CVE•Published 2026-09-06•Modified 2026-09-11•1 article on news•4 live references•NVD data
CVE-2026-19931Haxx · Curl
Vulnerability data via NVD (ingested)
CVSS v3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
17
Exploit Prediction Scoring System · top 83% of all CVEs
Weaknesses (CWE)
Description
A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection.
Timeline
Published 2026-09-06
Modified 2026-09-11
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-19931Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Haxx Curl"All exposed Haxx Curl instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Curl"HTTP body or banner mentions "Curl" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-19931Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-19931Censys host search filtered to this CVE id.
grep.app
CVE-2026-19931Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-19931GitHub code search for direct mentions.
Google dork
"CVE-2026-19931" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.