VulnSocial

CVE-2026-66731Disclosure

LOWCVSS 8.7 · HIGH

Signal is active with 2 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

facil.io 0.7.5 through 0.7.6 contains a denial-of-service vulnerability in the HTTP/1.1 chunked transfer encoding parser that allows unauthenticated remote attackers to crash the server by sending a negative chunk size value. Attackers can send a single POST request with a Transfer-Encoding: chunked header containing a leading minus sign in the chunk size field, causing the parser in http1_parser.h to compute a large positive integer from the negated value, corrupting internal state and moving the read pointer into unmapped memory resulting in a fault.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-125

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

  • 2 mentions across 1 observed day

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • General: 1 classified signal
  • 2 total mentions across 1 day

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-07-27: 2Technical Details · 2026-07-27: 207-27
Signal classification2 categories
Disclosure
150.0%
General
150.0%
Referenced assets3 URLs
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-66731 http://facil.io 0.7.5 through 0.7.6 contains a denial-of-service vulnerability in the HTTP/1.1 chunked transfer encoding parser that allows unauthenticated remote attackers … https://www.cve.org/CVERecord?id=CVE-2026-66731 ----- Traducción: CVE… http://infoflow.cloud`

    Post summary

    The text announces CVE‑2026‑66731, a denial‑of‑service flaw in facil.io that exploits the HTTP/1.1 chunked transfer encoding parser, with no PoC, exploit, or patch information provided.

    0000020
    95 followersView on X
  • CVE@CVEnew
    General

    CVE-2026-66731 http://facil.io 0.7.5 through 0.7.6 contains a denial-of-service vulnerability in the HTTP/1.1 chunked transfer encoding parser that allows unauthenticated remote attackers … https://www.cve.org/CVERecord?id=CVE-2026-66731

    Post summary

    The notice reports a DoS vulnerability in facil.io 0.7.5‑0.7.6’s HTTP/1.1 chunked transfer parser, with no PoC, exploit, patch, or active exploitation details.

    000001.1K
    57.9K followersView on X

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