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VulnerabilityPublished

CVE-2026-102984: withastro astro · Uncaught Exception

Affects withastro astroSource CVE Database V5

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Not known to be exploited · CVSS 8.2 High : upgrade to 11.1.3 soon.

Data as of 14 Nov 2026, 20:43 UTC

CVSS 4.0 base score
8.2High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 11.1.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 14 Nov 2026.

What to do

Upgrade astro and withastro/astro to 11.1.3.

Affected software

ProductAffectedFixed in
withastroastroAffected
  • <11.1.3
Fixed in
  • 11.1.3
GitHubwithastro/astropkg:github/withastro/astroOther threatsAffected
  • <11.1.3
Fixed in
  • 11.1.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to Astro version 11.1.3 or later, where this issue is fixed. If upgrading immediately is not possible, ensure that proxies or CDNs in front of the Astro server reject malformed Host headers to prevent the malformed requests from reaching the origin server. No other specific mitigations are indicated.

Description

CVE-2026-102984 is a high-severity vulnerability in the Astro web framework prior to version 11.1.3. The @astrojs/node adapter improperly builds request URLs from the Host header, and a malformed port can cause an invalid URL. This leads to an uncaught TypeError exception before routing begins. In the default configuration, this results in an HTTP 500 response while the server continues running. However, if staticHeaders is enabled, the uncaught exception causes the Node.js process to terminate, impacting availability. The vulnerability does not expose data or allow code execution. The issue is fixed in version 11.1.3.

References

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