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Vulnerability details: VCID-u6ba-98xk-ybdx
Vulnerability ID VCID-u6ba-98xk-ybdx
Aliases CVE-2024-56159
GHSA-49w6-73cw-chjr
Summary Astro is a web framework for content-driven websites. A bug in the build process allows any unauthenticated user to read parts of the server source code. During build, along with client assets such as css and font files, the sourcemap files **for the server code** are moved to a publicly-accessible folder. Any outside party can read them with an unauthorized HTTP GET request to the same server hosting the rest of the website. While some server files are hashed, making their access obscure, the files corresponding to the file system router (those in `src/pages`) are predictably named. For example. the sourcemap file for `src/pages/index.astro` gets named `dist/client/pages/index.astro.mjs.map`. This vulnerability is the root cause of issue #12703, which links to a simple stackblitz project demonstrating the vulnerability. Upon build, notice the contents of the `dist/client` (referred to as `config.build.client` in astro code) folder. All astro servers make the folder in question accessible to the public internet without any authentication. It contains `.map` files corresponding to the code that runs on the server. All **server-output** projects on Astro 5 versions **v5.0.3** through **v5.0.7**, that have **sourcemaps enabled**, either directly or through an add-on such as `sentry`, are affected. The fix for **server-output** projects was released in **astro@5.0.8**. Additionally, all **static-output** projects built using Astro 4 versions **4.16.17 or older**, or Astro 5 versions **5.0.8 or older**, that have **sourcemaps enabled** are also affected. The fix for **static-output** projects was released in **astro@5.0.9**, and backported to Astro v4 in **astro@4.16.18**. The immediate impact is limited to source code. Any secrets or environment variables are not exposed unless they are present verbatim in the source code. There is no immediate loss of integrity within the the vulnerable server. However, it is possible to subsequently discover another vulnerability via the revealed source code . There is no immediate impact to availability of the vulnerable server. However, the presence of an unsafe regular expression, for example, can quickly be exploited to subsequently compromise the availability. The fix for **server-output** projects was released in **astro@5.0.8**, and the fix for **static-output** projects was released in **astro@5.0.9** and backported to Astro v4 in **astro@4.16.18**. Users are advised to update immediately if they are using sourcemaps or an integration that enables sourcemaps.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-219 Storage of File with Sensitive Data Under Web Root
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 0.1078 https://api.first.org/data/v1/epss?cve=CVE-2024-56159
cvssv4 7.8 https://github.com/getsentry/sentry-javascript/blob/develop/packages/astro/src/integration/index.ts#L50
generic_textual HIGH https://github.com/getsentry/sentry-javascript/blob/develop/packages/astro/src/integration/index.ts#L50
ssvc Track https://github.com/getsentry/sentry-javascript/blob/develop/packages/astro/src/integration/index.ts#L50
cvssv4 7.8 https://github.com/withastro/astro
generic_textual HIGH https://github.com/withastro/astro
cvssv4 7.8 https://github.com/withastro/astro/blob/176fe9f113fd912f9b61e848b00bbcfecd6d5c2c/packages/astro/src/core/build/static-build.ts#L139
generic_textual HIGH https://github.com/withastro/astro/blob/176fe9f113fd912f9b61e848b00bbcfecd6d5c2c/packages/astro/src/core/build/static-build.ts#L139
ssvc Track https://github.com/withastro/astro/blob/176fe9f113fd912f9b61e848b00bbcfecd6d5c2c/packages/astro/src/core/build/static-build.ts#L139
cvssv4 7.8 https://github.com/withastro/astro/commit/039d022b1bbaacf9ea83071d27affc5318e0e515
generic_textual HIGH https://github.com/withastro/astro/commit/039d022b1bbaacf9ea83071d27affc5318e0e515
cvssv4 7.8 https://github.com/withastro/astro/commit/c879f501ff01b1a3c577de776a1f7100d78f8dd5
generic_textual HIGH https://github.com/withastro/astro/commit/c879f501ff01b1a3c577de776a1f7100d78f8dd5
cvssv4 7.8 https://github.com/withastro/astro/issues/12703
generic_textual HIGH https://github.com/withastro/astro/issues/12703
ssvc Track https://github.com/withastro/astro/issues/12703
cvssv4 7.8 https://github.com/withastro/astro/security/advisories/GHSA-49w6-73cw-chjr
generic_textual HIGH https://github.com/withastro/astro/security/advisories/GHSA-49w6-73cw-chjr
ssvc Track https://github.com/withastro/astro/security/advisories/GHSA-49w6-73cw-chjr
cvssv4 7.8 https://nvd.nist.gov/vuln/detail/CVE-2024-56159
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2024-56159
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2024-56159
https://github.com/withastro/astro
https://github.com/withastro/astro/commit/039d022b1bbaacf9ea83071d27affc5318e0e515
https://github.com/withastro/astro/commit/c879f501ff01b1a3c577de776a1f7100d78f8dd5
https://nvd.nist.gov/vuln/detail/CVE-2024-56159
12703 https://github.com/withastro/astro/issues/12703
GHSA-49w6-73cw-chjr https://github.com/advisories/GHSA-49w6-73cw-chjr
GHSA-49w6-73cw-chjr https://github.com/withastro/astro/security/advisories/GHSA-49w6-73cw-chjr
index.ts#L50 https://github.com/getsentry/sentry-javascript/blob/develop/packages/astro/src/integration/index.ts#L50
static-build.ts#L139 https://github.com/withastro/astro/blob/176fe9f113fd912f9b61e848b00bbcfecd6d5c2c/packages/astro/src/core/build/static-build.ts#L139
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L Found at https://github.com/getsentry/sentry-javascript/blob/develop/packages/astro/src/integration/index.ts#L50
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)

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Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-20T20:44:11Z/ Found at https://github.com/getsentry/sentry-javascript/blob/develop/packages/astro/src/integration/index.ts#L50
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L 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)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L Found at https://github.com/withastro/astro/blob/176fe9f113fd912f9b61e848b00bbcfecd6d5c2c/packages/astro/src/core/build/static-build.ts#L139
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)

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Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-20T20:44:11Z/ Found at https://github.com/withastro/astro/blob/176fe9f113fd912f9b61e848b00bbcfecd6d5c2c/packages/astro/src/core/build/static-build.ts#L139
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L Found at https://github.com/withastro/astro/commit/039d022b1bbaacf9ea83071d27affc5318e0e515
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)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L Found at https://github.com/withastro/astro/commit/c879f501ff01b1a3c577de776a1f7100d78f8dd5
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)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L Found at https://github.com/withastro/astro/issues/12703
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)

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Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-20T20:44:11Z/ Found at https://github.com/withastro/astro/issues/12703
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L Found at https://github.com/withastro/astro/security/advisories/GHSA-49w6-73cw-chjr
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)

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Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-20T20:44:11Z/ Found at https://github.com/withastro/astro/security/advisories/GHSA-49w6-73cw-chjr
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L Found at https://nvd.nist.gov/vuln/detail/CVE-2024-56159
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)

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Exploit Prediction Scoring System (EPSS)
Percentile 0.93512
EPSS Score 0.1078
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-10T18:34:15.490339+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2024/56xxx/CVE-2024-56159.json 38.6.0