EUVD-2026-63652Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Local vector and high complexity reflect the opt-in libultrahdr build requirement and crafted-input trigger; PR:L matches the authenticated local/application user needed to submit images.
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Heap buffer over-read in libvips prior to 8.18.3 allows disclosure of adjacent heap memory or process crash when processing JPEG images through the UltraHDR save pipeline. The flaw in vips_foreign_save_uhdr_set_raw_hdr stems from using raw pixel dimension arithmetic instead of the library's safe VIPS_IMAGE_N_PELS macro to size an output buffer, producing an undersized allocation when a pipeline enlarges an incoming JPEG before gain-map encoding. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Four specific conditions must all be met: (1) libvips must be compiled with libultrahdr support, which is a non-default, opt-in build configuration; (2) the application pipeline must specifically invoke the `VipsForeignSaveUhdr` save class and route through the gain-map encoding path in `vips_foreign_save_uhdr_set_raw_hdr`; (3) the input JPEG must be crafted or structured such that the pipeline enlarges it to a very large output before uhdr encoding - normal-sized inputs do not trigger the condition; (4) the attacker must have local or application-level access to submit image inputs to the processing pipeline (CVSS PR:L, AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 2.0 is internally consistent with the described behavior and accurately reflects the constrained real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to libvips 8.18.3 or later, available at https://github.com/libvips/libvips/releases/tag/v8.18.3. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-126 – Buffer Over-read
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today