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Vulnerabilities

Threat intelligence · CVE-2025-59140

backlash parses collected strings with escapes.

Published Sep 15, 2025 · catalog updated Sep 16, 2025 · Qix-

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-59140. EPSS is 0.41%. Act only if a listed version of Qix- is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.41%
Remediation
Advisory link
Affected products
vendor Qix- node-backslash = 0.2.1

backlash parses collected strings with escapes. On 8 September 2025, the npm publishing account for backslash was taken over after a phishing attack. Version 0.2.1 was published, functionally identical to the previous patch version, but with a malware payload added attempting to redirect cryptocurrency transactions to the attacker's own addresses from within browser environments. Local environments, server environments, command line applications, etc. are not affected. If the package was used in a browser context (e.g. a direct inclusion, or via a bundling tool such as Babel, Rollup, Vite, Nex

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Qix- node-backslash = 0.2.1= 0.2.1

How to fix CVE-2025-59140

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-59140. EPSS is 0.41%. Act only if a listed version of Qix- is installed.

Which versions are affected?

Compare what you have installed with Qix- node-backslash = 0.2.1 = 0.2.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.41%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 15, 2025 · EUVD

    Detected

    backlash parses collected strings with escapes. On 8 September 2025, the npm publishing account for backslash was taken over after a phishing attack. Version 0.2.1 was published, functionally identical to the previous patch version, but with a malware payload added attempting to redirect cryptocurrency transactions to the attacker's own addresses from within browser environments. Local environment

  2. Sep 16, 2025 · EUVD

    Updated

    backlash parses collected strings with escapes. On 8 September 2025, the npm publishing account for backslash was taken over after a phishing attack. Version 0.2.1 was published, functionally identical to the previous patch version, but with a malware payload added attempting to redirect cryptocurrency transactions to the attacker's own addresses from within browser environments. Local environment

Sources

  • CVE.orgVulnerability recordCVE-2025-59140

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-59140

    30-day exploitation probability 0.41%

    first.org
  • EUVDVulnerability recordEUVD-2025-29229

    backlash parses collected strings with escapes. On 8 September 2025, the npm publishing account for backslash was taken over after a phishing attack. Version 0.2.1 was published, functionally identical to the previous patch version, but with a malware payload added attempting to

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • EUVDOct 23, 2026
  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026