Medium 5.3Published Sep 12, 2025

CVE-2025-10148curl's WebSocket code did not update the 32-bit mask pattern for each new outgoing frame as the specification says.

Updated under an hour ago (2026-10-23 05:23 UTC)

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It affects haxx curl. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-340
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

haxx curl haxx:curl	from 8.11.0 before 8.16.0	NVD

References

https://curl.se/docs/CVE-2025-10148.htmlpatch, vendor-advisory
https://curl.se/docs/CVE-2025-10148.jsonvendor-advisory
https://hackerone.com/reports/3330839issue-tracking, third-party-advisory
http://www.openwall.com/lists/oss-security/2025/09/10/2mailing-list, patch, third-party-advisory
http://www.openwall.com/lists/oss-security/2025/09/10/3mailing-list, third-party-advisory
http://www.openwall.com/lists/oss-security/2025/09/10/4mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.