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CVE-2026-120252— imagecodecs 2023.1.23 through 2026.10.10 Stack Buffer Overflow via jpegsof3_decode()

Quick assessment

Affected
cgohlke imagecodecs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

imagecodecs 2023.1.23 至 2026.10.10 版本在 函数的无损 JPEG 定义霍夫曼表（Define Huffman Table, DHT）解析器中存在基于栈的缓冲区溢出漏洞。攻击者可构造一个特制的无损 JPEG 文件，使其 DHT 符号计数在 8 位求和时发生回绕，从而导致 32 个条目的 和 栈数组溢出，最终造成调用进程崩溃。

CVSS 5.5 · Medium EPSS 0.14% · P3

Affected Version Matrix 1

VendorProduct Version RangeStatus
cgohlke imagecodecs 2023.1.23≤ 2026.10.10 affected
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I. Basic Information for CVE-2026-120252

Vulnerability Information
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Vulnerability Title
imagecodecs 2023.1.23 through 2026.10.10 Stack Buffer Overflow via jpegsof3_decode()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
cgohlke imagecodecs 2023.1.23 ~ 2026.10.10 -

II. Public POCs for CVE-2026-120252

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III. Intelligence Information for CVE-2026-120252

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Other References for CVE-2026-120252 (4)

IV. Related Vulnerabilities

Same product: imagecodecs
Same vendor: cgohlke
Same weakness: CWE-121