CVE-2018-19530: HTTL (aka Hyper-Text Template Language) through 1.0.11 allows remote command execution because the decodeXml f

Q: How do I fix CVE-2018-19530?

httl: upgrade to newer than 1.0.11. Exact commands for each OS are on this page.

Q: Is CVE-2018-19530 being exploited?

CVE-2018-19530 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-19530 affect?

CVE-2018-19530 affects httl. Severity is critical (CVSS 9.8). HTTL (aka Hyper-Text Template Language) through 1.0.11 allows remote command execution because the decodeXml function uses XStream unsafely when configured with an xml.codec=httl.spi.codecs.XstreamCodec setting.

Q: How urgent is CVE-2018-19530?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2018-19530 is a critical-severity flaw (CVSS 9.8) affecting httl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HTTL (aka Hyper-Text Template Language) through 1.0.11 allows remote command execution because the decodeXml function uses XStream unsafely when configured with an xml.codec=httl.spi.codecs.XstreamCodec setting.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.6% (top 8%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-11-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: httl project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-11-26 02:29 UTCPublished CVE record published
2026-06-17 01:49 UTCUpdated Record last modified

httl project httl UPGRADE

Affected: <= 1.0.11

Fixed in: newer than 1.0.11

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy httl || rpm -q httl || httl --version

2. UPGRADE to newer than 1.0.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade httl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade httl

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-19530?

httl: upgrade to newer than 1.0.11. Exact commands for each OS are on this page.

Is CVE-2018-19530 being exploited?

CVE-2018-19530 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-19530 affect?

CVE-2018-19530 affects httl. Severity is critical (CVSS 9.8). HTTL (aka Hyper-Text Template Language) through 1.0.11 allows remote command execution because the decodeXml function uses XStream unsafely when configured with an xml.codec=httl.spi.codecs.XstreamCodec setting.

How urgent is CVE-2018-19530?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-19531 CRITICAL 9.8 UPGRADE HTTL (aka Hyper-Text Template Language) through 1.0.11 allows remote command execution because the decodeXml f

References

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