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High 7.5Published May 4, 2026

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

Updated under an hour ago ()

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It affects Red Hat Enterprise Linux 10 and 14 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS
7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-130
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
Awaiting Analysis
Record last updated
Oct 14, 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 0:3.3.29-9.el7_9.1 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
from 1782159791 not affected
CNA record
from 3.8.13-1.hum1 not affected
CNA record
from 1790703542 not affected
CNA record
from 1781525684 not affected
CNA record
from 0:3.8.10-4.el10_2 not affected
CISA ADP
from 0:3.8.9-9.el10_0.19 not affected
CISA ADP
from 0:3.3.29-9.el7_9.1 not affected
CISA ADP
from 0:3.6.14-10.el8_4.1 not affected
CISA ADP
from 0:3.6.14-10.el8_4.1 not affected
CISA ADP
from 0:3.6.16-7.el8_8.4 not affected
CISA ADP
from 0:3.6.16-7.el8_8.4 not affected
CISA ADP
from 0:3.8.3-6.el9_6.4 not affected
CISA ADP
from 412.86.202608241157-0 not affected
CISA ADP
Red Hat Red Hat AI Inference Server 3.2
redhat:ai_inference_server
from 1782951051 not affected
CISA ADP
from 1782159791 not affected
CISA ADP
from 3.8.13-1.hum1 not affected
CISA ADP
from 1781525684 not affected
CISA ADP

References

  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
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  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat
  • vendor-advisory, x-refsource-redhat

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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