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CVE-2026-111124— CFITSIO through 4.7.0 Heap Out-of-Bounds Read via Negative ZDITHER0 Seed

Quick assessment

Affected
HEASARC cfitsio
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.

CFITSIO 版本 4.7.0 及之前版本在 imcompress.c 文件的 unquantize 辅助函数中存在基于堆的越界读取漏洞。攻击者可通过提供为零或负数的 ZDITHER0 种子值，导致程序读取 fits_rand_value 表之前的内存数据。攻击者可以构造一个包含 SUBTRACTIVE_DITHER_1 压缩图像的恶意 FITS 文件，通过 fits_open_file() 和 fits_read_pix() 函数打开并读取该文件，从而引发程序崩溃或在解码像素中泄露堆内存内容。

CVSS 6.1 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
HEASARC cfitsio ≤ 4.7.0 affected
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I. Basic Information for CVE-2026-111124

Vulnerability Information
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Vulnerability Title
CFITSIO through 4.7.0 Heap Out-of-Bounds Read via Negative ZDITHER0 Seed
Source: CVE Program / CVE List V5
Vulnerability Description
CFITSIO through 4.7.0 contains a heap-based out-of-bounds read vulnerability in the imcompress.c unquantize helpers that allows attackers to read memory before the fits_rand_value table via a zero or negative ZDITHER0 seed. Attackers can supply a crafted FITS file with a SUBTRACTIVE_DITHER_1 compressed image, read through fits_open_file() and fits_read_pix(), to cause crashes or leak heap contents in decoded pixels.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HEASARC cfitsio 0 ~ 4.7.0 -

II. Public POCs for CVE-2026-111124

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III. Intelligence Information for CVE-2026-111124

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Vendor Advisories for CVE-2026-111124 (1)

Vendor Pages for CVE-2026-111124 (1)

Other References for CVE-2026-111124 (2)

IV. Related Vulnerabilities

Same product: cfitsio
Same vendor: HEASARC
Same weakness: CWE-125

V. Comments for CVE-2026-111124

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