CVE-2026-5264

CRITICALNVD 9.89.8—

9.8

Heap buffer overflow in DTLS 1.3 ACK message processing. A remote attacker can send a crafted DTLS 1.3 ACK message that triggers a heap buffer overflow.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 33.5%
KEV: Not listed

Published

April 9, 2026

Last Modified

April 29, 2026

Advisory Details (1)

Auto-updated May 10, 2026

No patch confirmed yet.

generic

Dtls13: ack management improvements by rizlik · Pull Request #10076 · wolfSSL/wolfssl · GitHub

https://github.com/wolfssl/wolfssl/pull/10076

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-122Heap-based Buffer Overflow

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 11:22 UTCepss_batch
2026-05-20 09:38 UTCEG score recompute
2026-05-20 09:38 UTCGHSA enrichment
2026-05-20 05:29 UTCEG score recompute
2026-05-20 05:29 UTCGHSA enrichment
2026-05-20 01:32 UTCEG score recompute
2026-05-20 01:32 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-5264?

CVE-2026-5264 is a critical vulnerability published on April 9, 2026. Heap buffer overflow in DTLS 1.3 ACK message processing. A remote attacker can send a crafted DTLS 1.3 ACK message that triggers a heap buffer overflow.

When was CVE-2026-5264 disclosed?

CVE-2026-5264 was first published in the National Vulnerability Database on April 9, 2026, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-5264 actively exploited?

CVE-2026-5264 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-5264?

CVE-2026-5264 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2026-5264?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5264, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-5264

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

Dtls13: ack management improvements by rizlik · Pull Request #10076 · wolfSSL/wolfssl · GitHub

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-5264?

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Advisory Details (1)

Frequently asked(5)

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