# 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.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Jul 2026
- **Updated:** 22 Jul 2026
- **Also known as:** GHSA-wwq3-v3pc-8w9p

## 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 (Out-of-bounds Read)

## 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-59145 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-59145 in the wild and no public exploit code.

Affected product: EGOR Data::Intern::Shared. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-59145/ (Markdown: https://insights.sbomify.com/CVE-2026-59145/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-59145
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-59145
- OSV: https://osv.dev/vulnerability/CVE-2026-59145

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-59145/
Summaries are generated and may contain mistakes; the official description above is the record.