CVE-2026-5264 | BDVDB-2026-325972 Detail

wolfSSLwolfSSL

Description#

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.

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-122 Heap-based Buffer Overflow

References#

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

Exploit#

No public exploit known

History#

Version 12026-04-09Record published in the CVE List.
Version 22026-04-10Most recent update recorded in the CVE List.

Published

Published: 2026-04-09
Last modified: 2026-04-10

Vendor information

Vendor: wolfSSL
Product: wolfSSL

All wolfSSL vulnerabilities

Score

8.3 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 39.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 5.9.1
Fixed
5.9.1

Scoring System

CVSS v4.0

8.3 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	None
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).