VulnSocial

CVE-2026-42010Disclosure(gnu / enterprise_linux)

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch gnu enterprise_linux systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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1.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-170CWE-626

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • enterprise_linux
  • gnutls
  • hardened_images
  • openshift_container_platform

Threat summary

  • Patch or workaround signal is available
  • 4 mentions across 4 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • General: 1 classified signal
  • Peaked 3d ago at 1 mentions (2026-05-07); latest day: 1
  • 4 total mentions across 4 days

Affected systems

Vendors
gnuredhat
Products
enterprise_linuxgnutlshardened_imagesopenshift_container_platform

7 versions affected across 4 products

Deep dive

Activity timeline4 mentions / 4d
00111Mentions · 2026-05-07: 1Mentions · 2026-05-12: 1Mentions · 2026-05-27: 1Mentions · 2026-06-03: 1Patch / Workaround · 2026-05-12: 1Technical Details · 2026-05-07: 1Technical Details · 2026-05-12: 1Technical Details · 2026-06-03: 105-0705-1205-2706-03
Signal classification3 categories
Disclosure
250.0%
Patch
125.0%
General
125.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-05-071
Disclosure1
2026-05-121
Patch1
2026-05-271
General1
2026-06-031
Disclosure1
Full discourse4 posts
  • إبراهيم بوحيمد | Ibrahim Buhaimed@buhaimedi
    General

    صدرت اليوم ٨ ثغرات بتصنيف حرج او عالي الخطورة في مكتبة GnuTLS الي شرحتها في التغريده المقتبسه ـ📍 (CVE-2026-42010) تقييم (NVD): 🔴 9.8 (حرجة) تقييم (Red Hat): 🟠 7.1 (عالية) ـ📍 (CVE-2026-33845) تقييم (NVD): 🔴 9.1 (حرجة) تقييم (Red Hat): 🟠 7.5 (عالية) ـ📍 (CVE-2026-42013) تقييم (Red Hat): 🟠 8.2 (عالية) تصنيف (GnuTLS) الرسمي: 🟡 (متوسطة) ـ📍 (CVE-2026-5260) تقييم (Red Hat): 🟠 8.2 (عالية) ـ📍 (CVE-2026-33846) تقييم (Red Hat): 🟠 7.5 (عالية) ـ📍 (CVE-2026-42009) تقييم (Red Hat): 🟠 7.5 (عالية) ـ📍 (CVE-2026-3833) تقييم (NVD): 🟠 7.4 (عالية) تقييم (Red Hat): 🟡 6.5 (متوسطة) ـ📍 (CVE-2026-42011) تقييم (Red Hat / Ubuntu CVSS): 🟠 7.4 (عالية) أولوية (Ubuntu) الفعلية: 🟡 (متوسطة)

    Post summary

    The post merely announces eight critical or high‑severity GnuTLS CVEs with their CVSS ratings, without providing any proof‑of‑concept, exploitation tools, active use claims, remediation guidance, or technical details.

    03023124.3K
    50.0K followersView on X
  • iototsecnews@iototsecnews
    Patch

    GnuTLS 3.8.13 リリース：認証バイパスとメモリ破損を含む複数の脆弱性を修正 https://iototsecnews.jp/2026/05/05/gnutls-3-8-13-released-with-fix-for-12-vulnerabilities-affecting-network-communications/ 今回のアップデートでは、メモリ管理の不備や認証処理のロジックミスを原因とする脆弱性が修正されています。具体的には、メモリの境界チェックが不足していたために発生する、CVE-2026-33846 や CVE-2026-33845 などのヒープ関連の脆弱性が修正されています。また、ユーザー名処理の不備からログインを許してしまう CVE-2026-42010 などの、プログラムが想定外の入力に対して正しく振る舞えない問題も対処されています。特に、DTLS の実装や証明書検証 (CVE-2026-42013) といった通信の根幹に関わる部分で、境界値の確認やポインタの扱い、名前の照合ルールが不十分であったことが、深刻なリスクを生むきっかけとなっています。ご利用のチームは、ご注意ください。 #CVE202633845 #CVE202633846 #CVE20263833 #CVE202642009 #CVE202642010 #CVE202642013 #CVE202642014 #CVE20265419 #GnuTLS #Vulnerability

    Post summary

    The text announces a new GnuTLS release that addresses multiple heap and authentication vulnerabilities, providing a patch but no evidence of active exploitation or PoC.

    01000113
    491 followersView on X
  • WindowsForum@windowsforum
    Disclosure

    🪟 CVE-2026-42010 GnuTLS auth bypass via NUL-in-username = your “Windows patching” checklist just grew a Linux-sized tail. Modern estates: one tiny byte, big trust fail. https://windowsforum.com/threads/cve-2026-42010-gnutls-auth-bypass-nul-byte-flaw-in-rsa-psk.422030/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #WindowsPatchManagement #GnutlsVulnerability #Cve202642010 #RsaPskAuthentication https://t.co/SwN2AZ1G1q

    Post summary

    The post announces a new GnuTLS authentication bypass (CVE‑2026‑42010) caused by a NUL byte in the username field, providing a brief technical description without revealing PoC, exploit code, or patch information.

    0000053
    1.1K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-42010 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 trun… https://www.cve.org/CVERecord?id=CVE-2026-42010

    Post summary

    A flaw in gnutls RSA‑PSK configuration allows improper username matching when a NUL character is present, but no PoC, exploit, patch, or active exploitation is reported.

    0000073
    57.4K followersView on X
CPE platform detail8 entries

8 of 8 entries

PartVendorProductVersionTarget SWTarget HW
Appgnugnutls---
OSredhatenterprise_linux10.0--
OSredhatenterprise_linux6.0--
OSredhatenterprise_linux7.0--
OSredhatenterprise_linux8.0--
OSredhatenterprise_linux9.0--
Appredhathardened_images---
Appredhatopenshift_container_platform4.0--

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