RUSTSEC-2026-0186
Unchecked pointer offset in crate `memmap2`
Affected versionf of memmap2 did not perform enough validation on the offset and len parameters of
Mmap::[unchecked_]advise_range(),
MmapMut::[unchecked_]advise_ranage()
and MmapMut::flush[_async]_range().
This can cause undefined behavior due to invalid values being passed to pointer::offset() and pointer::add()
when passing an out-of-bounds range to any of the affected functions.
The flaw was corrected in commit [cee7cf0] and released in version 0.9.11.
The invalid pointer is not dereferenced,
but it is passed to the madvise and msync syscalls and their Windows equivalents.
[cee7cf0] https://github.com/RazrFalcon/memmap2-rs/pull/170/changes/cee7cf03a9ee095982a3c37b7aac8e3f68f1a00c
What each source reports
OSV No score
Unchecked pointer offset in crate `memmap2`
Affected versionf of memmap2 did not perform enough validation on the offset and len parameters of
Mmap::[unchecked_]advise_range(),
MmapMut::[unchecked_]advise_ranage()
and MmapMut::flush[_async]_range().
This can cause undefined behavior due to invalid values being passed to pointer::offset() and pointer::add()
when passing an out-of-bounds range to any of the affected functions.
The flaw was corrected in commit [cee7cf0] and released in version 0.9.11.
The invalid pointer is not dereferenced,
but it is passed to the madvise and msync syscalls and their Windows equivalents.
[cee7cf0] https://github.com/RazrFalcon/memmap2-rs/pull/170/changes/cee7cf03a9ee095982a3c37b7aac8e3f68f1a00c
- Record
RUSTSEC-2026-0186- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
memmap2crates.io |
0.0.0-0 up to 0.9.11 | 0.9.11 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
RUSTSEC-2026-0186 is a vulnerability with no CVSS score yet in memmap2, published June 20, 2026. No source lists public exploit code. Fixed in memmap2 0.9.11.