CVE catalog
CVE-2026-88840
BusyBox TLS get_client_hello() reads past the end of the input buffer when parsing a truncated ClientHello message.
- Severity
- Medium · CVSS 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.21% · Oct 25, 2026
BusyBox TLS get_client_hello() reads past the end of the input buffer when parsing a truncated ClientHello message.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | busybox | sid | 1:1.38.0-3 | vulnerable |
| Debian | busybox | forky | 1:1.38.0-3 | vulnerable |
| Debian | busybox | trixie | 1:1.37.0-6 | not affected |
| Debian | busybox | bookworm | 1:1.35.0-4+deb12u1 | not affected |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | busybox | source | sid | (unfixed) | not yet assigned | Not reported | [1151053] |
| Debian | busybox | source | forky | (unfixed) | not yet assigned | Not reported | [1151053] |
| Debian | busybox | source | trixie | Not affected | unimportant | Not reported | [1151053] |
| Debian | busybox | source | bookworm | Not affected | unimportant | Not reported | [1151053] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [busybox]Not affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormNot affected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1+b1· arm64 · bookwormNot affected
nvd · busybox · debian · bookworm
- [busybox-static]Not affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormNot affected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1+b1· arm64 · bookwormNot affected
nvd · busybox · debian · bookworm
- [busybox-syslogd]Not affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1· all · bookwormNot affected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1· all · bookwormNot affected
nvd · busybox · debian · bookworm
- [udhcpc]Not affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormNot affected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1+b1· arm64 · bookwormNot affected
nvd · busybox · debian · bookworm
- [udhcpd]Not affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormNot affected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1+b1· arm64 · bookwormNot affected
nvd · busybox · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-88840]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-88840]
- [https://security-tracker.debian.org/tracker/CVE-2026-88840]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88840.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3557.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]