Dashboard / CVE-2026-43820

CVE-2026-43820

HIGH
MEDIUM Priority: 0.01 BB Relevance: 50/100
Published: 2026-07-23 Modified: 2026-10-24 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Auth No Interaction Conf. Impact

CVSS Vector Breakdown

AV: Local
AC: Low
PR: None
UI: None
S: Unchanged
C: High
I: None
A: High

Description

NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs. NIOSSL provides access to a buffer assumed to be backed by an ASN1_STRING, but not all SANs are backed by ASN1_STRING, so accessing the buffer for such a type can lead to out-of-bounds memory access. This vulnerability is addressed in swift-nio-ssl version 2.37.2.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
apple swiftnio_ssl 2.18.0 – 2.37.2

References & Advisories (1)

Bug Bounty Relevance

50 / 100
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.7 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS — Exploitation Probability

0.11%
Raw Score 0.001090
Percentile 1.2%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00109
2026-10-28
0.00109

Intelligence Sources

nvd ref →

External Links