Parse UDP to inject malicious JavaScript into…
When was CVE-2026-57439 disclosed?
CVE-2026-57439 was first published on July 8, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57439 actively exploited?
CVE-2026-57439 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (14th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-57439?
CVE-2026-57439 has a CVSS base score of 5.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-57439?
A fix for CVE-2026-57439 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-57439 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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