CVE catalog

CVE-2026-19204

A client may send a WebSocket frame with an unknown opcode and a very large declared payload length, causing Jetty to attempt a large memory allocation and potentially exhaust the JVM heap. This o

[CVE catalog]

Severity: High · CVSS 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Sep 7, 2026, 10:19:24 AM UTC
Updated: Sep 7, 2026, 11:17:20 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.45% · Oct 25, 2026

A client may send a WebSocket frame with an unknown opcode and a very large declared payload length, causing Jetty to attempt a large memory allocation and potentially exhaust the JVM heap. This occurs when auto-fragmentation is enabled, as unknown opcodes bypass the normal maximum frame size handling and payload allocation occurs before the opcode is validated.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	jetty9	sid	`9.4.58-2`	not affected
Debian	jetty9	forky	`9.4.58-2`	not affected
Debian	jetty9	trixie	`9.4.57-1.1~deb13u1`	not affected
Debian	jetty9	trixie-security	`9.4.57-1.1~deb13u1`	not affected
Debian	jetty9	bookworm	`9.4.57-1.1~deb12u1`	not affected
Debian	jetty9	bookworm-security	`9.4.57-1.1~deb12u1`	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	jetty9	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	jetty9	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	jetty9	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	jetty9	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 13 (Trixie)]

[jetty12]Affected
Details (4)
- 12.0.17-3.1~deb13u1 · all · trixie
  Affected
  nvd · jetty12 · debian · 13
- 12.0.17-3.1~deb13u1 · all · trixie
  Affected
  nvd · jetty12 · debian · 13
- 12.0.17-3.1~deb13u1 · all · trixie-security
  Affected
  nvd · jetty12 · debian · 13
- 12.0.17-3.1~deb13u1 · all · trixie-security
  Affected
  nvd · jetty12 · debian · 13
[libjetty12-extra-java]Affected
Source package: [jetty12]
Details (4)
- 12.0.17-3.1~deb13u1 · all · trixie
  Affected
  nvd · jetty12 · debian · 13
- 12.0.17-3.1~deb13u1 · all · trixie
  Affected
  nvd · jetty12 · debian · 13
- 12.0.17-3.1~deb13u1 · all · trixie-security
  Affected
  nvd · jetty12 · debian · 13
- 12.0.17-3.1~deb13u1 · all · trixie-security
  Affected
  nvd · jetty12 · debian · 13
[libjetty12-java]Affected
Source package: [jetty12]
Details (4)
- 12.0.17-3.1~deb13u1 · all · trixie
  Affected
  nvd · jetty12 · debian · 13
- 12.0.17-3.1~deb13u1 · all · trixie
  Affected
  nvd · jetty12 · debian · 13
- 12.0.17-3.1~deb13u1 · all · trixie-security
  Affected
  nvd · jetty12 · debian · 13
- 12.0.17-3.1~deb13u1 · all · trixie-security
  Affected
  nvd · jetty12 · debian · 13

[Debian 12 (Bookworm)]

[jetty9]Not affected
Details (4)
- 9.4.57-1.1~deb12u1 · all · bookworm
  Not affected
  nvd · jetty9 · debian · bookworm
- 9.4.57-1.1~deb12u1 · all · bookworm
  Not affected
  nvd · jetty9 · debian · bookworm
- 9.4.57-1.1~deb12u1 · all · bookworm-security
  Not affected
  nvd · jetty9 · debian · bookworm
- 9.4.57-1.1~deb12u1 · all · bookworm-security
  Not affected
  nvd · jetty9 · debian · bookworm
[libjetty9-extra-java]Not affected
Source package: [jetty9]
Details (4)
- 9.4.57-1.1~deb12u1 · all · bookworm
  Not affected
  nvd · jetty9 · debian · bookworm
- 9.4.57-1.1~deb12u1 · all · bookworm
  Not affected
  nvd · jetty9 · debian · bookworm
- 9.4.57-1.1~deb12u1 · all · bookworm-security
  Not affected
  nvd · jetty9 · debian · bookworm
- 9.4.57-1.1~deb12u1 · all · bookworm-security
  Not affected
  nvd · jetty9 · debian · bookworm
[libjetty9-java]Not affected
Source package: [jetty9]
Details (4)
- 9.4.57-1.1~deb12u1 · all · bookworm
  Not affected
  nvd · jetty9 · debian · bookworm
- 9.4.57-1.1~deb12u1 · all · bookworm
  Not affected
  nvd · jetty9 · debian · bookworm
- 9.4.57-1.1~deb12u1 · all · bookworm-security
  Not affected
  nvd · jetty9 · debian · bookworm
- 9.4.57-1.1~deb12u1 · all · bookworm-security
  Not affected
  nvd · jetty9 · debian · bookworm

Observed: Oct 27, 2026, 6:50:15 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]