CVE-2026-13608: curl — Exploit & Fix

Description

A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation.

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CVSS v3.1 Score

7.4

HIGH

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

EPSS — Exploit Prediction

0.0064

Probability of exploitation

0.49%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-923 CWE-923

Affected Products

Vendor	Product	Versions
haxx	curl	7.82.0 — 8.22.0

References

Advisories & Patches

https://curl.se/docs/CVE-2026-13608.html https://curl.se/docs/CVE-2026-13608.json

Exploits

https://hackerone.com/reports/3822248 https://hackerone.com/reports/3822248

Frequently Asked Questions

What is CVE-2026-13608? +

A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation. It has a CVSS v3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-13608? +

CVE-2026-13608 has a CVSS v3.1 score of 7.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0064, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-13608? +

CVE-2026-13608 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-2026-13608? +

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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