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CVE-2026-33846— Gnutls: gnutls: denial of service via heap buffer overflow in dtls handshake fragment reassembly

Quick assessment

Affected

Red Hat Red Hat Enterprise Linux 10

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GnuTLS是GnuTLS开源的一款免费的用于实现SSL、TLS和DTLS协议的安全通信库。 GnuTLS存在安全漏洞，该漏洞源于DTLS握手片段重组逻辑中merge_handshake_packet函数未验证message_length字段一致性，导致堆缓冲区溢出，可能导致应用崩溃或内存损坏。

CVSS 7.5 · High EPSS 1.12% · P65 Updated Oct 02, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application

Affected Version Matrix 48

Vendor	Product	Version Range	Status
Red Hat	Cert Manager support for Red Hat OpenShift release 1.20	`1790598593< *`	unaffected
Red Hat	Red Hat AI Inference Server 3.2	`1782951051< *`	unaffected
		`1782951012< *`	unaffected
		`1782951244< *`	unaffected
Red Hat	Red Hat Discovery 2	`1782159791< *`	unaffected
		`1782166952< *`	unaffected
Red Hat	Red Hat Enterprise Linux 10	`0:3.8.10-4.el10_2< *`	unaffected
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	`0:3.8.9-9.el10_0.19< *`	unaffected
Red Hat	Red Hat Enterprise Linux 6	`any`	unaffected
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	`0:3.3.29-9.el7_9.1< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8	`0:3.6.16-8.el8_10.6< *`	unaffected
		`0:3.6.16-8.el8_10.6< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	`0:3.6.14-10.el8_4.1< *`	unaffected
		`0:4.13-3.el8_4.1< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	`0:3.6.14-10.el8_4.1< *`	unaffected
		`0:4.13-3.el8_4.1< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	`0:3.6.16-5.el8_6.5< *`	unaffected
		`0:4.13-3.el8_6.2< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	`0:3.6.16-5.el8_6.5< *`	unaffected
		`0:4.13-3.el8_6.2< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	`0:3.6.16-7.el8_8.4< *`	unaffected
		`0:4.13-4.el8_8.1< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	`0:3.6.16-7.el8_8.4< *`	unaffected
		`0:4.13-4.el8_8.1< *`	unaffected
Red Hat	Red Hat Enterprise Linux 9	`0:3.8.10-4.el9_8< *`	unaffected
		`0:3.8.10-4.el9_8< *`	unaffected
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	`0:3.7.6-21.el9_2.7< *`	unaffected
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	`0:3.8.3-4.el9_4.6< *`	unaffected
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	`0:3.8.3-6.el9_6.4< *`	unaffected
Red Hat	Red Hat Hardened Images	`3.8.13-1.hum1< *`	unaffected
Red Hat	Red Hat OpenShift AI 3.4	`1790703542< *`	unaffected
Red Hat	Red Hat OpenShift Container Platform 4	`any`	unknown
		`any`	affected
Red Hat	Red Hat OpenShift Container Platform 4.12	`412.86.202608241157-0< *`	unaffected
Red Hat	Red Hat OpenShift Container Platform 4.13	`413.92.202609080414-0< *`	unaffected
Red Hat	Red Hat OpenShift Container Platform 4.14	`414.92.202608172040-0< *`	unaffected
Red Hat	Red Hat OpenShift Container Platform 4.15	`415.92.202608180329-0< *`	unaffected
Red Hat	Red Hat OpenShift Container Platform 4.16	`416.94.202608150307-0< *`	unaffected
Red Hat	Red Hat OpenShift Container Platform 4.17	`417.94.202608250221-0< *`	unaffected
Red Hat	Red Hat OpenShift Container Platform 4.18	`418.94.202608142238-0< *`	unaffected
Red Hat	Red Hat OpenShift Container Platform 4.19	`4.19.9.6.202608182320-0< *`	unaffected
Red Hat	Red Hat Update Infrastructure 5	`1781525684< *`	unaffected
		`1781525671< *`	unaffected
		`1781525693< *`	unaffected
		`1781525739< *`	unaffected
		`1787241211< *`	unaffected
		`1787135742< *`	unaffected
		`1787241260< *`	unaffected

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I. Basic Information for CVE-2026-33846

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Vulnerability Title

Gnutls: gnutls: denial of service via heap buffer overflow in dtls handshake fragment reassembly

Source: CVE Program / CVE List V5

Vulnerability Description

A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in merge_handshake_packet() where incoming handshake fragments are matched and merged based solely on handshake type, without validating that the message_length field remains consistent across all fragments of the same logical message. An attacker can exploit this by sending crafted DTLS fragments with conflicting message_length values, causing the implementation to allocate a buffer based on a smaller initial fragment and subsequently write beyond its bounds using larger, inconsistent fragments. Because the merge operation does not enforce proper bounds checking against the allocated buffer size, this results in an out-of-bounds write on the heap. The vulnerability is remotely exploitable without authentication via the DTLS handshake path and can lead to application crashes or potential memory corruption.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

