CVE-2026-88840
Busybox: busybox: tls ssl_server reads one byte out of bounds when parsing truncated clienthello
Description
BusyBox TLS get_client_hello() reads past the end of the input buffer when parsing a truncated ClientHello message.
INFO
Published Date :
Sept. 23, 2026, 6:17 p.m.
Last Modified :
Sept. 23, 2026, 6:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update BusyBox to a patched version.
- Recompile BusyBox with updated source code.
- Apply relevant security patches.
- Review TLS handling code.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-88840.
| URL | Resource |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-88840 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2531354 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-88840 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-88840
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-88840 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-88840 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Sep. 23, 2026
Action Type Old Value New Value Added Description BusyBox TLS get_client_hello() reads past the end of the input buffer when parsing a truncated ClientHello message. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added CWE CWE-125 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88840.json">CVE-2026-88840</a> Added Reference https://access.redhat.com/security/cve/CVE-2026-88840 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2531354