CVE-2026-59145 Information disclosure in Data::Intern::Shared
A local attacker with file write access can trigger an out-of-bounds read in Data::Intern::Shared, potentially disclosing adjacent process memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-59145?
CVE-2026-59145 is a critical vulnerability in EGOR Data::Intern::Shared, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Data::Intern::Shared versions before 0.02 for Perl allow an out-of-bounds read via unvalidated slot, reverse and arena indices in si_idx_find.
The attach-time validator si_validate_header is thorough about the header and layout (magic, version, section offsets, total_size, count and arena_used) but does not validate the three arrays it then trusts. Every lookup in si_idx_find walks a triple indirection read straight from the mmap'd segment, arena[reverse[slots[i].id]], with no bound on slots[i].id against count, on the reverse[id] arena offset against arena_used, or on the arena record's length prefix.
A local peer that can write the backing file can leave the header valid while poisoning a slot id, a reverse offset or an arena length prefix, so an id_of, intern or string lookup dereferences the chain out of bounds; because string() returns a file-controlled length of bytes from the arena, adjacent process memory can be disclosed.
Weakness: CWE-125
Which versions are affected by CVE-2026-59145?
How do I fix CVE-2026-59145?
No fix has been published for CVE-2026-59145 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-59145 being exploited?
There is no known exploitation of CVE-2026-59145 in the wild and no public exploit code.
Sources
Also known as GHSA-wwq3-v3pc-8w9p.