cve.bz

CVE-2023-26103

7.5 highEPSS 1.2%

High (7.5) in deno deno. EPSS 1.2% chance of exploitation in the next 30 days. Fixed in deno 1.31.0.

Versions of the package deno before 1.31.0 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the upgradeWebSocket function, which contains regexes in the form of /s*,s*/, used for splitting the Connection/Upgrade header. A specially crafted Connection/Upgrade header can be used to significantly slow down a web socket server.

Severity

CVSS 3.1

7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
1.2% chance of exploitation in the next 30 days; higher than 68% of CVEs (scores of 2026-10-31)
CWE
CWE-1333
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-jc97-h3h9-7xh6crates.iodeno>=1.12.0 <1.31.01.31.0

References

Check your stackJSON