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TI-2026-03412 Aliases CVE-2026-3945GHSA-6vhj-8f7g-v7f7

tinyproxy Integer Overflow in HTTP Chunked Transfer-Encoding Parser Leading to Denial of Service

Priority MEDIUM 45CWE-190Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.

Summary

An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol without properly validating overflow conditions (e.g., errno == ERANGE).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00601 49th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
tinyproxytinyproxyup to 1.11.3—No fix listedCNA
  • tinyproxy Vendortinyproxy Affected up to 1.11.3 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-3945
  2. 2026-10-03 Alias added: GHSA-6vhj-8f7g-v7f7
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 3

Other 2

  • TI-2023-27093 Use after free in Tinyproxy CVSS 3.1CRITICAL 9.8
  • TI-2026-39266 Tinyproxy - HTTP Request Smuggling via Duplicate Content-Length Headers CVSS 4.0CRITICAL 9.3
  • TI-2001-00129 Buffer overflow in Tinyproxy HTTP proxy 1.3.3 and earlier allows remote attackers to… CVSS 2.0HIGH 10.0
  • TI-2026-39265 Tinyproxy - HTTP Request Smuggling via CL/TE Desynchronization CVSS 4.0CRITICAL 9.3
  • TI-2026-39882 Tinyproxy - Stathost Detection Bypass via Host Header Manipulation CVSS 4.0HIGH 8.8
  • TI-2002-00822 tinyproxy HTTP proxy 1.5.0, 1.4.3, and earlier allows remote attackers to execute… CVSS 2.0HIGH 7.5

Sources

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