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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.

PUBLISHED Reserved 2026-04-23 | Published 2026-05-07 | Updated 2026-05-07 | Assigner redhat




HIGH: 7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Product status

Default status
affected

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affected

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affected

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affected

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affected

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affected

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affected

Timeline

2026-05-06:Reported to Red Hat.
2026-04-29:Made public.

Credits

Red Hat would like to thank Joshua Rogers (AISLE Research Team) for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-42010 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2467289 (RHBZ#2467289) issue-tracking

cve.org (CVE-2026-42010)

nvd.nist.gov (CVE-2026-42010)

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