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TI-2026-65678 Aliases CVE-2026-103387GHSA-cw9r-3wqp-32hm

garycourt uri-js Mailto Header mailto.ts URI.parse uncaught exception

Priority MEDIUM 57CWE-248Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-248.

Summary

A weakness has been identified in garycourt uri-js up to 4.4.1. This affects the function URI.parse of the file src/schemes/mailto.ts of the component Mailto Header Handler. This manipulation of the argument to causes uncaught exception. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00319 25th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
garycourturi-js4.4.0; 4.4.1—No fix listedCNA
  • uri-js Vendorgarycourt Affected 4.4.0; 4.4.1 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:garycourt:uri-js:*:*:*:*:*:*:*:*——garycourt
  • cpe:2.3:a:garycourt:uri-js:*:*:*:*:*:*:*:* Versions — — ·garycourt

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-103387
  2. 2026-10-03 Alias added: GHSA-cw9r-3wqp-32hm

References

Exploit 1

Other 1

  • TI-2026-63101 uri-js through 4.4.1 Denial of Service via removeDotSegments CVSS 4.0HIGH 8.7
  • TI-2026-63117 uri-js through 4.4.1 Improper UTF-8 Decoding via pctDecChars CVSS 4.0MEDIUM 6.9
  • TI-2017-11746 Uncontrolled resource consumption in HackerOne uri-js node module CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences