Improper Handling of Length Parameter Inconsistency Affecting gnutls-debuginfo package, versions <0:3.8.3-8.amzn2023.0.3


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-AMZN2023-GNUTLSDEBUGINFO-16887599
  • published27 May 2026
  • disclosed4 May 2026

Introduced: 4 May 2026

NewCVE-2026-33846  (opens in a new tab)
CWE-130  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 gnutls-debuginfo to version 0:3.8.3-8.amzn2023.0.3 or higher.
This issue was patched in ALAS2023-2026-1757.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gnutls-debuginfo package and not the gnutls-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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 Base Scores

version 3.1