CVE-2025-55182: A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0…
Noroxi assessment
Priority: Now (action score 100/100)
- CISA has confirmed exploitation in the wild (Dec 5, 2025); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: Dec 12, 2025.
- A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
- Probability of exploitation in the next 30 days: 99.7% (FIRST EPSS); higher than 99.9% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: react-server-dom-parcel (npm) 19.0.1, 19.1.2, 19.2.1; react-server-dom-turbopack (npm) 19.0.1, 19.1.2, 19.2.1; react-server-dom-webpack (npm) 19.0.1, 19.1.2, 19.2.1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Patch today or shut off access. Upgrade to react-server-dom-parcel (npm) 19.0.1, 19.1.2, 19.2.1; react-server-dom-turbopack (npm) 19.0.1, 19.1.2, 19.2.1; react-server-dom-webpack (npm) 19.0.1, 19.1.2, 19.2.1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS
A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. The vulnerable code unsafely deserializes payloads from HTTP requests to Server Function endpoints.
- Published
- Dec 3, 2025
- Updated
- Oct 18, 2026
- EPSS
- 99.7% · 99th percentile
- CWE
- CWE-502
Report tools
Action score
100
Patch today or shut off access.
- CVSS
- 40 / 40 · 10.0 / 10
- CISA KEV
- 30 / 30 · Listed
- EPSS
- 30 / 30 · 99.7%
CISA SSVC decision
- Exploitation
- active
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Meta
- 10.0
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Actively exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on Dec 5, 2025. That signals real attacks, not theory.
Remediation deadline for US federal agencies: Dec 12, 2025.
Known to be used in ransomware campaigns.
Get told when this record changes
- In CISA KEV: exploitation in the wild confirmed
- Weaponized exploit exists
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Meta). Independent of NVD's CPE analysis and usually ahead of it.
Meta react-server-dom-parcel
- 19.0.0 and later · up to and including 19.0.0affected · semver
- 19.1.0 and later · up to and including 19.1.1affected · semver
- 19.2.0 and later · up to and including 19.2.0affected · semver
Meta react-server-dom-turbopack
- 19.0.0 and later · up to and including 19.0.0affected · semver
- 19.1.0 and later · up to and including 19.1.1affected · semver
- 19.2.0 and later · up to and including 19.2.0affected · semver
Meta react-server-dom-webpack
- 19.0.0 and later · up to and including 19.0.0affected · semver
- 19.1.0 and later · up to and including 19.1.1affected · semver
- 19.2.0 and later · up to and including 19.2.0affected · semver
Affected versions · NVD (14)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- facebook react19.0.0
- facebook react19.1.0
- facebook react19.1.1
- facebook react19.2.0
- vercel next.js15.0.0 and later · before 15.0.5
- vercel next.js15.1.0 and later · before 15.1.9
- vercel next.js15.2.0 and later · before 15.2.6
- vercel next.js15.3.0 and later · before 15.3.6
- vercel next.js15.4.0 and later · before 15.4.8
- vercel next.js15.5.0 and later · before 15.5.7
- vercel next.js16.0.0 and later · before 16.0.7
- vercel next.js14.3.0
- vercel next.js15.6.0
- vercel next.js16.0.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| npm | react-server-dom-parcel | from 19.0.0 · before 19.0.1 | 19.0.1 |
| npm | react-server-dom-parcel | from 19.1.0 · before 19.1.2 | 19.1.2 |
| npm | react-server-dom-parcel | from 19.2.0 · before 19.2.1 | 19.2.1 |
| npm | react-server-dom-turbopack | from 19.0.0 · before 19.0.1 | 19.0.1 |
| npm | react-server-dom-turbopack | from 19.1.0 · before 19.1.2 | 19.1.2 |
| npm | react-server-dom-turbopack | from 19.2.0 · before 19.2.1 | 19.2.1 |
| npm | react-server-dom-webpack | from 19.0.0 · before 19.0.1 | 19.0.1 |
| npm | react-server-dom-webpack | from 19.1.0 · before 19.1.2 | 19.1.2 |
| npm | react-server-dom-webpack | from 19.2.0 · before 19.2.1 | 19.2.1 |
Same product
facebook: all recordsOther highest-scoring records for the same primary product.
- CVE-2025-55184A pre-authentication denial of service vulnerability exists in React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.49Plan
- CVE-2025-67779It was found that the fix addressing CVE-2025-55184 in React Server Components was incomplete and does not prevent a denial of service…35Monitor
- CVE-2026-23864Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel…31Monitor
Published before and after this one in the same product
- ← EarlierCVE-2018-6341Dec 31, 2018 · React applications which rendered to HTML using the ReactDOMServer API were not escaping user-supplied attribute names at render-time.25Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| npm:react-server-dom-parcel | 19.0.1 | Package registry (OSV) |
| npm:react-server-dom-parcel | 19.1.2 | Package registry (OSV) |
| npm:react-server-dom-parcel | 19.2.1 | Package registry (OSV) |
| npm:react-server-dom-turbopack | 19.0.1 | Package registry (OSV) |
| npm:react-server-dom-turbopack | 19.1.2 | Package registry (OSV) |
| npm:react-server-dom-turbopack | 19.2.1 | Package registry (OSV) |
| npm:react-server-dom-webpack | 19.0.1 | Package registry (OSV) |
| npm:react-server-dom-webpack | 19.1.2 | Package registry (OSV) |
| npm:react-server-dom-webpack | 19.2.1 | Package registry (OSV) |
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
- Exploit-DB entry ×1
- Nuclei detection template ×1
- Proof-of-concept repository on GitHub ×50
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | 50 repositories | 2022-06-17 → 2025-12-04 |
| Exploit-DB entry | webapps | 2026-04-09 |
| Metasploit module | exploit/multi/http/react2shell_unauth_rce_cve_2025_55182Unauthenticated RCE in React Server Components (React2Shell)exploit | 2025-12-03 |
| Nuclei detection template | Nuclei template CVE-2025-55182 | — |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- First PoC-1266 d
- Metasploit-1 d
- Published
- CISA KEV+1 d
- TodayNov 14, 2026+345 d
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2025-551848 days apartA pre-authentication denial of service vulnerability exists in React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.49Plan
- CVE-2025-677799 days apartIt was found that the fix addressing CVE-2025-55184 in React Server Components was incomplete and does not prevent a denial of service…35Monitor
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-25-0428 · Dec 5, 2025(JavaScript (React) Güvenlik Zafiyeti)
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-502 · Deserialization of Untrusted DataCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
nvd-secondary
Root cause
Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.
The bug in code
The whole CWE-502 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
payload = sock.recv(65536)
job = pickle.loads(payload)Fixed
payload = sock.recv(65536)
if not hmac.compare_digest(sign(payload), header_sig):
raise PermissionError("invalid signature")
job = JobSchema.validate(json.loads(payload))Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (5 more)Show less
- www.facebook.com/security/advisories/cve-2025-55182
- www.openwall.com/lists/oss-security/2025/12/03/4
- news.ycombinator.com/item?id=46136026
- aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182
Vendor advisories and official records. Exploit/PoC links are deliberately left out.