CVE-2025-5896Public exploitNetwork attack vector

Service hang via quadratic CSS unit matching

Published Jun 9, 2025 · Updated Jun 10, 2025

Regular expression denial of service in O2Team Taro 4.1.0 through 4.1.1 allows remote authenticated users to hang CSS conversion. The CSS-to-React-Native transform applies unanchored px and rem expressions to attacker-controlled values, repeatedly rescanning long digit runs without matching units. A crafted stylesheet value drives excessive CPU use and freezes the consuming build or application process; the CNA assessment requires low privileges.

CVSS severity7.5
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in O2Team Taro 4.1.0 through 4.1.1 allows remote authenticated users to hang CSS conversion. The CSS-to-React-Native transform applies unanchored px and rem expressions to attacker-controlled values, repeatedly rescanning long digit runs without matching units. A crafted stylesheet value drives excessive CPU use and freezes the consuming build or application process; the CNA assessment requires low privileges.

The record

CVE
CVE-2025-5896
Published
Jun 9, 2025
Updated
Jun 10, 2025
Vendor
O2Team
Product
Taro
Classifications
CWE-1333, CWE-400, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2025Record 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=4.1.0
  2. Affected versionversion=4.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

O2Team · Taroversion=4.1.0; version=4.1.1

Published CVSS scores

4.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:N/A:P
4.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

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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