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CVE-2023-26103

HIGH
7.5
CVSS Score
Published: February 25, 2023 at 05:00 AM UTC
Updated: June 17, 2026 at 05:42 AM UTC
1 product affected across 1 vendorDeno

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Deno· Denocargo
95%
v < 1.31.0
Affected range stops below 1.31.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Broken Link
Source: [email protected]
https://github.com/denoland/deno/blob/2b247be517d789a37e532849e2e40b724af0918f/ext/http/01_http.js%23L395-L409
Patch
Source: [email protected]
https://github.com/denoland/deno/commit/cf06a7c7e672880e1b38598fe445e2c50b4a9d06
Patch
Source: [email protected]
https://github.com/denoland/deno/pull/17722
Release Notes
Source: [email protected]
https://github.com/denoland/deno/releases/tag/v1.31.0
ExploitTechnical DescriptionThird Party Advisory
Source: [email protected]
https://security.snyk.io/vuln/SNYK-RUST-DENO-3315970

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-1333

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