6.5

CVE-2026-59920: netty CRLF Injection

CVSS: 6.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-59920DEBIAN-CVE-2026-59920CGA-446j-xh26-4hgc
Published 29-07-2026Last modified 29-07-2026
Open JSON

Vulnerability summary

CVE-2026-59920 is a medium (CVSS 6.5) CRLF Injection vulnerability in netty. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.3% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · +0.18 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:11394-1SUSE-SU-2026:3482-1CGA-FHR3-WV99-VHCP

Timeline

  1. 29-07-2026
    PublishedVulnerability first disclosed.
  2. 29-07-2026
    Last modifiedVulnerability information updated.

Description

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's STOMP encoder ( StompSubframeEncoder ) does not escape or validate header values in  CONNECT  and  CONNECTED  frames, so raw newline ( \n ) characters in a header value are written directly to the wire, allowing an attacker who controls a header value to inject additional STOMP headers. This happens because the encoder intentionally skips escaping for CONNECT/CONNECTED frames per the STOMP 1.2 specification but never rejects the raw newlines, and since a broker parses each line as a separate header, an attacker controlling a value such as a user-supplied login or passcode can overwrite connection parameters or add authentication/role headers to bypass authentication or escalate privileges (the actual impact is broker-dependent). The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

+0.18 pp

From 0.24% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.41%

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

Chainguard7 products
  • gremlin-server< 3.8.1-r2
  • hadoop-fips-3.3.6All versions (No fix recorded)
  • hadoop-fips-3.4.2All versions (No fix recorded)
  • hadoop-fips-3.5All versions (No fix recorded) | < 3.5.0-r3
  • management-api-for-apache-cassandra-5.0< 0.1.122-r2
Debian1 product
  • nettyAll versions (No fix recorded)
Io.netty1 product
  • netty-codec-stomp≥ 4.2.0.Final, < 4.2.16.Final | < 4.1.136.Final
Netty1 product
  • netty< 4.1.136.Final | ≥ 4.2.0.Final, < 4.2.16.Final | < 4.1.136 | ≥ 4.2.0, < 4.2.16
Ubuntu1 product
  • nettyAll versions (No fix recorded)
Wolfi1 product
  • management-api-for-apache-cassandra-5.0< 0.1.122-r2

6 vendors · 12 products

References

9 links