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: 0.1%, top 99% of all CVEs by exploit prediction. 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
Trending — 3 sources updated this weekElevated
5.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.0Exploit: NoneExposed: 0

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

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
5.0(medium)
EPSS
0.8%
KEV
Not listed

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.
github Patch Available🟡 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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 11× 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.

  1. 2026-07-12 07:56 UTCEG score recompute
  2. 2026-07-12 05:46 UTCEPSS rescore
  3. 2026-07-11 09:54 UTCEG score recompute
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-11 08:27 UTCEPSS rescore
  6. 2026-07-10 11:52 UTCEG score recompute
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-09 13:49 UTCEG score recompute
  10. 2026-07-08 15:46 UTCEG score recompute
  11. 2026-07-08 15:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database 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 0.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-57439?
CVE-2026-57439 has a CVSS v3 base score of 5.0 (NVD).
How do I remediate CVE-2026-57439?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57439, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-57439

Explore →

Is Your Infrastructure Affected by CVE-2026-57439?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs