CVE-2023-26044: react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2023-26044 is a medium-severity flaw (CVSS 5.3) affecting http. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP. Previous versions of ReactPHP's HTTP server component contain a potential DoS vulnerability that can cause high CPU load when processing large HTTP request bodies. This vulnerability has little to no impact on the default configuration, but can be exploited when explicitly using the RequestBodyBufferMiddleware with very large settings. This might lead to

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-400
Published	2023-05-17
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: reactphp

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

Am I affected?

Timeline

2023-05-17 18:15 UTCPublished CVE record published
2026-06-17 05:42 UTCUpdated Record last modified

reactphp http UPGRADE

Affected: >= 0.8.0 and < 1.9.0

Fixed in: 1.9.0

Safe to downgrade to: a release before 0.8.0

1. Check installed version

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

2. UPGRADE to 1.9.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade http

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 0.8.0 (Debian / Ubuntu)

apt-cache madison http sudo apt install http=<VERSION_BEFORE_0.8.0> sudo apt-mark hold http

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

dnf --showduplicates list http sudo dnf downgrade http-<VERSION_BEFORE_0.8.0> sudo dnf versionlock add http

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.

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-2023-26044?

http: upgrade to 1.9.0. Exact commands for each OS are on this page.

Is CVE-2023-26044 being exploited?

CVE-2023-26044 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-2023-26044 affect?

CVE-2023-26044 affects http. Severity is medium (CVSS 5.3). react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP. Previous versions of ReactPHP's HTTP server component contain a potential DoS vulnerability that can cause high CPU load when processing large HTT

How urgent is CVE-2023-26044?

Priority 37/100. Remotely exploitable, no login, no user action

Software pages

React vulnerabilities

Related CVEs

CVE-2022-36032 MEDIUM 5.3 UPGRADE ReactPHP HTTP is a streaming HTTP client and server implementation for ReactPHP

References

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