VulnSocial

CVE-2026-42273Disclosure

LOWCVSS 7.8 · HIGH

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host that differs only in letter casing, potentially causing the request to be classified differently than intended. This issue has been patched in version 0.17.14.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-178CWE-436

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • 2 total mentions across 1 day

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-05-09: 2Patch / Workaround · 2026-05-09: 1Technical Details · 2026-05-09: 205-09
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-42273 Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive man… https://www.cve.org/CVERecord?id=CVE-2026-42273 ----- Traducción: CVE-2026-42273 Hei… http://infoflow.cloud`

    Post summary

    The post announces CVE‑2026‑42273 affecting Heimdall’s case‑sensitive host matching and includes a link to the CVE record, without any PoC, exploit, or mitigation details.

    0000028
    76 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-42273 Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive man… https://www.cve.org/CVERecord?id=CVE-2026-42273

    Post summary

    CVE‑2026‑42273 exposes a case‑sensitive host‑matching flaw in Heimdall affecting versions prior to 0.17.14, mitigated by upgrading to that patch level.

    00000176
    57.5K followersView on X

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