CVE-2026-44576

mediumpriority · track · 0EPSS 0.003 · 22 %ileDEEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.29% (22nd) EPSS
CVSS 5.4 · medium
Is it mine?
13 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Next.js is a React framework for building full-stack web applications. From 14.2.0 to before 15.5.16 and 16.2.5, applications using React Server Components can be vulnerable to cache poisoning when shared caches do not correctly partition response variants. Under affected conditions, an attacker can cause an RSC response to be served from the original URL and poison shared cache entries so later visitors receive component payloads instead of the expected HTML. This vulnerability is fixed in 15.5.16 and 16.2.5.

01

cvss

Technical severity, 0–10. One row per scoring source.

5.4
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.4mediumAV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:Lsecondary · FSTEC (BDU) RU
v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:Lsecondary · ENISA EU
v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:Lsecondary · security-advisories@github.comexploitability 2.2 · impact 2.7
v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:Lsecondary · OSV
v3.15mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:L/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-436USCWE-436USCWE-436US
04

affected products (13)

Products and version ranges known to be affected.

05

advisories (2)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-1401Vercel Next.js: Mehrere SchwachstellenDeutsch2026-05-06csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Vercel Next.js ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Cross-Site-Scripting-Angriffe durchzuführen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.

  • GHSA-wfc6-r584-vfw7Next.js vulnerable to cache poisoning in React Server Component responses2026-05-11ghsa · osvUS

    ### Impact Applications using React Server Components can be vulnerable to cache poisoning when shared caches do not correctly partition response variants. Under affected conditions, an attacker can cause an RSC response to be served from the original URL and poison shared cache entries so later visitors receive component payloads instead of the expected HTML. ### Fix We now validate and interpret `RSC` request headers consistently across request classification and rendering, and we enforce the intended cache-busting behavior so RSC payloads are not unexpectedly served from the original URL. ### Workarounds If you cannot upgrade immediately, ensure your CDN or reverse proxy keys on the relevant RSC request headers and honors `Vary`, or disable shared caching for affected App Router and RSC responses.

06

also known as (4)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundnvdosvNVDCVE.orgMITRE
published 2026-05-13modified 2026-10-26
08

references (4)

External citations — patches, advisories, analysis.

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