How severe is CVE-2025-10148?

CVE-2025-10148 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2025-10148 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-10148?

CVE-2025-10148 affects Haxx Curl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-10148?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-10148 have an EU (EUVD) identifier?

Yes. CVE-2025-10148 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-29013.

When was CVE-2025-10148 published?

CVE-2025-10148 was published on 2025-09-12 and last updated on 2026-09-15.

CVE-2025-10148

CVE-2025-10148 is a medium-severity vulnerability in Haxx Curl with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-340.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-29013
Weakness: CWE-340
Affected product: Haxx Curl
Published: 2025-09-12
Last modified: 2026-09-15

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.

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.
How severe is CVE-2025-10148?: CVE-2025-10148 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2025-10148 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-10148?: CVE-2025-10148 affects Haxx Curl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-10148?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-10148 have an EU (EUVD) identifier?: Yes. CVE-2025-10148 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-29013.
When was CVE-2025-10148 published?: CVE-2025-10148 was published on 2025-09-12 and last updated on 2026-09-15.

References

Affected products (1)

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

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