CVE-2025-10148: curl — Fix

Description

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected Products

Vendor	Product	Versions
haxx	curl	8.11.0 — 8.16.0

References

Advisories & Patches

https://curl.se/docs/CVE-2025-10148.html https://curl.se/docs/CVE-2025-10148.json http://www.openwall.com/lists/oss-security/2025/09/10/2

Other References

https://hackerone.com/reports/3330839 http://www.openwall.com/lists/oss-security/2025/09/10/3 http://www.openwall.com/lists/oss-security/2025/09/10/4

Frequently Asked Questions

What is CVE-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 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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-10148? +

CVE-2025-10148 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-10148? +

CVE-2025-10148 affects products from haxx, specifically: curl. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-10148? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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