CVE-2026-42578VulnerabilityPublished 10 Jun 2026Updated 22 Oct 2026

Red Hat Security Advisory: Red Hat build of Quarkus 3.27.4 release and security update

Affects Red Hat nettySource GCVE Database

Mentioned vulnerabilities

Not known to be exploited · fixed in Ubuntu package updates : patch the Ubuntu netty package soon.

Data as of 26 Oct 2026, 17:16 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 1.0% chance of exploitation in 30 days – higher than 64% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1:4.1.7-4ubuntu0.1+esm6, 1:4.1.45-1ubuntu0.1~esm6, 1:4.1.48-4+deb11u2ubuntu0.1+esm3 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
Ubuntu 26.10netty`pkg:deb/ubuntu/netty?arch=source&distro=stonking`Other threats	Affected =1:4.1.48-16 =1:4.1.48-16ubuntu1	Fixed in–
Ubuntu Pro 26.04 LTSnetty`pkg:deb/ubuntu/netty?arch=source&distro=esm-apps/resolute`Other threats	Affected <1:4.1.48-16ubuntu0.1~esm2	Fixed in 1:4.1.48-16ubuntu0.1~esm2
Ubuntu 25.10netty`pkg:deb/ubuntu/netty?arch=source&distro=questing`Other threats	Affected =1:4.1.48-10 =1:4.1.48-10ubuntu0.25.10.1 =1:4.1.48-10ubuntu0.25.10.2	Fixed in–
Ubuntu Pro 24.04 LTSnetty`pkg:deb/ubuntu/netty?arch=source&distro=esm-apps/noble`Other threats	Affected <1:4.1.48-9ubuntu0.1+esm3 =1:4.1.48-9ubuntu0.1~esm1 =1:4.1.48-9ubuntu0.1~esm2	Fixed in 1:4.1.48-9ubuntu0.1+esm3
Ubuntu Pro 22.04 LTSnetty`pkg:deb/ubuntu/netty?arch=source&distro=esm-apps/jammy`Other threats	Affected <1:4.1.48-4+deb11u2ubuntu0.1+esm3 =1:4.1.48-4+deb11u2ubuntu0.1~esm1 =1:4.1.48-4+deb11u2ubuntu0.1~esm2	Fixed in 1:4.1.48-4+deb11u2ubuntu0.1+esm3
Ubuntu Pro 20.04 LTSnetty`pkg:deb/ubuntu/netty?arch=source&distro=esm-apps/focal`Other threats	Affected <1:4.1.45-1ubuntu0.1~esm6	Fixed in 1:4.1.45-1ubuntu0.1~esm6

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

This release of Red Hat build of Quarkus 3.27.4 includes the following CVE fixes: * netty-codec-dns: Netty: High integrity impact due to improper DNS domain name constraint enforcement [quarkus-3.27] (CVE-2026-42579) * netty-codec-http: Netty: Incorrect HTTP response parsing leads to data confusion [quarkus-3.27] (CVE-2026-42584) * netty-codec-http: Netty: HTTP Request Smuggling due to improper handling of conflicting HTTP/1.0 headers [quarkus-3.27] (CVE-2026-42581) * netty-handler-proxy: Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation [quarkus-3.27] (CVE-2026-42578) * netty-codec-http: Netty: Denial of Service via unbounded memory allocation in HTTP content decompression [quarkus-3.27] (CVE-2026-42587) * netty-codec-http2: Netty: Denial of Service via unbounded memory allocation in HTTP content decompression [quarkus-3.27] (CVE-2026-42587) For more information, see the release notes page listed in the References section.

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection') (opens in a new tab)
Base weaknessOWASP Top 10 A05:2025: Injection (opens in a new tab)
The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
Implementation
Avoid using CRLF as a special sequence.
Implementation
Appropriately filter or quote CRLF sequences in user-controlled input.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
Injection Prevention (opens in a new tab)
SQL Injection Prevention (opens in a new tab)
Injection Prevention in Java (opens in a new tab)
OWASP ASVS 4.0.3
V1.5.1 (opens in a new tab)
Attack patterns
Command Delimiters (opens in a new tab)
Web Server Logs Tampering (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-1286Improper Validation of Syntactic Correctness of Input (opens in a new tab)
Base weakness
The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
SQL Injection (opens in a new tab)
NoSQL Injection (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') (opens in a new tab)
Base weaknessOWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
Implementation
Use a web server that employs a strict HTTP parsing procedure, such as Apache.
Implementation
Use only SSL communication.
Implementation
Terminate the client session after each request.
OWASP Cheat Sheets
REST Assessment (opens in a new tab)
REST Security (opens in a new tab)
Cross-Site Request Forgery Prevention (opens in a new tab)
Secure Design Principles (opens in a new tab)
OWASP ASVS 4.0.3
V13.2.5 (opens in a new tab)
Attack patterns
HTTP Response Smuggling (opens in a new tab)
HTTP Request Smuggling (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-770Allocation of Resources Without Limits or Throttling (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #25
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Requirements
Clearly specify the minimum and maximum expectations for capabilities, and dictate which behaviors are acceptable when resource allocation reaches limits.
Architecture and Design
Limit the amount of resources that are accessible to unprivileged users. Set per-user limits for resources. Allow the system administrator to define these limits. Be careful to avoid CWE-410.
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
OWASP ASVS 4.0.3
V8.1.4 (opens in a new tab)
V13.4.1 (opens in a new tab)
V11.1.4 (opens in a new tab)
Attack patterns
XML Ping of the Death (opens in a new tab)
Exponential Data Expansion (opens in a new tab)
Serialized Data Parameter Blowup (opens in a new tab)
Serialized Data with Nested Payloads (opens in a new tab)
Oversized Serialized Data Payloads (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

WeaknessesCWE-93, CWE-1286, CWE-444 +1

Technical details

References

Community reviews

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