CVE-2026-70606 json
Electron: ProtocolResponse.url reuses the default session cache instead of the registering session
published 3mo ago modified last mo. also EUVD-2026-53445 , GHSA-r4w5-6pfg-jxp5
- cvss
- 5.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 40.10.6, 41.9.1, 42.5.1, and 43.0.0, when a custom protocol handler returned a ProtocolResponse with a url and no session, Electron made the upstream request through defaultSession instead of the session that handled the protocol. A cached response could then be reused across otherwise isolated session partitions. Apps that use ProtocolResponse.url, omit ProtocolResponse.session, and rely on separate sessions to isolate content are affected. This issue is fixed in versions 40.10.6, 41.9.1, 42.5.1, and 43.0.0.
Patch / fix
- npm electron 40.10.6, 41.9.1, 42.5.1, 43.0.0
- atom electron 40.10.6, 41.9.1, 42.5.1, 43.0.0
- electronjs electron 40.10.6, 41.9.1, 42.5.1, 43.0.0
Is CVE-2026-70606 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N |
| GitHub | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | electron | >=43.0.0-alpha.1, <43.0.0 >=42.0.0-alpha.1, <42.5.1 >=41.0.0-alpha.1, <41.9.1 >=40.0.0-alpha.1, <40.10.6 |
43.0.0 42.5.1 41.9.1 40.10.6 |
Affected products
- electron electron
Classification
- Weakness
-
- CWE-668 Exposure of Resource to Wrong Sphere
References
-
github.com
/electron/electron/security/advisories/GHSA-r4w5-6pfg-jxp5
web, vendor-advisory, advisory
-
github.com
/electron/electron
package
Sources
- CVE List CVE-2026-70606
- GitHub Advisory GHSA-r4w5-6pfg-jxp5
- NVD CVE-2026-70606
- Maintainer advisory GHSA-r4w5-6pfg-jxp5
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of electron/electron published their own advisory on GitHub. Reviewed sources take precedence over it.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.