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CVE-2026-26081 medium CVSS 4.8

Vulnerability in HAProxy Community Edition (CVE-2026-26081)

Summary

Vulnerability in HAProxy Community Edition (CVE-2026-26081). Risk of unauthorized operations or information disclosure.

Original description

The description as published by the source.

HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN format. HAProxy Enterprise and ALOHA are also affected.

Source: NIST National Vulnerability Database NVD GitHub Advisory

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-2026-26081 has been found in HAProxy Community Edition.
Risk of unauthorized operations or information disclosure. CVSS score: 4.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "HAProxy Community Edition CVE-2026-26081" on the vendor's site.

CVE-2026-26081 (HAProxy Community Edition) — CWE-130 / CVSS v3 4.8
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-130) exists in HAProxy Community Edition.

📍 Affected scope

Check the vendor advisory for the affected versions of HAProxy Community Edition.

🔥 Severity

Severity: Medium (CVSS 4.8/10). 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. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで HAProxy Community Edition を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-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。

Affected packages

Bitnami haproxy
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.0.16"},{"introduced":"3.1.0"},{"fixed":"3.1.14"},{"introduced":"3.2.0"},{"fixed":"3.2.12"},{"introduced":"3.3.0"},{"fixed":"3.3.3"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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