vulnerability / NVI-00010624 / Revision 1
Pillow: Bundled libopenjp2 2.5.4 in all wheels since 11.1.0 carries OSV-2025-219 heap-buffer-overflow write reachable from Image.open().load()
GitHub lists this reviewed advisory for pillow. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
8.1 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
pillow
source listed>= 11.1.0, < 13.0.0
### Summary Every Pillow wheel from 11.1.0 onward bundles a libopenjp2 containing a heap-buffer-overflow **write** that is fixed upstream on master but has never appeared in an OpenJPEG release. See https://osv.dev/vulnerability/OSV-2025-219 Because the wheel bundles its own copy, a patched host OS does not help. It is reachable from `Image.open(fp); im.load()` with default settings. I am reporting it here rather than only upstream because Pillow is where the vulnerable binary actually reaches users. Note the inversion that makes this easy to miss: **OpenJPEG 2.5.2 and earlier are safe.** The bug was introduced in `954c6e3c` (2024-06-25), so keeping the dependency current is what creates the exposure. ### Details ## Affected wheels From `.github/dependencies.json` (`openjpeg`) at each tag: | Pillow | bundled OpenJPEG | status | |---|---|---| | 10.4.0 | 2.5.2 | safe | | 11.0.0 | 2.5.2 | safe | | **11.1.0, 11.2.1, 11.3.0** | **2.5.3** | **affected** | | **12.0.0 … 12.3.0** | **2.5.4** | **affected** | Confirmed on an installed wheel: `PIL.features.version_codec('jpg_2000')` → `2.5.4`, bundled file `pillow.libs/libopenjp2-*.so.2.5.4`. `main` still pins `2.5.4` as of 2026-10-0
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-78g4-xqwv-q3g8 ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.