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Fencer Intel
high 8.9

CVE-2025-27597 json

Vue I18n Prototype Pollution in `handleFlatJson`

published last yr. modified 2mo ago also GHSA-p2ph-7g93-hw3m , EUVD-2025-7792

cvss
8.9
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

Vue I18n is the internationalization plugin for Vue.js. @intlify/message-resolver and @intlify/vue-i18n-core are vulnerable to Prototype Pollution through the entry function: handleFlatJson. An attacker can supply a payload with Object.prototype setter to introduce or modify properties within the global prototype chain, causing denial of service (DoS) a the minimum consequence. Moreover, the consequences of this vulnerability can escalate to other injection-based attacks, depending on how the library integrates within the application. For instance, if the polluted property propagates to sensitive Node.js APIs (e.g., exec, eval), it could enable an attacker to execute arbitrary commands within the application's context.

Patch / fix

  • npm @intlify/message-resolver 9.1.11
  • npm @intlify/vue-i18n-core 9.14.3, 10.0.6, 11.1.2
  • npm petite-vue-i18n 10.0.6, 11.1.2
  • npm vue-i18n 9.14.3, 10.0.6, 11.1.2
  • npm @intlify/core-base 9.1.11
  • npm @intlify/core 9.1.11

Is CVE-2025-27597 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/intlify/vue-i18n/security/advisories/GHSA-p2ph-7g93-hw3m referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
CNA 4.0 8.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
npm @intlify/message-resolver
>=9.1.0, <9.1.11
9.1.11
npm @intlify/vue-i18n-core
>=9.2.0, <9.14.3
>=10.0.0-alpha.1, <10.0.6
>=11.0.0-beta.0, <11.1.2
9.14.3
10.0.6
11.1.2
npm petite-vue-i18n
>=10.0.0, <10.0.6
>=11.0.0-beta.0, <11.1.2
10.0.6
11.1.2
npm vue-i18n
>=9.1.0, <9.14.3
>=10.0.0-alpha.1, <10.0.6
>=11.0.0-beta.0, <11.1.2
9.14.3
10.0.6
11.1.2
npm @intlify/core-base
>=9.1.0, <9.1.11
9.1.11
npm @intlify/core
>=9.1.0, <9.1.11
9.1.11

Affected products

  • intlify vue-i18n

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.