7.5

CVE-2023-26103: deno

CVSS: 7.5v3.1HighModified
AliasesGHSA-jc97-h3h9-7xh6
Published 25-02-2023Last modified 11-03-2025
Open JSON

Vulnerability summary

CVE-2023-26103 is a high (CVSS 7.5) vulnerability in deno. EPSS estimates a 1.23% chance of exploitation in the next 30 days, higher than 68.6% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 25-02-2023
    PublishedVulnerability first disclosed.
  2. 11-03-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

1.23%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

0.00 pp

From 1.23% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.23%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (security.snyk.io)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Crates.Io1 product
  • deno≥ 1.12.0, < 1.31.0
Deno1 product

2 vendors · 2 products

References

9 links