Infinite Loop Vulnerability in imagecodecs by CGohlke
CVE-2026-120251

6.8MEDIUM

Key Information:

Vendor

Cgohlke

Status
Imagecodecs
Vendor
CVE Published:
1 November 2026

What is CVE-2026-120251?

The imagecodecs library versions 2026.3.6 through 2026.10.10 has a vulnerability that can lead to an infinite loop when the ccitt_fax4_decode_size() function is exploited. By providing a specially crafted CCITT Group 4 stream that lacks the End Of File Block (EOFB), attackers can cause the process to consume excessive CPU resources, potentially leading to a denial of service as the process becomes unresponsive. This highlights the importance of validating input streams to prevent such exploits.

Affected Version(s)

imagecodecs 2026.3.6 <= 2026.10.10

References

https://github.com/cgohlke/imagecodecs/issues/158
issue-tracking
https://github.com/cgohlke/imagecodecs/blob/v2026.10.10/3...
technical-description
https://github.com/cgohlke/imagecodecs
product

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Dilanka Kaushal Hewage (r3vpwnx)
.