FKIE_CVE-2026-33846
Vulnerability from fkie_nvd - Published: 2026-05-04 10:15 - Updated: 2026-07-02 12:17
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
Impacted products
| Vendor | Product | Version |
|---|
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"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat",
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{
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"cpes": [
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"packageName": "gnutls",
"product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
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{
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}
]
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{
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{
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"cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
],
"defaultStatus": "affected",
"packageName": "gnutls",
"product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
"vendor": "Red Hat",
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"version": "0:3.6.14-10.el8_4.1",
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"cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
"cpe:/o:redhat:rhel_aus:8.4::baseos",
"cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
],
"defaultStatus": "affected",
"packageName": "gnutls",
"product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
"vendor": "Red Hat",
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{
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"cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
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"cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
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{
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"product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
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"vendor": "Red Hat",
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}
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"cpe:/a:redhat:rhel_eus_long_life:8.6::appstream",
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"cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
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"product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
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"cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
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}
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"cpe:/a:redhat:rhel_tus:8.8::appstream",
"cpe:/o:redhat:rhel_e4s:8.8::baseos",
"cpe:/o:redhat:rhel_tus:8.8::baseos"
],
"defaultStatus": "affected",
"packageName": "gnutls",
"product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
"vendor": "Red Hat",
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{
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"cpe:/a:redhat:rhel_tus:8.8::appstream",
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"cpe:/o:redhat:rhel_tus:8.8::baseos"
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{
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"cpe:/o:redhat:rhel_e4s:8.8::baseos",
"cpe:/o:redhat:rhel_tus:8.8::baseos"
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"packageName": "libtasn1",
"product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
"vendor": "Red Hat",
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{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
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"cpe:/o:redhat:enterprise_linux:9::baseos"
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"defaultStatus": "affected",
"packageName": "gnutls",
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{
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{
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},
{
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},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:discovery:2::el9"
],
"defaultStatus": "affected",
"packageName": "discovery/discovery-server-rhel9",
"product": "Red Hat Discovery 2",
"vendor": "Red Hat",
"versions": [
{
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]
},
{
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],
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"vendor": "Red Hat",
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{
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},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "affected",
"packageName": "gnutls-main",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat",
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},
{
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"cpes": [
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],
"defaultStatus": "affected",
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"vendor": "Red Hat",
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},
{
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"cpes": [
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"product": "Red Hat Update Infrastructure 5",
"vendor": "Red Hat",
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},
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"product": "Red Hat Update Infrastructure 5",
"vendor": "Red Hat",
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{
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{
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"cpes": [
"cpe:/o:redhat:enterprise_linux:6"
],
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"packageName": "gnutls",
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"vendor": "Red Hat"
},
{
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"cpes": [
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],
"defaultStatus": "affected",
"packageName": "rhcos",
"product": "Red Hat OpenShift Container Platform 4",
"vendor": "Red Hat"
}
],
"source": "secalert@redhat.com"
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{
"affectedData": [
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],
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"vendor": "Red Hat"
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{
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"vendor": "Red Hat"
},
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},
{
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],
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"vendor": "Red Hat"
},
{
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"cpe:/a:redhat:rhel_aus:8.4::appstream"
],
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
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},
{
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],
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"product": "Red Hat Enterprise Linux AppStream E4S (v.8.8)",
"vendor": "Red Hat"
},
{
"cpes": [
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],
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"product": "Red Hat Enterprise Linux AppStream TUS (v.8.8)",
"vendor": "Red Hat"
},
{
"cpes": [
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],
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"product": "Red Hat Enterprise Linux AppStream E4S (v.9.4)",
"vendor": "Red Hat"
},
{
"cpes": [
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],
"defaultStatus": "affected",
"product": "Red Hat Enterprise Linux AppStream EUS (v.9.6)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:enterprise_linux:9::appstream"
],
"defaultStatus": "affected",
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"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux_eus:10.0"
],
"defaultStatus": "affected",
"product": "Red Hat Enterprise Linux BaseOS EUS (v. 10.0)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux:10.2"
],
"defaultStatus": "affected",
"product": "Red Hat Enterprise Linux BaseOS (v. 10)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux:8::baseos"
],
"defaultStatus": "affected",
"product": "Red Hat Enterprise Linux BaseOS (v. 8)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:rhel_aus:8.4::baseos"
],
"defaultStatus": "affected",
"product": "Red Hat Enterprise Linux BaseOS AUS (v.8.4)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
],
"defaultStatus": "affected",
"product": "Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:rhel_aus:8.6::baseos"
],
"defaultStatus": "affected",
"product": "Red Hat Enterprise Linux BaseOS AUS (v.8.6)",
"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:rhel_e4s:8.8::baseos"
],
"defaultStatus": "affected",
"product": "Red Hat Enterprise Linux BaseOS E4S (v.8.8)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:rhel_tus:8.8::baseos"
],
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{
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{
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{
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{
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{
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],
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],
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{
"lang": "en",
"value": "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."
}
],
"id": "CVE-2026-33846",
"lastModified": "2026-07-02T12:17:07.043",
"metrics": {
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{
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"attackVector": "NETWORK",
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"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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},
{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-04T12:46:44.977536Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-05-04T10:15:59.690",
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{
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{
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"vulnStatus": "Awaiting Analysis",
"weaknesses": [
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"description": [
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"value": "CWE-130"
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],
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"type": "Secondary"
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{
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"value": "CWE-130"
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]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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