VulnSocial

CVE-2026-5680Disclosure

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-770

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-08-28: 1Technical Details · 2026-08-28: 108-28
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • Avishek Sarkar@lazysarkar7
    Disclosure

    I found a remote, unauthenticated DoS in Undertow: crafted WebSocket messages using permessage-deflate trigger exponential buffer growth and memory exhaustion. Red Hat has now published it as CVE-2026-5680. CVSS 7.5 (High) 👇 https://access.redhat.com/security/cve/CVE-2026-5680 #CyberSecurity #CVE #VulnerabilityResearch #java

    Post summary

    A new remote denial‑of‑service vulnerability, CVE‑2026‑5680, has been disclosed for Undertow, exploiting WebSocket permessage‑deflate to cause memory exhaustion, with no evidence of active exploitation or PoC.

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    25 followersView on X

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