CVE-2026-6679
Last modified
CVE-2026-6679 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A heap buffer overflow could occur in the DTLS 1.3 ACK serialization path before the connecting peer is authenticated. The buffer overflow was due to an integer truncation when computing the length of the ACK record-number list, causing an undersized buffer to be allocated and then overrun. EPSS estimates a 0.39% chance of exploitation in the next 30 days.
Description
A heap buffer overflow could occur in the DTLS 1.3 ACK serialization path before the connecting peer is authenticated. The buffer overflow was due to an integer truncation when computing the length of the ACK record-number list, causing an undersized buffer to be allocated and then overrun. This affects builds using DTLS 1.3 and wolfSSL version 5.9.0 and earlier. A fix was added to the 5.9.1 release.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Wolfssl | Wolfssl | >= 5.4.0, < 5.9.1 |
References
- https://github.com/wolfSSL/wolfssl/pull/10116Issue Tracking, Patch
- https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-6679?
How severe is CVE-2026-6679?
How do I fix CVE-2026-6679?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-66775SAP Approuter does not enforce cross-site request forgery pr…4.3
- CVE-2026-66776SAP Approuter does not consistently enforce integrity verifi…5.9
- CVE-2026-66777SAP Approuter does not sufficiently validate certain incomin…5.9
- CVE-2026-66778SAP Approuter does not sufficiently sanitize certain request…5.3
- CVE-2026-66779Due to a Cross-Site Scripting (XSS) vulnerability in SAP Net…6.3
- CVE-2026-6678Integer underflow in wc_PKCS7_DecryptOri when handling craft…5.3
- CVE-2026-66799Heap-based buffer overflow in Windows Key Guard allows an au…7.8
- CVE-2026-66802Concurrent execution using shared resource with improper syn…8.1
- CVE-2026-66803Improper access control in Azure Cosmos DB allows an unautho…10
- CVE-2026-66804Improper access control in Windows Cross Device Service allo…7.8
- CVE-2026-66805Deserialization of untrusted data in Microsoft Office ShareP…8.8
- CVE-2026-66806Off-by-one error in Microsoft Office Word allows an unauthor…5.5
Are you affected by CVE-2026-6679?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST