CVE-2026-55451

HIGHPre-NVD 8.38.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 65% 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
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.3Exploit: Elevated riskExposed: 0

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

gettext-converter provides gettext resource conversion utilities for JavaScript. Prior to 1.3.3, js2i18next() in lib/js2i18next.js splits nested translation keys using options.keyseparator, whose default value consists of two number signs, and uses each segment as a dynamic object key without rejecting __proto__, constructor, or prototype. When an application converts untrusted PO or i18next translation data, a __proto__ segment resolves Object.prototype as the nested write target and Object.assign writes attacker-controlled translated properties onto the process-wide prototype. The resulting prototype pollution can cause denial of service and may enable application-dependent follow-on attacks. This issue is fixed in version 1.3.3.

CVSS v3
8.3
EG Score
8.3(medium)
EG Risk
68(Attend)
EG Risk 68/100SSVC: Attend

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
Severity83% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

August 20, 2026

Last Modified

September 14, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
Patch available. Sources: github_commit, github.
github_commit

commit df90c3b93e51 (locize/gettext-converter)

Fix landed in locize/gettext-converter commit df90c3b93e51 — awaiting tagged release

https://github.com/locize/gettext-converter/commit/df90c3b93e51faef68891d97b626544f619c5b31
generic

Prototype pollution in `js2i18next()` via `__proto__` translation key · Issue #15 · locize/gettext-converter · GitHub

https://github.com/locize/gettext-converter/issues/15
github Patch Available

Prototype pollution in js2i18next() via crafted translation keys · Advisory · locize/gettext-converter · GitHub

https://github.com/locize/gettext-converter/security/advisories/GHSA-f4jp-rw7w-ccwg

Vendor Advisories for CVE-2026-55451(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 rangeFixed inDependents
gettext-converter—1.3.3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 15× 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. 2026-09-19 18:28 UTCEG score recompute
  2. 2026-09-18 19:38 UTCEG score recompute
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 21:19 UTCEG score recompute
  5. 2026-09-17 19:31 UTCEPSS rescore
  6. 2026-09-16 19:44 UTCEG score recompute
  7. 2026-09-16 14:08 UTCEPSS rescore
  8. 2026-09-16 05:56 UTCEG score recompute
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 06:31 UTCEG score recompute
  11. 2026-09-14 19:23 UTCEG score recompute
  12. 2026-09-14 19:05 UTCEG score recompute
  13. 2026-09-14 17:55 UTCEG score recompute
  14. 2026-09-14 17:00 UTCEG score recompute▲ 8.30
  15. 2026-09-14 16:59 UTCMITRE cvelistV5CVSS v3 → 8.3 · CVSS v4 → 8.3 · severity → HIGH
  16. 2026-08-20 20:42 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55451?
CVE-2026-55451 is a high vulnerability published on August 20, 2026. gettext-converter provides gettext resource conversion utilities for JavaScript. Prior to 1.3.3, js2i18next() in lib/js2i18next.js splits nested translation keys using options.keyseparator, whose default value consists of two number signs, and uses each segment as a dynamic object key without…
When was CVE-2026-55451 disclosed?
CVE-2026-55451 was first published in the National Vulnerability Database on August 20, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55451 actively exploited?
CVE-2026-55451 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 64.7% of all scored CVEs.
What is the CVSS score of CVE-2026-55451?
CVE-2026-55451 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2026-55451?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55451, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-55451

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