CVE•Published 2026-05-07•Modified 2026-07-23•0 articles on news•4 live references•NVD data

CVE-2026-42010Gnu · Gnutls

Vulnerability data via NVD (ingested)

CVSS v3.1

7.1

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 39% of all CVEs

Weaknesses (CWE)

CWE-170Improper Null Termination CWE-626Null Byte Interaction Error (Poison Null Byte)

Description

A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.

Timeline

Published 2026-05-07

Modified 2026-07-23

External references

NVD MITRE Exploit-DB VulnCheck

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-2026-42010

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Gnu Gnutls"

All exposed Gnu Gnutls instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Gnutls"

HTTP body or banner mentions "Gnutls" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-42010