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Vulnerabilities

Vulnerability · CVE-2025-10148

curl's WebSocket code did not update the 32-bit mask pattern for each new outgoing frame as the specification says.

Published Sep 12, 2025 · catalog updated Oct 19, 2026 · curl's WebSocket code did

Last checked Oct 27, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-10148. EPSS is 0.52%. Act only if a listed version of curl's WebSocket code did is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (curl's WebSocket code did).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.52%
Remediation
Advisory link
Affected products
cpe haxx/curl · vendor curl curl 8.12.0

curl's WebSocket code did not update the 32-bit mask pattern for each new outgoing frame as the specification says. Instead it used a fixed mask that persisted and was used throughout the entire connection. A predictable mask pattern allows for a malicious server to induce traffic between the two communicating parties that could be interpreted by an involved proxy (configured or transparent) as genuine, real, HTTP traffic with content and thereby poison its cache. That cached poisoned content could then be served to all users of that proxy.

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.

  • cpe haxx/curlversion unspecified
  • vendor curl curl 8.12.08.12.0

How to fix CVE-2025-10148

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-2025-10148. EPSS is 0.52%. Act only if a listed version of curl's WebSocket code did is installed.

Which versions are affected?

Compare what you have installed with curl curl 8.12.0 8.12.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-340. EPSS 0.52%. 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.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 12, 2025 · NIST NVD

    Detected

    curl's WebSocket code did not update the 32-bit mask pattern for each new outgoing frame as the specification says. Instead it used a fixed mask that persisted and was used throughout the entire connection. A predictable mask pattern allows for a malicious server to induce traffic between the two communicating parties that could be interpreted by an involved proxy (configured or transparent) as ge

  2. Oct 19, 2026 · NIST NVD

    Updated

    curl's WebSocket code did not update the 32-bit mask pattern for each new outgoing frame as the specification says. Instead it used a fixed mask that persisted and was used throughout the entire connection. A predictable mask pattern allows for a malicious server to induce traffic between the two communicating parties that could be interpreted by an involved proxy (configured or transparent) as ge

Sources

  • CVE.orgVulnerability recordCVE-2025-10148

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-10148

    30-day exploitation probability 0.52%

    first.org
  • EUVDVulnerability recordEUVD-2025-29013

    curl's WebSocket code did not update the 32-bit mask pattern for each new outgoing frame as the specification says. Instead it used a fixed mask that persisted and was used throughout the entire connection. A predictable mask pattern allows for a malicious server to induce traffi

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-2025-10148

    curl's WebSocket code did not update the 32-bit mask pattern for each new outgoing frame as the specification says. Instead it used a fixed mask that persisted and was used throughout the entire connection. A predictable mask pattern allows for a malicious server to induce traff

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 27, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 24, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 21, 2026
  • NIST NVDOct 19, 2026