What is CVE-2025-55182?

CVE-2025-55182 is Meta React Server Components Remote Code Execution Vulnerability. The supplied enrichment data classifies it as Deserialization mapped to CWE-502 Deserialization of Untrusted Data.

Which versions are affected?

Affected product and version evidence is listed in the product table above. Current public advisories should be checked for exact version scope before patch targeting is finalized.

Is there active exploitation?

Yes: CISA KEV signal present. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

Is there a public exploit?

1 public PoC repositories reported; 0 marked weaponized in current dataset. Public exploit or PoC availability should raise triage priority, especially for exposed or business-critical systems.

How can defenders detect it?

Start with web/proxy/WAF logs, application logs, network IDS/IPS, EDR process telemetry, host service logs where available. Look for vulnerability-class behavior, product errors, suspicious authentication events, exploit probes, and abnormal process activity based only on evidence that applies to the affected product.

How should teams prioritize it?

Prioritize CVE-2025-55182 using CVSS 10, EPSS 100%, KEV status, public PoC status, and asset exposure. Internet-facing, privileged, or business-critical deployments should be handled first.

Are workarounds available?

The supplied mitigation guidance says to apply vendor patches and restrict external exposure until fixed. Fixed-version evidence is listed in the mitigation section above.

Which threat actors are linked publicly?

Publicly linked actor or ransomware signals in the supplied enrichment data: Ransomware use: Known. Do not attribute exploitation to a threat actor unless the source evidence explicitly supports that linkage.

What should be done in the next 24 hours?

Identify exposed assets running affected vendor/product/version combinations. Treat as emergency remediation because CISA KEV status is present. Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class. Open remediation tickets with affected assets, owners, evidence status, and detection coverage so decisions are traceable.

CISA KEVRansomwarecriticalDeserializationpublic exploit

CVE-2025-55182

CVE-2025-55182 — Meta React Server Components Remote Code Execution Vulnerability

Q: Is it in CISA KEV?

Yes. The supplied enrichment data lists CVE-2025-55182 in CISA KEV with required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

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, 2025Updated Aug 4, 2026Sources: NVD, Meta (CNA), CISA, FIRST EPSS, Exploit-DB, Red Hat (VEX)

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Confirmed

CISA KEV, listed Dec 5, 2025

EPSS

100%

top of FIRST's scoreset

Affects

CISA SSVC assessment

Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.

CISA

Exploitation

Active

none · proof-of-concept · active

Automatable

Yes

can an attacker script all four kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

The vendor's own words where we have them.

Upgrade react-server-dom-webpack to a fixed release. Apply vendor patches per advisory and restrict external exposure of the affected component until patched.

CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Federal deadline Dec 12, 2025 — passed 275 days ago

Red Hat VEX · CVE-2025-55182

fixed0affected0not affected33

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

Identify exposed assets running affected vendor/product/version combinations.
Treat as emergency remediation because CISA KEV status is present.
Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

Vendor	Product	Versions	Status
Meta	react-server-dom-webpack	19.0.0 to <= 19.0.0	Vulnerable
Meta	react-server-dom-webpack	19.1.0 to <= 19.1.1	Vulnerable
Meta	react-server-dom-webpack	19.2.0 to <= 19.2.0	Vulnerable
Meta	react-server-dom-turbopack	19.0.0 to <= 19.0.0	Vulnerable
Meta	react-server-dom-turbopack	19.1.0 to <= 19.1.1	Vulnerable
Meta	react-server-dom-turbopack	19.2.0 to <= 19.2.0	Vulnerable
Meta	react-server-dom-parcel	19.0.0 to <= 19.0.0	Vulnerable
Meta	react-server-dom-parcel	19.1.0 to <= 19.1.1	Vulnerable
Meta	react-server-dom-parcel	19.2.0 to <= 19.2.0	Vulnerable

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Availability

High

Confidentiality

High

Integrity

High

Scope

Changed

Attack Complexity

Low

Attack Vector

Network

Privileges Req

None

User Interaction

None

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
10	CVSS 3.1	critical	3.9	6	Meta (CNA), Red Hat (VEX)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness & attack patterns

CWE-502Deserialization of Untrusted Data

Inferred from the weakness class — not observed against this CVE.

CAPEC-586 · Object InjectionCAPEC-242 · Code Injection

CISA KEV details

CISA lists a CVE here once it has evidence of exploitation against real targets.

CISAThat month →

Listed

Dec 5, 2025

Federal deadline

Dec 12, 2025

passed 275 days ago

Ransomware use

Known

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a date to argue against.

Public exploit

Capability, not use: code existing is a different claim from anyone running it.

Exploit entries

Exploit-DB and CTI exploit indexes

Detection

Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.

Prioritize edge telemetry for network-reachable react-server-dom-webpack, react-server-dom-turbopack, react-server-dom-parcel.
Monitor for scanner or exploit-pattern traffic after 1 public PoC repositories were reported.

web/proxy/WAF logsapplication logsnetwork IDS/IPSEDR process telemetryhost service logs

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

2026
Added · CVSS 3.1 10.0 (AV:N)
Aug 4, 2026 · NVD
Added · webapps entry: React Server 19.2.0 - Remote Code Execution
Apr 9, 2026 · Exploit-DB
2025
Added to CISA KEV catalog
Dec 5, 2025 · CISA
Initial · CVE published
Dec 3, 2025 · NVD

References

13 on the record

react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components
Patch, Vendor Advisory
www.facebook.com/security/advisories/cve-2025-55182
Vendor Advisory
www.openwall.com/lists/oss-security/2025/12/03/4
Mailing List, Patch, Third Party Advisory
news.ycombinator.com/item?id=46136026
Issue Tracking
aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/
Third Party Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182
US Government Resource
www.exploit-db.com/exploits/52506
Vendor Advisory
access.redhat.com/security/cve/CVE-2025-55182
Vendor Advisory

Elsewhere on this site

Metaevery CVE for this vendor
December 2025what else CISA listed
Deserializationsame class
CWE-502other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record1

What should defenders know first?

CVE-2025-55182 is Meta React Server Components Remote Code Execution Vulnerability, a critical vulnerability affecting react-server-dom-webpack, react-server-dom-turbopack, react-server-dom-parcel from Meta. The current evidence lists it in CISA KEV, and the exploit status is: Yes: CISA KEV signal present. Public exploit evidence is: 1 public PoC repositories reported; 0 marked weaponized in current dataset. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 10 describes technical severity, while EPSS 100% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.