Vulnerability in Samba (CVE-2026-45232)
Summary
Vulnerability in Samba (CVE-2026-45232). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory by sending a malformed HTTP proxy response. Attackers can exploit this by positioning themselves between the client and proxy or controlling the proxy server to send a response line of 1023 or more bytes without a newline terminator, causing a null byte to be written to an out-of-bounds stack address when the RSYNC_PROXY environment variable is set.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-45232 has been found in Samba.
Risk of unauthorized operations or information disclosure. CVSS score: 3.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Samba CVE-2026-45232" on the vendor's site.
CVE-2026-45232 (Samba) — CWE-193 / CVSS v3 3.1
Attack vector: remote (network-reachable) / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-193) exists in Samba.
Check the vendor advisory for the affected versions of Samba.
Severity: Low (CVSS 3.1/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Samba' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Samba' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Sambaを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2026-45232 rsync Fixed in: 3.4.3-r0
- BellSoft Alpaquita BELL-CVE-2026-45232 rsync Fixed in: 3.4.3-r0
- Debian DEBIAN-CVE-2026-45232 rsync
- Ubuntu UBUNTU-CVE-2026-45232 rsync Fixed in: 3.1.0-2ubuntu0.4+esm3
References
- advisory disclosure@vulncheck.com
- patch disclosure@vulncheck.com
- web disclosure@vulncheck.com