CVE-2026-66752 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-66752MEDIUM

tiny-http 0.12.0 HTTP Request Smuggling via Transfer-Encoding Handling

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   N   N   L   L    6.3   .0024   15.0     —

AFFECTED
  Product    Versions     Fixed
  tiny-http  unspecified  —

TIMELINE
  Jul 27  Reserved by VulnCheck
  Jul 28  Published (CNA: VulnCheck)
  Aug 13  EXPLOIT PUBLISHED — CVE-2026-66752 (tiny-http). Public exploit reference added.

CWE-444 · CNA: VulnCheck · CVSS v4.0 · 2 references · NVD status: Deferred

Description

tiny-http through 0.12.0 contains an HTTP request smuggling vulnerability that allows remote attackers to desynchronize request framing by sending a Transfer-Encoding header with any value, including non-chunked codings, which causes the library to unconditionally apply chunk-decoding and discard Content-Length. Attackers can exploit the discrepancy between tiny_http's improper Transfer-Encoding parsing and a correctly-implemented front-end proxy to produce two distinct interpretations of a single byte stream, enabling request smuggling, and can additionally send non-chunked bodies with non-chunked Transfer-Encoding values to cause failed body reads that tie up connections and consume worker threads without signaling errors to clients.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 27, 2026	Reserved	Reserved by VulnCheck
July 28, 2026	Published	Published (CNA: VulnCheck)
August 13, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-66752 (tiny-http). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
tiny-http	tiny-http	—	—	—

Weaknesses

CWE-444

References (2)

https://github.com/theopaid/HTTP-Request-Smuggling-via-Unparsed-Transfer-Encoding-Values-tiny_http-/tree/master [technical-description, exploit]
https://www.vulncheck.com/advisories/tiny-http-http-request-smuggling-via-transfer-encoding-handling [third-party-advisory]

Authoritative record: CVE-2026-66752 at cve.org

Vendors: tiny-http

Weaknesses: CWE-444

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66752 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.