8.3

CVE-2026-19203: eclipse foundation eclipse jetty HTTP Request/Response Smuggling

CVSS: 8.3v4.0HighDeferred
AliasesUBUNTU-CVE-2026-19203DEBIAN-CVE-2026-19203CGA-9r6q-2cwx-hm8j
Published 08-09-2026Last modified 08-09-2026
Open JSON

Vulnerability summary

CVE-2026-19203 is a high (CVSS 8.3) HTTP Request/Response Smuggling vulnerability in eclipse foundation eclipse jetty. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 21.9% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.3/10
010
High · v4.0 (CVE.org)
EPSS score
0.31%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-09-2026
    PublishedVulnerability first disclosed.
  2. 08-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

+0.02 pp

From 0.29% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard28 products
  • cruise-control-fips-jars< 2.5.146-r9 | All versions (No fix recorded)
  • cruise-control-jars< 2.5.146-r9 | All versions (No fix recorded)
  • kafka-3.7All versions (No fix recorded)
  • kafka-3.8All versions (No fix recorded)
  • kafka-3.9All versions (No fix recorded)
Wolfi9 products
  • kafka-4.1< 4.1.2-r13
  • kafka-4.2< 4.2.2-r4
  • strimzi-kafka-operator-cluster-operator< 1.2.0-r11
  • strimzi-kafka-operator-kafka-agent< 1.2.0-r11
  • strimzi-kafka-operator-kafka-init< 1.2.0-r11
Ubuntu3 products
  • jettyAll versions (No fix recorded)
  • jetty12All versions (No fix recorded)
  • jetty9All versions (No fix recorded)
Debian2 products
  • jetty12All versions (No fix recorded)
  • jetty9All versions (No fix recorded)
Eclipse foundation1 product
  • eclipse jetty≥ 12.1.0, ≤ 12.1.11 | ≥ 12.0.0, ≤ 12.0.37 | ≥ 11.0.0, ≤ 11.0.31 | ≥ 10.0.0, ≤ 10.0.31 | ≥ 9.4.0, ≤ 9.4.63

5 vendors · 43 products

References

6 links