CVE-2026-57433
Signed integer overflow in Perl Storable deserialization can crash processes (DoS).
Is CVE-2026-57433 being exploited?
Not confirmed. CVE-2026-57433 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-57433?
CVE-2026-57433 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-57433?
Yes. A fix has been recorded for CVE-2026-57433. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-57433 affect?
CVE-2026-57433 affects Perl Storable < 3.41, Perl applications using Storable (thaw/retrieve), Systems deserializing untrusted Storable data. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57433?
Upgrade Storable to >=3.41 and avoid deserializing untrusted data.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted SX_HOOK blob during thaw/retrieve triggers signed overflow, causing av_extend panic and process crash (remote DoS).
Patch when possible
- affected< 3.41
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.