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CVE-2026-111125— CFITSIO through 4.7.0 Heap Out-of-Bounds Read via HCOMPRESS input_nnybble

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 4.7.0 及之前版本中存在一个基于堆的越界读取漏洞，该漏洞位于 HCOMPRESS 瓦片解码器中。攻击者可以通过 fits_hdecompress.c 中的 input_nnybble 参数，读取超出压缩瓦片缓冲区范围的数据。攻击者可以构造一个特殊的 FITS 文件，其中声明的 ZCMPTYPE 为 HCOMPRESS_1，并设定过大的瓦片几何尺寸，从而导致调用 fits_read_pix 的应用程序崩溃，或泄露部分堆内存信息。

CVSS 6.1 · Medium EPSS 0.13% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
HEASARC cfitsio ≤ 4.7.0 affected
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I. Basic Information for CVE-2026-111125

Vulnerability Information
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Vulnerability Title
CFITSIO through 4.7.0 Heap Out-of-Bounds Read via HCOMPRESS input_nnybble
Source: CVE Program / CVE List V5
Vulnerability Description
CFITSIO through 4.7.0 contains a heap-based out-of-bounds read vulnerability in the HCOMPRESS tile decoder that allows attackers to read past the compressed tile buffer via input_nnybble in fits_hdecompress.c. Attackers can supply a crafted FITS file with ZCMPTYPE HCOMPRESS_1 declaring oversized tile geometry to crash applications calling fits_read_pix or disclose limited heap memory.
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-2026-111125

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III. Intelligence Information for CVE-2026-111125

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Vendor Advisories for CVE-2026-111125 (1)

Vendor Pages for CVE-2026-111125 (1)

Other References for CVE-2026-111125 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-111125

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