Unauthenticated service crash via inconsistent DTLS fragments
Published May 4, 2026 · Updated Aug 31, 2026
Heap buffer overflow in GnuTLS DTLS reassembly allows remote attackers to crash applications via crafted handshake fragments. The merge_handshake_packet() path groups fragments only by handshake type, allocates from an initial smaller message_length, then copies later fragments with conflicting lengths beyond the heap buffer. The DTLS handshake is reachable without authentication; a small crafted packet sequence deterministically crashes the process, while impact beyond controlled memory corruption is not established.
Summary
What happened
Heap buffer overflow in GnuTLS DTLS reassembly allows remote attackers to crash applications via crafted handshake fragments. The merge_handshake_packet() path groups fragments only by handshake type, allocates from an initial smaller message_length, then copies later fragments with conflicting lengths beyond the heap buffer. The DTLS handshake is reachable without authentication; a small crafted packet sequence deterministically crashes the process, while impact beyond controlled memory corruption is not established.
The record
- CVE
- CVE-2026-33846
- Published
- May 4, 2026
- Updated
- Aug 31, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat OpenShift Container Platform 4.16
- Classifications
- CWE-130, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 4, 2026CVE publishedPublication date reported by the CVE source.
- Aug 31, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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