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Vulnerability details: VCID-xuyn-pjpb-g7du
Vulnerability ID VCID-xuyn-pjpb-g7du
Aliases CVE-2026-2646
Summary A heap-buffer-overflow vulnerability exists in wolfSSL's wolfSSL_d2i_SSL_SESSION() function. When deserializing session data with SESSION_CERTS enabled, certificate and session id lengths are read from an untrusted input without bounds validation, allowing an attacker to overflow fixed-size buffers and corrupt heap memory. A maliciously crafted session would need to be loaded from an external source to trigger this vulnerability. Internal sessions were not vulnerable.
Status Published
Exploitability 0.5
Weighted Severity 4.5
Risk 2.2
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-122 Heap-based Buffer Overflow
System Score Found at
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-2646
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-2646
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-2646
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-2646
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-2646
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-2646
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-2646
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-2646
cvssv4 5 https://github.com/wolfSSL/wolfssl/pull/9748
ssvc Track https://github.com/wolfSSL/wolfssl/pull/9748
cvssv4 5 https://github.com/wolfSSL/wolfssl/pull/9949
ssvc Track https://github.com/wolfSSL/wolfssl/pull/9949
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-2646
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2646
9748 https://github.com/wolfSSL/wolfssl/pull/9748
9949 https://github.com/wolfSSL/wolfssl/pull/9949
No exploits are available.
Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:P Found at https://github.com/wolfSSL/wolfssl/pull/9748
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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passive

active

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-19T17:43:50Z/ Found at https://github.com/wolfSSL/wolfssl/pull/9748
Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:P Found at https://github.com/wolfSSL/wolfssl/pull/9949
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-19T17:43:50Z/ Found at https://github.com/wolfSSL/wolfssl/pull/9949
Exploit Prediction Scoring System (EPSS)
Percentile 0.02167
EPSS Score 0.00013
Published At April 7, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T16:39:25.962293+00:00 Debian Oval Importer Import https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2 38.0.0