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High 7.1Published May 7, 2026

CVE-2026-42010Gnutls: gnutls: authentication bypass via nul character in username

Updated under an hour ago ()

Does this affect you?

It affects Red Hat Enterprise Linux 10 and 16 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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.

CVSS
7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness (CWE)
CWE-170, CWE-626
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
redhat
NVD analysis
Modified
Record last updated
Oct 26, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
from 0:3.8.10-4.el10_2 not affected
CNA record
from 0:3.8.9-9.el10_0.19 not affected
CNA record
from 0:3.6.14-10.el8_4.1 not affected
CNA record
from 0:3.6.14-10.el8_4.1 not affected
CNA record
from 0:3.6.16-7.el8_8.4 not affected
CNA record
from 0:3.6.16-7.el8_8.4 not affected
CNA record
from 0:3.8.3-6.el9_6.4 not affected
CNA record
from 412.86.202608241157-0 not affected
CNA record
from 1791371080 not affected
CNA record
Red Hat Red Hat AI Inference Server 3.2
redhat:ai_inference_server
from 1782951051 not affected
CNA record

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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