PT-2026-26322 · Wolfssl · Wolfssl

Haruto Kimura · CVE-2026-2646 · Published 2026-03-19 · Updated 2026-07-14

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions wolfSSL (affected versions not specified)

Description A heap-buffer-overflow issue exists in the wolfSSL d2i SSL SESSION() function. When deserializing session data with SESSION CERTS enabled, the lengths of certificate and session ID are read from untrusted input without validation, potentially leading to a heap memory overflow. A crafted session loaded from an external source is required to trigger this issue. Internal sessions are not affected.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Heap Based Buffer Overflow

Weakness Enumeration

CWE-787

CWE-122

Related Identifiers

CVE-2026-2646

JLSEC-2026-702

Affected Products

Wolfssl

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2646.json · Exploit
• https://github.com/wolfSSL/wolfssl/pull/9748 · Patch
• https://github.com/wolfSSL/wolfssl/pull/9949 · Patch
• https://osv.dev/vulnerability/CVE-2026-2646 · Vendor Advisory
• https://osv.dev/vulnerability/JLSEC-2026-702 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-2646 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-2646 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2646 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-2646 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-2646 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2646 · Vendor Advisory
• https://github.com/wolfSSL/wolfssl · Note
• https://twitter.com/cyberbivash/status/2034703145822032311 · Twitter Post
• https://twitter.com/CVEnew/status/2036024190772650213 · Twitter Post
• https://twitter.com/yo_yo_yo_jbo/status/2035108074231574654 · Twitter Post