CVE-2026-78181Public exploitNetwork attack vector

Prototype pollution via unfiltered keypath segments

Published Aug 24, 2026 · Updated Aug 24, 2026

Prototype pollution in Ractive 1.4.0 through 1.4.4 allows remote attackers to modify shared object prototypes via crafted keypaths. Ractive#set accepts proto, constructor, and prototype as path segments, and Model.applyValue assigns values through parentValue[this.key]. Exploitation requires a consuming application to pass attacker-influenced keypaths; polluted template or data properties can inject rendered HTML, while overwritten built-ins can crash the process.

CVSS severity7.3
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in Ractive 1.4.0 through 1.4.4 allows remote attackers to modify shared object prototypes via crafted keypaths. Ractive#set accepts proto, constructor, and prototype as path segments, and Model.applyValue assigns values through parentValue[this.key]. Exploitation requires a consuming application to pass attacker-influenced keypaths; polluted template or data properties can inject rendered HTML, while overwritten built-ins can crash the process.

The record

CVE
CVE-2026-78181
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
Ractive.js
Product
Ractive
Classifications
CWE-94, CWE-1321, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.4.0
  2. Affected versionversion=1.4.1
  3. Affected versionversion=1.4.2
  4. Affected versionversion=1.4.3
  5. Affected versionversion=1.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ractive.js · Ractiveversion=1.4.0; version=1.4.1; version=1.4.2; version=1.4.3; version=1.4.4

Published CVSS scores

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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