CVE-2026-57433 in Storable for Perl
Storable versions before 3.41 for Perl have a signed integer overflow when deserializing a crafted SX_HOOK record. retrieve_hook_common reads a signed 32-bit item count from an SX_HOOK record and calls av_extend with that count plus one. A count of I32_MAX wraps the addition to a negative value. A crafted blob passed to thaw or retrieve triggers the overflow; av_extend receives the negative count and dies with a panic, terminating the deserialization.
Quick answer
Storable for Perl should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Storable for Perl before 3.41
Fixed versions
- Storable 3.41 or later
How to fix it
CVE-2026-57433 affects Storable for Perl. In simple terms, an attacker may be able to misuse the affected system if it is exposed or if a user opens unsafe input. Update to Storable 3.41 or later. If you cannot update right away, limit access until the fix is installed.
- Find every place where Storable for Perl is installed or used.
- Check the installed version against the affected versions on this page.
- Update to Storable 3.41 or later.
- If an update is not possible today, turn off the risky feature or restrict it to trusted users only.
- Review recent logs for strange access, failed logins, changed files, or unexpected admin actions.
- Rotate passwords, API keys, and tokens if you think the system may have been abused.
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Verify the fix
- Confirm Storable for Perl now runs a fixed version or has the vendor mitigation in place.
- Test the affected feature again and make sure normal users can still work.
- Check that public or untrusted access is blocked where it should be blocked.
- Review logs again after the fix and confirm the same suspicious activity does not continue.
- Run a new Fixnx scan or your normal security check and save the result.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-57433?
Storable for Perl versions listed as affected should be reviewed: Storable for Perl before 3.41.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.