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Vulnerability details: VCID-b172-yv6a-ykex
Vulnerability ID VCID-b172-yv6a-ykex
Aliases CVE-2026-25545
GHSA-qq67-mvv5-fw3g
Summary Astro is a web framework. Prior to version 9.5.4, Server-Side Rendered pages that return an error with a prerendered custom error page (eg. `404.astro` or `500.astro`) are vulnerable to SSRF. If the `Host:` header is changed to an attacker's server, it will be fetched on `/500.html` and they can redirect this to any internal URL to read the response body through the first request. An attacker who can access the application without `Host:` header validation (eg. through finding the origin IP behind a proxy, or just by default) can fetch their own server to redirect to any internal IP. With this they can fetch cloud metadata IPs and interact with services in the internal network or localhost. For this to be vulnerable, a common feature needs to be used, with direct access to the server (no proxies). Version 9.5.4 fixes the issue.
Status Published
Exploitability 0.5
Weighted Severity 7.7
Risk 3.9
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-918 Server-Side Request Forgery (SSRF)
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.05142 https://api.first.org/data/v1/epss?cve=CVE-2026-25545
epss 0.05142 https://api.first.org/data/v1/epss?cve=CVE-2026-25545
cvssv3.1 8.6 https://docs.astro.build/en/basics/astro-pages/#custom-500-error-page
cvssv4 6.9 https://docs.astro.build/en/basics/astro-pages/#custom-500-error-page
generic_textual MODERATE https://docs.astro.build/en/basics/astro-pages/#custom-500-error-page
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-qq67-mvv5-fw3g
cvssv3.1 8.6 https://github.com/withastro/astro
cvssv4 6.9 https://github.com/withastro/astro
generic_textual MODERATE https://github.com/withastro/astro
cvssv3.1 8.6 https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
cvssv4 6.9 https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
generic_textual MODERATE https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
ssvc Track https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
cvssv3.1 8.6 https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4
cvssv4 6.9 https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4
generic_textual MODERATE https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4
ssvc Track https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4
cvssv3.1 8.6 https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
cvssv3.1_qr MODERATE https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
cvssv4 6.9 https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
generic_textual MODERATE https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
ssvc Track https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
cvssv3.1 8.6 https://nvd.nist.gov/vuln/detail/CVE-2026-25545
cvssv4 6.9 https://nvd.nist.gov/vuln/detail/CVE-2026-25545
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-25545
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-25545
https://docs.astro.build/en/basics/astro-pages/#custom-500-error-page
https://github.com/withastro/astro
%40astrojs%2Fnode%409.5.4 https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4
CVE-2026-25545 https://nvd.nist.gov/vuln/detail/CVE-2026-25545
e01e98b063e90d274c42130ec2a60cc0966622c9 https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
GHSA-qq67-mvv5-fw3g https://github.com/advisories/GHSA-qq67-mvv5-fw3g
GHSA-qq67-mvv5-fw3g https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Found at https://docs.astro.build/en/basics/astro-pages/#custom-500-error-page
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

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high

none

required

unchanged

changed

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none

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none
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N Found at https://docs.astro.build/en/basics/astro-pages/#custom-500-error-page
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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present

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Found at https://github.com/withastro/astro
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

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required

unchanged

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Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N Found at https://github.com/withastro/astro
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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present

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Found at https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

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none

high

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none
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N Found at https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

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passive

active

high

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low

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-26T14:50:52Z/ Found at https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Found at https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N Found at https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

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passive

active

high

low

none

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-26T14:50:52Z/ Found at https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Found at https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N Found at https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

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low

none

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low

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low

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-26T14:50:52Z/ Found at https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-25545
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-25545
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

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low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.90084
EPSS Score 0.05142
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:41:25.787171+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/25xxx/CVE-2026-25545.json 38.6.0