CVE-2025-49826
Next.js DoS vulnerability via cache poisoning
Next.js is a React framework for building full-stack web applications. From versions 15.0.4-canary.51 to before 15.1.8, a cache poisoning bug leading to a Denial of Service (DoS) condition was found in Next.js. This issue does not impact customers hosted on Vercel. Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page. This issue has been addressed in version 15.1.8.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Next.js DoS vulnerability via cache poisoning
Next.js is a React framework for building full-stack web applications. From versions 15.0.4-canary.51 to before 15.1.8, a cache poisoning bug leading to a Denial of Service (DoS) condition was found in Next.js. This issue does not impact customers hosted on Vercel. Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page. This issue has been addressed in version 15.1.8.
- Record
CVE-2025-49826- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-444
- Updated
- 2026-11-02
EUVDEUVD-2025-19910
Next.js is a React framework for building full-stack web applications. From versions 15.0.4-canary.51 to before 15.1.8, a cache poisoning bug leading to a Denial of Service (DoS) condition was found in Next.js. This issue does not impact customers hosted on Vercel. Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page. This issue has been addressed in version 15.1.8.
- Record
EUVD-2025-19910- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-67rr-84xm-4c7r
Next.JS vulnerability can lead to DoS via cache poisoning
Summary
A vulnerability affecting Next.js has been addressed. It impacted versions 15.0.4 through 15.1.8 and involved a cache poisoning bug leading to a Denial of Service (DoS) condition.
Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page
More details: CVE-2025-49826
Credits
- Allam Rachid zhero;
- Allam Yasser (inzo)
- Record
GHSA-67rr-84xm-4c7r- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-444
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-8h8q-6873-q5fj
Next.js Vulnerable to Denial of Service with Server Components
A vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23870.
A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage. This can result in denial of service in unpatched environments.
- Record
GHSA-8h8q-6873-q5fj- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-h25m-26qc-wcjf
Next.js HTTP request deserialization can lead to DoS when using insecure React Server Components
A vulnerability affects certain React Server Components packages for versions 19.0.x, 19.1.x, and 19.2.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23864.
A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage, out-of-memory exceptions, or server crashes. This can result in denial of service in unpatched environments.
- Record
GHSA-h25m-26qc-wcjf- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400, CWE-502
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-q4gf-8mx6-v5v3
Next.js has a Denial of Service with Server Components
A vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23869. You can read more about this advisory our this changelog.
A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage. This can result in denial of service in unpatched environments.
- Record
GHSA-q4gf-8mx6-v5v3- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
Show 12 moreShow less
NVD
Next.js is a React framework for building full-stack web applications. From versions 15.0.4-canary.51 to before 15.1.8, a cache poisoning bug leading to a Denial of Service (DoS) condition was found in Next.js. This issue does not impact customers hosted on Vercel. Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page. This issue has been addressed in version 15.1.8.
- Record
CVE-2025-49826- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-444
- Updated
- 2026-11-02
OSV
Next.js DoS vulnerability via cache poisoning
Next.js is a React framework for building full-stack web applications. From versions 15.0.4-canary.51 to before 15.1.8, a cache poisoning bug leading to a Denial of Service (DoS) condition was found in Next.js. This issue does not impact customers hosted on Vercel. Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page. This issue has been addressed in version 15.1.8.
- Record
CVE-2025-49826- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-444
- Updated
- 2026-11-02
OSVGHSA-67rr-84xm-4c7r
Next.JS vulnerability can lead to DoS via cache poisoning
Summary
A vulnerability affecting Next.js has been addressed. It impacted versions 15.0.4 through 15.1.8 and involved a cache poisoning bug leading to a Denial of Service (DoS) condition.
Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page
More details: CVE-2025-49826
Credits
- Allam Rachid zhero;
- Allam Yasser (inzo)
- Record
GHSA-67rr-84xm-4c7r- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-444
- Updated
- 2026-11-02
OSVGHSA-8h8q-6873-q5fj
Next.js Vulnerable to Denial of Service with Server Components
A vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23870.
A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage. This can result in denial of service in unpatched environments.
- Record
GHSA-8h8q-6873-q5fj- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
OSVGHSA-h25m-26qc-wcjf
Next.js HTTP request deserialization can lead to DoS when using insecure React Server Components
A vulnerability affects certain React Server Components packages for versions 19.0.x, 19.1.x, and 19.2.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23864.
A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage, out-of-memory exceptions, or server crashes. This can result in denial of service in unpatched environments.
- Record
GHSA-h25m-26qc-wcjf- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400, CWE-502
- Updated
- 2026-11-02
OSVGHSA-q4gf-8mx6-v5v3
Next.js has a Denial of Service with Server Components
A vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23869. You can read more about this advisory our this changelog.
A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage. This can result in denial of service in unpatched environments.
