Crash or disclosure via undersized gain-map buffer
Published Aug 20, 2026 · Updated Aug 20, 2026
Buffer over-read in libvips before 8.18.3 allows local users to read adjacent memory or crash the process via crafted JPEG gain-map encoding. In libvips/foreign/uhdrsave.c, vips_foreign_save_uhdr_set_raw_hdr sized the HDR output plane as image->Xsize * image->Ysize * 8 instead of 8 * VIPS_IMAGE_N_PELS(image), so a resized image could leave the heap buffer smaller than the pixel count later consumed. Reachability is limited to builds with libultrahdr support and to pipelines that first enlarge an incoming JPEG to a very large output before VipsForeignSaveUhdr encodes the gain map, bounding impact to adjacent-memory disclosure or a process crash.
Summary
What happened
Buffer over-read in libvips before 8.18.3 allows local users to read adjacent memory or crash the process via crafted JPEG gain-map encoding. In libvips/foreign/uhdrsave.c, vips_foreign_save_uhdr_set_raw_hdr sized the HDR output plane as image->Xsize * image->Ysize * 8 instead of 8 * VIPS_IMAGE_N_PELS(image), so a resized image could leave the heap buffer smaller than the pixel count later consumed. Reachability is limited to builds with libultrahdr support and to pipelines that first enlarge an incoming JPEG to a very large output before VipsForeignSaveUhdr encodes the gain map, bounding impact to adjacent-memory disclosure or a process crash.
The record
- CVE
- CVE-2026-70652
- Published
- Aug 20, 2026
- Updated
- Aug 20, 2026
- Vendor
- libvips
- Product
- libvips
- Classifications
- CWE-126
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 20, 2026CVE publishedPublication date reported by the CVE source.
- Aug 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=< 8.18.3
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What is affected?
Published CVSS scores
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