长度参数不一致性处理不恰当

Source: CVE Program / CVE List V5

Vulnerability Title

GnuTLS 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat Enterprise Linux 10	0:3.8.10-4.el10_2 ~ *	`cpe:/o:redhat:enterprise_linux:10.2`
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	0:3.8.9-9.el10_0.19 ~ *	`cpe:/o:redhat:enterprise_linux_eus:10.0`
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	0:3.3.29-9.el7_9.1 ~ *	`cpe:/o:redhat:rhel_els:7`
Red Hat	Red Hat Enterprise Linux 8	0:3.6.16-8.el8_10.6 ~ *	`cpe:/a:redhat:enterprise_linux:8::appstream`
Red Hat	Red Hat Enterprise Linux 8	0:3.6.16-8.el8_10.6 ~ *	`cpe:/a:redhat:enterprise_linux:8::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	0:3.6.14-10.el8_4.1 ~ *	`cpe:/a:redhat:rhel_aus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	0:4.13-3.el8_4.1 ~ *	`cpe:/a:redhat:rhel_aus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	0:3.6.14-10.el8_4.1 ~ *	`cpe:/a:redhat:rhel_aus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	0:4.13-3.el8_4.1 ~ *	`cpe:/a:redhat:rhel_aus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	0:3.6.16-5.el8_6.5 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	0:4.13-3.el8_6.2 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	0:3.6.16-5.el8_6.5 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	0:4.13-3.el8_6.2 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	0:3.6.16-7.el8_8.4 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	0:4.13-4.el8_8.1 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	0:3.6.16-7.el8_8.4 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	0:4.13-4.el8_8.1 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 9	0:3.8.10-4.el9_8 ~ *	`cpe:/a:redhat:enterprise_linux:9::appstream`
Red Hat	Red Hat Enterprise Linux 9	0:3.8.10-4.el9_8 ~ *	`cpe:/a:redhat:enterprise_linux:9::appstream`
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	0:3.7.6-21.el9_2.7 ~ *	`cpe:/a:redhat:rhel_e4s:9.2::appstream`
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	0:3.8.3-4.el9_4.6 ~ *	`cpe:/a:redhat:rhel_e4s:9.4::appstream`
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	0:3.8.3-6.el9_6.4 ~ *	`cpe:/a:redhat:rhel_eus:9.6::appstream`
Red Hat	Red Hat OpenShift Container Platform 4.12	412.86.202608241157-0 ~ *	`cpe:/a:redhat:openshift:4.12::el8`
Red Hat	Red Hat OpenShift Container Platform 4.13	413.92.202609080414-0 ~ *	`cpe:/a:redhat:openshift:4.13::el9`
Red Hat	Red Hat OpenShift Container Platform 4.14	414.92.202608172040-0 ~ *	`cpe:/a:redhat:openshift:4.14::el9`
Red Hat	Red Hat OpenShift Container Platform 4.15	415.92.202608180329-0 ~ *	`cpe:/a:redhat:openshift:4.15::el9`
Red Hat	Red Hat OpenShift Container Platform 4.16	416.94.202608150307-0 ~ *	`cpe:/a:redhat:openshift:4.16::el9`
Red Hat	Red Hat OpenShift Container Platform 4.17	417.94.202608250221-0 ~ *	`cpe:/a:redhat:openshift:4.17::el9`
Red Hat	Red Hat OpenShift Container Platform 4.18	418.94.202608142238-0 ~ *	`cpe:/a:redhat:openshift:4.18::el9`
Red Hat	Red Hat OpenShift Container Platform 4.19	4.19.9.6.202608182320-0 ~ *	`cpe:/a:redhat:openshift:4.19::el9`

II. Public POCs for CVE-2026-33846

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-33846

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Vendor Advisories for CVE-2026-33846 (26)

🔗 cve-details vdb-entry x_refsource_REDHAT
🔗 2450625 – (CVE-2026-33846) CVE-2026-33846 gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly issue-tracking x_refsource_REDHAT
🔗 RHSA-2026:36004 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:36006 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:56911 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:20612 - Security Advisory - Portail Client Red Hat vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:59831 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:65839 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:26319 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:58981 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:20613 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:57483 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:32962 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:13274 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:34372 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:74674 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:56853 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:72502 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:33125 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:41921 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:57402 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:36005 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:56786 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:30849 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:60019 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:30850 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT

Other References for CVE-2026-33846 (4)

https://access.redhat.com/errata/RHSA-2026:20611 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26409 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29197 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30004 vendor-advisory x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-33846

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10

Same vendor: Red Hat

Same weakness: CWE-130

V. Comments for CVE-2026-33846

No comments yet

Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-33846— Gnutls: gnutls: denial of service via heap buffer overflow in dtls handshake fragment reassembly

Quick assessment

Possible ATT&CK Techniques 2 AI

Affected Version Matrix 48

I. Basic Information for CVE-2026-33846

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-33846

III. Intelligence Information for CVE-2026-33846

Vendor Advisories for CVE-2026-33846 (26)

Other References for CVE-2026-33846 (4)

IV. Related Vulnerabilities

V. Comments for CVE-2026-33846

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