CVE-2026-29772: Astro is a web framework

Q: How do I fix CVE-2026-29772?

\@astrojs\/node: upgrade to 10.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-29772 being exploited?

CVE-2026-29772 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-2026-29772 affect?

CVE-2026-29772 affects \@astrojs\/node. Severity is medium (CVSS 5.9). Astro is a web framework. Prior to version 10.0.0, Astro's Server Islands POST handler buffers and parses the full request body as JSON without enforcing a size limit. Because JSON.parse() allocates a V8 heap object for every element in the

Q: How urgent is CVE-2026-29772?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.9REMOTEUPGRADE

CVE-2026-29772 is a medium-severity flaw (CVSS 5.9) affecting \@astrojs\/node. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Astro is a web framework. Prior to version 10.0.0, Astro's Server Islands POST handler buffers and parses the full request body as JSON without enforcing a size limit. Because JSON.parse() allocates a V8 heap object for every element in the input, a crafted payload of many small JSON objects achieves ~15x memory amplification (wire bytes to heap bytes), allowing a single unauthenticated request to exhaust the process heap and crash the server. Th

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-03-24
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2026-03-24 19:16 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

astro \@astrojs\/node UPGRADE

Affected: >= 9.0.0 and < 10.0.0

Fixed in: 10.0.0

Safe to downgrade to: a release before 9.0.0

1. Check installed version

npm ls astrojsnode

2. UPGRADE to 10.0.0

npm install astrojsnode@">=10.0.0"

3. If no update is available yet, DOWNGRADE to a release before 9.0.0

npm view astrojsnode versions npm install astrojsnode@"<9.0.0"

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-2026-29772?

\@astrojs\/node: upgrade to 10.0.0. Exact commands for each OS are on this page.

Is CVE-2026-29772 being exploited?

CVE-2026-29772 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-2026-29772 affect?

CVE-2026-29772 affects \@astrojs\/node. Severity is medium (CVSS 5.9). Astro is a web framework. Prior to version 10.0.0, Astro's Server Islands POST handler buffers and parses the full request body as JSON without enforcing a size limit. Because JSON.parse() allocates a V8 heap object for every element in the

How urgent is CVE-2026-29772?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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