- Record
GHSA-q4gf-8mx6-v5v3- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
OSVCLSA-2026-1791807020 No score
TuxCare security update for 9 packages (28 CVEs)
TuxCare rebuilt 9 packages to address 28 CVEs. Fixed in 15.1.2-tuxcare.2.
- Record
CLSA-2026-1791807020- Updated
- 2026-11-02
OSVCLSA-2026-1792346490 No score
TuxCare security update for @next/swc-linux-x64-gnu (28 CVEs)
TuxCare rebuilt @next/swc-linux-x64-gnu to address 28 CVEs. Fixed in 15.1.2-tuxcare.2.
- Record
CLSA-2026-1792346490- Updated
- 2026-11-02
OSVCLSA-2026-1792367406 No score
TuxCare security update for @next/swc-linux-arm64-gnu (28 CVEs)
TuxCare rebuilt @next/swc-linux-arm64-gnu to address 28 CVEs. Fixed in 15.1.2-tuxcare.2.
- Record
CLSA-2026-1792367406- Updated
- 2026-11-02
OSVROOT-APP-NPM-GHSA-8h8q-6873-q5fj No score
GHSA-8h8q-6873-q5fj in next - Patched by Root
Root has patched GHSA-8h8q-6873-q5fj in the next package for Root:npm. Multiple fixed versions available.
- Record
ROOT-APP-NPM-GHSA-8h8q-6873-q5fj- Updated
- 2026-11-02
OSVROOT-APP-NPM-GHSA-h25m-26qc-wcjf No score
GHSA-h25m-26qc-wcjf in next - Patched by Root
Root has patched GHSA-h25m-26qc-wcjf in the next package for Root:npm. Multiple fixed versions available.
- Record
ROOT-APP-NPM-GHSA-h25m-26qc-wcjf- Updated
- 2026-11-02
OSVROOT-APP-NPM-GHSA-q4gf-8mx6-v5v3 No score
GHSA-q4gf-8mx6-v5v3 in next - Patched by Root
Root has patched GHSA-q4gf-8mx6-v5v3 in the next package for Root:npm. Multiple fixed versions available.
- Record
ROOT-APP-NPM-GHSA-q4gf-8mx6-v5v3- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
nextnpm |
15.0.4-canary.51 up to 15.1.8 | 15.1.8 |
nextnpm |
13.0.0 up to 15.5.16 | 15.5.16 |
nextnpm |
16.0.0 up to 16.2.5 | 16.2.5 |
nextnpm |
13.0.0 up to 15.0.8 | 15.0.8 |
nextnpm |
15.1.1-canary.0 up to 15.1.12 | 15.1.12 |
nextnpm |
15.2.0-canary.0 up to 15.2.9 | 15.2.9 |
nextnpm |
15.3.0-canary.0 up to 15.3.9 | 15.3.9 |
nextnpm |
15.4.0-canary.0 up to 15.4.11 | 15.4.11 |
nextnpm |
15.5.1-canary.0 up to 15.5.10 | 15.5.10 |
nextnpm |
15.6.0-canary.0 up to 15.6.0-canary.61 | 15.6.0-canary.61 |
Show 10 moreShow less
| Package | Affected | Fixed |
|---|---|---|
nextnpm |
16.0.0-beta.0 up to 16.0.11 | 16.0.11 |
nextnpm |
16.1.0-canary.0 up to 16.1.5 | 16.1.5 |
nextnpm |
13.0.0 up to 15.5.15 | 15.5.15 |
nextnpm |
16.0.0-beta.0 up to 16.2.3 | 16.2.3 |
@next/swc-linux-x64-gnuTuxCare:npm From an advisory covering 22 CVEs |
15.1.2-tuxcare.0 up to 15.1.2-tuxcare.2, plus listed versions 15.1.215.1.2-tuxcare.1 |
15.1.2-tuxcare.2 |
@next/swc-linux-arm64-gnuTuxCare:npm From an advisory covering 22 CVEs |
15.1.2-tuxcare.0 up to 15.1.2-tuxcare.2, plus listed versions 15.1.215.1.2-tuxcare.1 |
15.1.2-tuxcare.2 |
nextRoot:npm |
before 14.2.5-aikido.5 | 14.2.5-aikido.514.2.5-aikido.814.2.35-aikido.914.2.30-aikido.714.2.26-aikido.614.2.26-aikido.414.2.30-aikido.1013.4.19-aikido.613.4.19-aikido.714.2.10-aikido.314.2.13-aikido.314.0.4-aikido.614.2.3-aikido.114.0.4-aikido.914.2.24-aikido.214.2.25-aikido.214.1.0-aikido.414.2.18-aikido.213.3.0-aikido.514.0.4-aikido.514.0.4-aikido.714.0.4-aikido.214.1.0-aikido.714.1.0-aikido.814.0.4-aikido.314.2.13-aikido.114.2.3-aikido.514.2.0-aikido.214.0.3-aikido.314.2.5-aikido.914.2.5-aikido.1014.2.2-aikido.714.2.10-aikido.114.2.29-aikido.514.2