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TI-2026-86758 Aliases CVE-2026-123616GHSA-97wv-7mx5-f6w4

Memory exhaustion in imgproxy ICO loader enables denial of service

Priority MEDIUM 53CWE-789Published · 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
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-789.

Summary

imgproxy from 3.3.0 before 4.0.16 fails to validate the data_size field in its ICO loader, so it makes an unbounded memory allocation (CWE-789). An unauthenticated remote attacker can supply a crafted 23-byte ICO file declaring a data_size of about 4GB, which exhausts memory and crashes workers.

Written with Claude Haiku 5.5 from the sources below · 2026-11-08

Description from the CNA

imgproxy from 3.3.0 before 4.0.16 contains an unbounded memory allocation vulnerability in the ICO loader that fails to validate the data_size field. Attackers can supply a crafted 23-byte ICO file declaring a ~4GB data_size to trigger memory exhaustion and worker crashes without authentication.

Why it matters now

Fix Fixed imgproxy (imgproxy): 4.0.16

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
imgproxyimgproxy3.3.0 to before 4.0.164.0.16Patch availableCNA
  • imgproxy Vendorimgproxy Affected 3.3.0 to before 4.0.16 Fixed in 4.0.16 Patch available CNA

Remediation

Update imgproxy to version 4.0.16 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-11-08

  • Fix · CNA imgproxy (imgproxy) Fixed in 4.0.16

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    imgproxy 4.0.16

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2026-86756 Heap buffer overflow in imgproxy ICO loader lets attackers crash or run codePriority MEDIUM 55
    Show all 2 records →

Timeline

  1. 2026-11-08 Threatist record created from CVE-2026-123616
  2. 2026-11-08 Alias added: GHSA-97wv-7mx5-f6w4

References

Advisory 1

  • TI-2026-86756 Heap buffer overflow in imgproxy ICO loader lets attackers crash or run code CVSS 4.0CRITICAL 9.3
  • TI-2026-86757 Out-of-bounds write in imgproxy ICO loader crashes worker CVSS 4.0HIGH 8.7
  • TI-2025-18097 imgproxy is vulnerable to SSRF against 0.0.0.0 CVSS 3.1MEDIUM 5.3

Sources

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