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CVE-2026-19203

Quick assessment

Affected
Eclipse Foundation Eclipse Jetty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

客户端可能向 Jetty 服务器发送经过特殊构造的 HTTP/1.1 块状编码（chunked）请求，导致 Jetty 与中间代理服务器对请求边界的解释产生差异，从而可能引发 HTTP 请求走私（HTTP Request Smuggling）。 该问题源于 Jetty 在解析块状请求的某些部分时，将单个 LF 字符（\n）视为终止符。根据 Jetty 的版本及配置的 HTTP 合规模式，这种情况可能出现在块扩展字段、块数据终止或尾部（trailer）终止环节。

CVSS 8.3 · High

Affected Version Matrix 5

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse Jetty 12.1.0≤ 12.1.11 affected
12.0.0≤ 12.0.37 affected
11.0.0≤ 11.0.31 affected
10.0.0≤ 10.0.31 affected
9.4.0≤ 9.4.63 affected
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I. Basic Information for CVE-2026-19203

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty server that cause Jetty and an intermediary proxy to interpret different request boundaries, potentially resulting in HTTP request smuggling. This is caused by Jetty accepting a lone LF character as a terminator in parts of chunked request parsing. Depending on the Jetty version and configured HTTP compliance mode, this may occur in chunk extensions, chunk data termination, or trailer termination.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse Jetty 12.1.0 ~ 12.1.11 -

II. Public POCs for CVE-2026-19203

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III. Intelligence Information for CVE-2026-19203

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Vendor Advisories for CVE-2026-19203 (1)

Same Patch Batch · Eclipse Foundation · 2026-09-08 · 5 CVEs total

CVE-2026-86464 9.9 CRITICAL CVE-2026-86464
CVE-2026-84197 9.2 CRITICAL Ditto Node.js客户端 1.0.0-3.9.0 WebSocket TLS验证缺失
CVE-2026-12611 8.7 HIGH Jetty HTTP/2竞态条件导致服务器无响应
CVE-2026-86590 6.3 MEDIUM Eclipse Che 7.79.0-7.121.0 服务端请求伪造（SSRF）

IV. Related Vulnerabilities

Same product: Eclipse Jetty
Same vendor: Eclipse Foundation
Same weakness: CWE-444

V. Comments for CVE-2026-19203

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