---
id: CVE-2026-120252
title: >-
  imagecodecs 2023.1.23 through 2026.10.10 Stack Buffer Overflow via
  jpegsof3_decode()
summary: >-
  imagecodecs 2023.1.23 through 2026.10.10 contains a stack-based buffer
  overflow vulnerability in the lossless JPEG Define Huffman Table parser in
  decode_jpegsof3(). Attackers can supply a crafted lossless JPEG whose DHT
  symbol counts wra…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-121
vendor: cgohlke
product: imagecodecs
affected:
  - imagecodecs >= 2023.1.23 <= 2026.10.10
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-02T17:04:10.719726Z'
published: '2026-11-01'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T17:44:19.013Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120252'
references:
  - url: 'https://github.com/cgohlke/imagecodecs/issues/157'
    label: 'GitHub Issue #157'
  - url: >-
      https://github.com/cgohlke/imagecodecs/blob/v2026.10.10/3rdparty/jpegsof3/jpegsof3.cpp#L394
  - url: 'https://github.com/cgohlke/imagecodecs'
  - url: >-
      https://www.vulncheck.com/advisories/imagecodecs-2023.1.23-through-2026.10.10-stack-buffer-overflow-via-jpegsof3-decode
    label: >-
      VulnCheck Advisory: imagecodecs 2023.1.23 through 2026.10.10 Stack Buffer
      Overflow via jpegsof3_decode()
tags:
  - cve.org
epss: 0.00137
epssPercentile: 0.03106
ingestedAt: '2026-11-05T19:30:42.746Z'
---

## Overview

imagecodecs 2023.1.23 through 2026.10.10 contains a stack-based buffer overflow vulnerability in the lossless JPEG Define Huffman Table parser in decode_jpegsof3(). Attackers can supply a crafted lossless JPEG whose DHT symbol counts wrap an 8-bit sum, overflowing the 32-entry HufVal and HufSz stack arrays and crashing the calling process.

## Affected

- `imagecodecs >= 2023.1.23 <= 2026.10.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.