CVE-2026-88840 json
Busybox: busybox: tls ssl_server reads one byte out of bounds when parsing truncated clienthello
published 2026-09-23 46 d ago modified 2026-09-26 43 d ago also EUVD-2026-85513
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 10%
- public exploits
- 0
- none known
Summary
BusyBox TLS get_client_hello() reads past the end of the input buffer when parsing a truncated ClientHello message.
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-88840 updated cvss 5.3
busybox: busybox: TLS ssl_server reads one byte out of bounds when parsing truncated ClientHello
-
Red Hat Hardened Images busyboxnot affected: component not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 43 d ago
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected products
- Red Hat Red Hat Hardened Images
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
access.redhat.com
/security/cve/CVE-2026-88840
vdb-entry
-
bugzilla.redhat.com
/show_bug.cgi?id=2531354
issue-tracking
Sources
- CVE List CVE-2026-88840
- NVD CVE-2026-88840
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.