.31-aikido.214.2.18-aikido.114.0.0-aikido.714.2.10-aikido.414.2.13-aikido.414.2.10-aikido.214.2.18-aikido.614.2.21-aikido.614.2.16-aikido.614.1.4-aikido.514.2.25-aikido.113.2.4-aikido.314.2.0-aikido.614.0.4-aikido.414.2.31-aikido.514.2.0-aikido.514.2.2-aikido.914.2.30-aikido.813.1.6-aikido.113.2.4-aikido.414.0.3-aikido.614.0.0-aikido.514.2.5-aikido.214.2.5-aikido.314.2.3-aikido.313.5.11-aikido.713.5.4-aikido.514.2.5-aikido.413.3.0-aikido.614.2.30-aikido.314.0.3-aikido.414.2.13-aikido.214.2.5-aikido.614.2.21-aikido.414.0.0-aikido.314.1.4-aikido.714.2.21-aikido.214.2.16-aikido.214.2.16-aikido.413.5.4-aikido.214.2.30-aikido.413.2.4-aikido.513.3.0-aikido.714.2.26-aikido.314.0.3-aikido.514.2.30-aikido.915.5.10-aikido.414.1.4-aikido.813.5.4-aikido.614.2.16-aikido.514.0.0-aikido.614.2.21-aikido.514.2.5-aikido.714.2.3-aikido.414.2.2-aikido.813.4.19-aikido.414.2.15-aikido.514.2.30-aikido.514.2.3-aikido.215.5.10-aikido.514.2.28-aikido.514.1.4-aikido.913.2.4-aikido.216.1.6-aikido.416.1.7-aikido.113.5.6-aikido.514.2.15-aikido.616.1.6-aikido.515.5.15-aikido.214.1.3-aikido.813.2.4-aikido.714.2.32-aikido.814.2.29-aikido.414.2.33-aikido.513.5.6-aikido.613.5.11-aikido.814.2.26-aikido.515.5.10-aikido.614.2.26-aikido.214.0.4-aikido.814.2.28-aikido.314.2.31-aikido.314.1.4-aikido.614.2.18-aikido.313.3.0-aikido.414.1.0-aikido.516.1.7-aikido.214.2.16-aikido.314.0.0-aikido.414.1.0-aikido.313.5.11-aikido.614.2.18-aikido.413.5.4-aikido.314.2.31-aikido.114.1.4-aikido.314.2.0-aikido.313.4.19-aikido.515.5.15-aikido.316.1.6-aikido.614.2.31-aikido.414.1.4-aikido.413.5.4-aikido.415.5.15-aikido.416.1.6-aikido.716.1.7-aikido.313.3.0-aikido.813.1.6-aikido.214.2.21-aikido.313.2.4-aikido.613.5.11-aikido.914.2.0-aikido.414.2.30-aikido.614.2.28-aikido.414.2.33-aikido.614.1.0-aikido.615.5.10-aikido.316.1.6-aikido.814.2.18-aikido.513.5.6-aikido.714.2.35-aikido.1014.2.35-aikido.1116.2.5-aikido.116.2.5-aikido.316.2.5-aikido.214.2.33-aikido.214.2.32-aikido.414.2.15-aikido.414.1.3-aikido.214.2.15-aikido.314.2.32-aikido.114.2.33-aikido.114.1.3-aikido.514.2.29-aikido.114.2.32-aikido.514.2.33-aikido.314.2.2-aikido.514.2.2-aikido.614.2.30-aikido.114.2.30-aikido.214.1.3-aikido.614.2.35-aikido.514.2.33-aikido.414.2.35-aikido.314.2.32-aikido.614.2.35-aikido.614.1.3-aikido.714.2.32-aikido.214.2.32-aikido.714.2.28-aikido.114.2.35-aikido.214.2.28-aikido.214.2.35-aikido.714.0.0-aikido.214.2.29-aikido.214.2.21-aikido.114.2.16-aikido.114.1.3-aikido.314.2.32-aikido.314.2.29-aikido.314.1.3-aikido.414.2.35-aikido.814.2.35-aikido.414.2.35-aikido.1 |
@rootio/nextRoot:npm |
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nextRoot:npm |
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@rootio/nextRoot:npm |
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History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| affected | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-49826 is a high vulnerability (CVSS 7.5) in Vercel Next.js, published July 3, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.13%, the 66th percentile. Fixed in next 15.1.8.
References
github.com/vercel/next.js/security/advisories/GHSA-67rr-84xm-4c7r
vercel.com/changelog/cve-2025-49826
nvd.nist.gov/vuln/detail/CVE-2025-49826
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