What is CVE-2026-5264?
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.
The record classifies CVE-2026-5264 under weakness class CWE-122. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 184 days ago.
Severity and exploitation probability
- CVSS v4.0 base score
- 8.3 — High (derived from score)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N - EPSS (FIRST)
- 0.5% probability of exploitation in the next 30 days, higher than 46.7% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-04-09, last modified 2026-04-10
Is CVE-2026-5264 being exploited?
Weaponised exploit code for CVE-2026-5264 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 25 in the Threadlinqs vulnerability feed.
- trickest/cve (trickest)
Affected products and versions
- wolfSSL: wolfSSL
How to fix CVE-2026-5264
No vendor patch reference has been recorded for CVE-2026-5264 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-5264
1 tracked threat in the Threadlinqs corpus references CVE-2026-5264, either in the campaign’s CVE list or as an indicator on the campaign record.
- Multiple WolfSSL Critical Vulnerabilities: Certificate Bypass, RCE, and Post-Quantum Weakening — CRITICAL · 2026-06-30
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .