CVE-2026-34077

highEPSS 0.005 · 38 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.45% (38th) EPSS

CVSS 7.5 · high

Is it mine?

22 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-19

React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · security-advisories@github.comexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

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

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USCWE-770US

affected products (22)

Products and version ranges known to be affected.

Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Atlassian Bamboo≤ Data Center <10.2.20cert_bundDE
Atlassian Bamboo≤ Data Center <12.1.8cert_bundDE
Atlassian Bitbucket≤ Data Center <10.2.4cert_bundDE
Atlassian Bitbucket≤ Data Center <10.3.1cert_bundDE
Atlassian Bitbucket≤ Data Center <9.4.21cert_bundDE
Atlassian Confluence≤ Data Center <10.2.13cert_bundDE
Atlassian Confluence≤ Data Center <9.2.21cert_bundDE
Atlassian Crucible< 4.9.11cert_bundDE
Atlassian Fisheye< 4.9.11cert_bundDE
Atlassian Jira≤ Data Center <10.3.22cert_bundDE
Atlassian Jira≤ Data Center <11.3.7cert_bundDE
Atlassian Jira≤ Service Management Data Center and Server <10.3.22cert_bundDE
Atlassian Jira≤ Service Management Data Center and Server <11.3.7cert_bundDE
Dell Secure Connect Gateway< 5.36.00.16cert_bundDE
remix-run react-router7.0.0, → 7.14.0enisa_euvdEU
remix-run turbo-stream≤ < 3.0.0enisa_euvdEU
shopify react-router7.0.0 → 7.14.0nvdUScpe:2.3:a:shopify:react-router:*:*:*:*:*:*:*:*
turbo-stream turbo stream< 3.0.0nvdUScpe:2.3:a:turbo-stream:turbo_stream:*:*:*:*:*:*:*:*

showing 20 of 22

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1955Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: Mehrere SchwachstellenDeutsch2026-06-16csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management ausnutzen, um beliebigen Code auszuführen, erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand auszulösen.
WID-SEC-W-2026-3046IBM Concert: Mehrere SchwachstellenDeutsch2026-08-26csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in IBM Concert ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, um einen SQL-Injection Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.
GHSA-rxv8-25v2-qmq8React Router vulnerable to Denial of Service via reflected user input in single-fetch2026-06-04ghsa · osvUS
A DoS vulnerability exists in the React Router v7 [Framework Mode](https://reactrouter.com/start/modes#framework), as well as Remix v2.9.0+ with [Single Fetch](https://v2.remix.run/docs/guides/single-fetch) enabled. In some scenarios the underlying serialization algorithm can become a bottleneck when encoding specific types of data into server responses. Please upgrade to React Router v7.14.0 or later. > [!NOTE] > This does not impact your React Router application if you are using [Declarative Mode](https://reactrouter.com/start/modes#declarative) (`<BrowserRouter>`) or [Data Mode](https://reactrouter.com/start/modes#data) (`createBrowserRouter`/`<RouterProvider>`).

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2026-06-02modified 2026-07-22

references (4)

External citations — patches, advisories, analysis.

scry

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