CVE-2026-114501
published 2026-10-21CVE-2026-114501: Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image's rows are tightly contiguous and exports from…
PriorityP340medium6.3CVSS 4.0
AVNACLATPPRNUINVCLVINVANSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.47%
40.3th percentile
Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image's rows are tightly contiguous and exports from im->blocks[0].ptr even when PILLOW_ALIGNMENT makes aligned_linesize include row padding or an aligned offset before the first row. The resulting Arrow buffer can include uninitialized padding, bytes preceding the first row, or stale heap contents from previously freed images. Applications that configure alignment and export images to Arrow can therefore disclose one user's pixels or other process memory to another user. This issue is fixed in version 13.0.0.
Affected
85 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| ansible-automation-platform-25 | lightspeed-chatbot-rhel8 | — | — |
| ansible-automation-platform-26 | hub-rhel9 | — | — |
| ansible-automation-platform-26 | lightspeed-chatbot-rhel9 | — | — |
| ansible-automation-platform-27 | hub-rhel9 | — | — |
| ansible-automation-platform-27 | lightspeed-chatbot-rhel9 | — | — |
| ansible-automation-platform | automation-dashboard-rhel9 | — | — |
| exploit-intelligence | vulnerability-analysis-rhel9 | — | — |
| lightspeed-core | lightspeed-stack-rhel9 | — | — |
| lightspeed-core | rag-tool-cpu-rhel9 | — | — |
| lightspeed-core | rag-tool-cuda-12.9-rhel9 | — | — |
| lightspeed-services-ocp | ocp-rules-rhel9 | — | — |
| openshift-lightspeed-tech-preview | lightspeed-rag-tool-rhel9 | — | — |
| openshift-lightspeed | lightspeed-ocp-rag-rhel9 | — | — |
| openshift-lightspeed | lightspeed-service-api-rhel9 | — | — |
| python-pillow | pillow | — | — |
| python | pillow | >= 11.2.1 < 13.0.0 | 13.0.0 |
| quay | quay-rhel8 | — | — |
| quay | quay-rhel9 | — | — |
| rhai-early-access | docling-sdk-cuda-rhel9 | — | — |
| rhai-early-access | docling-serve-cuda-rhel9 | — | — |
| rhai | guidellm-rhel9 | — | — |
| rhaii | model-opt-cuda-rhel9 | — | — |
| rhaii | vllm-cpu-rhel9 | — | — |
| rhaii | vllm-cuda-rhel9 | — | — |
| rhaii | vllm-gaudi-rhel9 | — | — |
CVSS provenance
nvdv4.06.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/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
vendor_redhat6.3MEDIUM
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GHSA
Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1
ghsa·2026-10-23
CVE-2026-114501 [MEDIUM] CWE-226 Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1
Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1
### Summary
When [`PILLOW_ALIGNMENT`](https://pillow.readthedocs.io/en/stable/reference/block_allocator.html#memory-pools) is set above 1, exporting an image to Arrow returns uninitialized heap memory mixed in with the pixel data. That memory can include pixels from images the process freed earlier.
### Details
With an alignment above 1, the default allocator pads each row up to `aligned_linesize` and starts the first row at an aligned offset into the block. It then exports `im->blocks[0].ptr` as `xsize * ysize` tightly packed pixels, so exported data includes the padding bytes, and can include a few bytes from before the first row.
Tested vulnerable on 11.2.1, 12.3.0, 4c1ed27a5.
### PoC
Whether things leak may d
VulDB
python-pillow Pillow up to 12.x Arrow Export uninitialized pointer
vuldb·2026-10-22·CVSS 6.3
CVE-2026-114501 [MEDIUM] python-pillow Pillow up to 12.x Arrow Export uninitialized pointer
A vulnerability has been found in python-pillow Pillow up to 12.x and classified as problematic. This affects an unknown function of the component Arrow Export. The manipulation leads to uninitialized pointer.
This vulnerability is referenced as CVE-2026-114501. Remote exploitation of the attack is possible. No exploit is available.
The affected component should be upgraded.
Red Hat
pillow: Pillow: Information disclosure via improper memory alignment during Arrow export
vendor_redhat·2026-10-21·CVSS 6.3
CVE-2026-114501 [MEDIUM] CWE-908 pillow: Pillow: Information disclosure via improper memory alignment during Arrow export
pillow: Pillow: Information disclosure via improper memory alignment during Arrow export
Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image's rows are tightly contiguous and exports from im->blocks[0].ptr even when PILLOW_ALIGNMENT makes aligned_linesize include row padding or an aligned offset before the first row. The resulting Arrow buffer can include uninitialized padding, bytes preceding the first row, or stale heap contents from previously freed images. Applications that configure alignment and export images to Arrow can therefore disclose one user's pixels or other process memory to another user. This issue is fixed in version 13.0.0.
A flaw was found in Pillow. This vulnerability can lead to information disclosure when exporting image
No detection rules found.
No public exploits indexed.
2026-10-21
Published