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CVE-2026-70652— libvips: Possible heap-based buffer read overflow when resizing and re-encoding a JPEG with gain map

Quick assessment

Affected
libvips libvips
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.

libvips 是一款快速且内存需求较低的图片处理库。在 8.18.3 版本之前，当 libvips 使用 libultrahdr 支持构建时，在通过 VipsForeignSaveUhdr 编码增益图（gain map）的过程中，如果处理管线将输入的 JPEG 图像扩展至非常大的尺寸，libvips/foreign/uhdrsave.c 文件中的 vips_foreign_save_uhdr_set_raw_hdr 函数可能会错误地计算输出缓冲区的大小。这种缓冲区分配过小可能导致堆缓冲区越界读取，从而可能泄露相邻

CVSS 2.0 · Low EPSS 0.11% · P2

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
libvips libvips < 8.18.3 affected
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I. Basic Information for CVE-2026-70652

Vulnerability Information
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Vulnerability Title
libvips: Possible heap-based buffer read overflow when resizing and re-encoding a JPEG with gain map
Source: CVE Program / CVE List V5
Vulnerability Description
libvips is a fast image processing library with low memory needs. Prior to version 8.18.3, libvips built with libultrahdr support can incorrectly size an output buffer in libvips/foreign/uhdrsave.c within vips_foreign_save_uhdr_set_raw_hdr when a pipeline enlarges an incoming JPEG to a very large output before encoding a gain map through VipsForeignSaveUhdr. The undersized allocation can cause a heap buffer over-read that may disclose adjacent data or crash the process. This issue is fixed in version 8.18.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区上溢读取
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libvips libvips < 8.18.3 -

II. Public POCs for CVE-2026-70652

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-70652

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Patches & Fixes for CVE-2026-70652 (2)

Vendor Advisories for CVE-2026-70652 (1)

Vendor Pages for CVE-2026-70652 (1)

Same Patch Batch · libvips · 2026-08-20 · 5 CVEs total

CVE-2026-69242 8.4 HIGH libvips: Integer overflow leading to heap buffer overflow leading to possible attacker-con
CVE-2026-70651 6.9 MEDIUM libvips: Possible integer overflow when reading multi-page TIFF images via ImageMagick
CVE-2026-70654 5.8 MEDIUM libvips: A well-crafted PPM image processed via a custom source could lead to possible hea
CVE-2026-70653 4.8 MEDIUM libvips: Possible heap-based buffer read overflow when decoding a well-crafted RLE Radianc

IV. Related Vulnerabilities

Same product: libvips
Same vendor: libvips
Same weakness: CWE-126

V. Comments for CVE-2026-70652

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