GHSA-m59c-jpc8-m2x4 CVE-2018-1336

In Apache Tomcat there is an improper handing of overflow in the UTF-8 decoder

High Maven

Severity: 7.5 / 10; High · CVSS 3.1
Exploit chance (EPSS): 20.35%; Chance of exploitation in the next 30 days. Higher than 97.49% of scored vulnerabilities.
Known exploited: No; Not in CISA's catalog
Weakness: CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
Fix: 9.0.8; Upgrade org.apache.tomcat.embed:tomcat-embed-core to this version or later

Description

An improper handing of overflow in the UTF-8 decoder with supplementary characters can lead to an infinite loop in the decoder causing a Denial of Service. Versions Affected: Apache Tomcat 9.0.0.M9 to 9.0.7, 8.5.0 to 8.5.30, 8.0.0.RC1 to 8.0.51, and 7.0.28 to 7.0.86.

Affected versions

Maven

Package	Vulnerable	Fixed in
org.apache.tomcat.embed:tomcat-embed-core	`>= 9.0.0.M9, < 9.0.8`	`9.0.8`
org.apache.tomcat.embed:tomcat-embed-core	`>= 8.5.0, < 8.5.31`	`8.5.31`
org.apache.tomcat.embed:tomcat-embed-core	`>= 8.0.0RC1, < 8.0.51`	`8.0.51`
org.apache.tomcat.embed:tomcat-embed-core	`>= 7.0.28, < 7.0.87`	`7.0.87`

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

org.apache.tomcat.embed:tomcat-embed-core Maven → `9.0.8`

maven

<dependency><groupId>org.apache.tomcat.embed</groupId><artifactId>tomcat-embed-core</artifactId><version>9.0.8</version></dependency>

gradle

implementation("org.apache.tomcat.embed:tomcat-embed-core:9.0.8")

Severity breakdown

CVSS 3.1 7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Weakness

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

References

Advisories

nvd.nist.gov/vuln/detail/CVE-2018-1336

Packages

github.com/apache/tomcat

Timeline

Oct 17, 2018 Published
Mar 12, 2024 Last updated by the source
Oct 31, 2026 Latest EPSS score

Advisory	Severity	Why it's related
GHSA-83qj-6fr2-vhqg Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT	Critical Known exploited	Also affects org.apache.tomcat.embed:tomcat-embed-core
GHSA-qppj-fm5r-hxr3 HTTP/2 Stream Cancellation Attack	Medium Known exploited	Also affects org.apache.tomcat.embed:tomcat-embed-core
GHSA-xjgh-84hx-56c5 Unrestricted Upload of File with Dangerous Type Apache Tomcat	High Known exploited	Also affects org.apache.tomcat.embed:tomcat-embed-core
CVE-2020-1938 Improper Privilege Management in Tomcat	Critical Known exploited	Also affects org.apache.tomcat.embed:tomcat-embed-core
GHSA-pjfr-qf3p-3q25 When running Apache Tomcat on Windows with HTTP PUTs enabled it was possible to upload a JSP file to the server	High Known exploited	Also affects org.apache.tomcat.embed:tomcat-embed-core
GHSA-h3x4-894j-xpx5 Apache Tomcat's FORM authentication process has an Incorrect Authorization vulnerability	Critical	Also affects org.apache.tomcat.embed:tomcat-embed-core
GHSA-9xv2-5v5q-p794 Apache Tomcat's DIGEST authenticator has an Authentication Bypass by Capture-replay vulnerability	Critical	Also affects org.apache.tomcat.embed:tomcat-embed-core
GHSA-f525-44xv-f2qj Apache Tomcat - HTTP/2 no-authority bypass of strict SNI validation	Critical	Also affects org.apache.tomcat.embed:tomcat-embed-core

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