CVE-2019-15605: HTTP request smuggling in Node.js 10, 12, and 13 causes malicious payload delivery when transfer-encoding is m

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CRITICAL 9.8REMOTEWATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2019-15605 is a critical-severity flaw (CVSS 9.8) affecting node.js, debian linux, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HTTP request smuggling in Node.js 10, 12, and 13 causes malicious payload delivery when transfer-encoding is malformed

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Remotely exploitable, no login, no user action
On your watchlist

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	57.1% (top 1%)
CISA exploited list	No
Weakness	CWE-444
Published	2020-02-07
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: debian · fedoraproject · nodejs · opensuse · redhat

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

Am I affected?

Timeline

2020-02-07 15:15 UTCPublished CVE record published
2026-06-17 02:20 UTCUpdated Record last modified

nodejs node.js UPGRADE

Affected: >= 10.0.0 and < 10.19.0 · >= 12.0.0 and < 12.15.0 · >= 13.0.0 and < 13.8.0

Fixed in: 10.19.0, 12.15.0, 13.8.0

Safe to downgrade to: a release before 10.0.0

1. Check installed version

apt-cache policy node.js || rpm -q node.js || node.js --version

2. UPGRADE to 10.19.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade node.js

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade node.js

Note

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

3. If no update is available yet, DOWNGRADE to a release before 10.0.0 (Debian / Ubuntu)

apt-cache madison node.js sudo apt install node.js=<VERSION_BEFORE_10.0.0> sudo apt-mark hold node.js

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list node.js sudo dnf downgrade node.js-<VERSION_BEFORE_10.0.0> sudo dnf versionlock add node.js

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

debian debian linux MITIGATE

Affected: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

fedoraproject fedora MITIGATE

Affected: 30

Fixed in: no fixed release known

Safe to downgrade to: a release before 30

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

opensuse leap MITIGATE

Affected: 15.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat software collections DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy software-collections || rpm -q software-collections || software-collections --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison software-collections sudo apt install software-collections=<VERSION_BEFORE_1.0> sudo apt-mark hold software-collections

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list software-collections sudo dnf downgrade software-collections-<VERSION_BEFORE_1.0> sudo dnf versionlock add software-collections

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat enterprise linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · libopenmpt · FIXED · 0.8.10-2.fc46 · FEDORA-2026-a9998621be · source

sudo dnf upgrade --advisory=FEDORA-2026-a9998621be

Debian 12 · http-parser · FIXED · 2.9.4-2

sudo apt update && sudo apt install --only-upgrade http-parser dpkg --compare-versions "$(dpkg-query -W -f='${Version}' http-parser)" ge "2.9.4-2" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · http-parser · FIXED · 2.9.4-2

sudo apt update && sudo apt install --only-upgrade http-parser dpkg --compare-versions "$(dpkg-query -W -f='${Version}' http-parser)" ge "2.9.4-2" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · nodejs · FIXED · 10.19.0~dfsg-1

sudo apt update && sudo apt install --only-upgrade nodejs dpkg --compare-versions "$(dpkg-query -W -f='${Version}' nodejs)" ge "10.19.0~dfsg-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · nodejs · FIXED · 10.19.0~dfsg-1

sudo apt update && sudo apt install --only-upgrade nodejs dpkg --compare-versions "$(dpkg-query -W -f='${Version}' nodejs)" ge "10.19.0~dfsg-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 7 · http-parser · FIXED · http-parser-2.7.1-8.el7_7.2

sudo dnf upgrade --advisory=RHSA-2020:0703 rpm -q http-parser

RHEL 7.6 Extended Update Support · http-parser · FIXED · http-parser-2.7.1-5.el7_6.1

sudo dnf upgrade --advisory=RHSA-2020:1510 rpm -q http-parser

RHEL 8 · http-parser · FIXED · http-parser-2.8.0-5.el8_1.2

sudo dnf upgrade --advisory=RHSA-2020:0708 rpm -q http-parser

RHEL 8.0 Update Services for SAP Solutions · http-parser · FIXED · http-parser-2.8.0-2.el8_0.2

sudo dnf upgrade --advisory=RHSA-2020:0707 rpm -q http-parser

Alpine 3.20 · nodejs · FIXED · nodejs-12.15.0-r0

apk add --upgrade nodejs apk info -v nodejs

Alpine 3.20 · nodejs-current · FIXED · nodejs-current-13.11.0-r0

apk add --upgrade nodejs-current apk info -v nodejs-current

Alpine 3.21 · nodejs · FIXED · nodejs-12.15.0-r0

apk add --upgrade nodejs apk info -v nodejs

Alpine 3.21 · nodejs-current · FIXED · nodejs-current-13.11.0-r0

apk add --upgrade nodejs-current apk info -v nodejs-current

Amazon Linux 2 · see advisory · FIXED · ALAS2-2020-1417 · source

sudo yum update --advisory=ALAS2-2020-1417

Amazon Linux 1 · see advisory · FIXED · ALAS-2020-1359 · source

sudo yum update --advisory=ALAS-2020-1359

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: 0-9194/node-poc-http-smuggling (0 stars)
Write-up: hackerone.com/reports/735748
Write-up: www.oracle.com//security-alerts/cpujul2021.html
Write-up: www.oracle.com/security-alerts/cpuapr2020.html
GitHub PoC: Live-Hack-CVE/CVE-2019-15605

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-2019-15605?

node.js: upgrade to 10.19.0, 12.15.0, 13.8.0; debian linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-15605 being exploited?

CVE-2019-15605 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-2019-15605 affect?

CVE-2019-15605 affects node.js, debian linux, fedora. Severity is critical (CVSS 9.8). HTTP request smuggling in Node.js 10, 12, and 13 causes malicious payload delivery when transfer-encoding is malformed

How urgent is CVE-2019-15605?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Node.js vulnerabilities · Debian vulnerabilities

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References

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