CVE-2025-5025: curl Cert Validation Flaw

Description

libcurl supports *pinning* of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC and HTTP/3. Since pinning makes the transfer succeed if the pin is fine, users could unwittingly connect to an impostor server without noticing.

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CVSS v3.1 Score

4.8

MEDIUM

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

Weakness Type (CWE)

CWE-295 CWE-295

Affected Products

Vendor	Product	Versions
haxx	curl	8.5.0 — 8.14.0

References

Advisories & Patches

https://curl.se/docs/CVE-2025-5025.html https://curl.se/docs/CVE-2025-5025.json

Exploits

https://hackerone.com/reports/3153497

Other References

http://www.openwall.com/lists/oss-security/2025/05/28/5

Frequently Asked Questions

What is CVE-2025-5025? +

libcurl supports *pinning* of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC and HTTP/3. Since pinning makes the transfer succeed if the pin is fine, users could unwittingly connect to an impostor server without noticing. It has a CVSS v3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2025-5025? +

CVE-2025-5025 has a CVSS v3.1 score of 4.8 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-2025-5025? +

CVE-2025-5025 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-2025-5025? +

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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