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CVE-2026-48840
medium
CVSS 5.3
Vulnerability in exim (CVE-2026-48840)
Summary
vulnerability in exim (CVE-2026-48840). Risk of unauthorized operations or information disclosure.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-48840** has been found in exim.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "exim CVE-2026-48840" on the vendor's site.
CVE-2026-48840 (exim) — CWE-839 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
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.
❓ What is the problem
**A vulnerability** (CWE-839) exists in exim.
📍 Affected scope
exim — .
🔥 Severity
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'exim' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'exim' . | 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 `exim` を grep し、稼働しているサービス・バージョンを把握する。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- web https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
- web https://www.openwall.com/lists/oss-security/2026/05/29/3
- web https://nvd.nist.gov/vuln/detail/CVE-2026-48840
- web https://github.com/advisories/GHSA-wgrp-2w9f-fmvg
- web http://www.openwall.com/lists/oss-security/2026/05/29/3
- web https://lists.debian.org/debian-lts-announce/2026/06/msg00004.html