CVE-2026-57433: Storable versions before 3.41 for Perl have a signed integer overflow when deserializing a crafted SX_HOOK rec

Q: How do I fix CVE-2026-57433?

storable: upgrade to 3.41. Exact commands for each OS are on this page.

Q: Is CVE-2026-57433 being exploited?

CVE-2026-57433 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57433 affect?

CVE-2026-57433 affects storable. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2026-57433?

Priority 46/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-57433 is a critical-severity flaw (CVSS 9.8) affecting storable. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 deseriali

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 72%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-07-13
Last modified	2026-10-24

Publisher (CNA): CPANSec · Vendor: nwclark

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-13 17:17 UTCPublished CVE record published
2026-10-24 22:10 UTCUpdated Record last modified

nwclark storable UPGRADE

Affected: < 3.41

Fixed in: 3.41

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy storable || rpm -q storable || storable --version

2. UPGRADE to 3.41 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade storable

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade storable

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Official advisories

Amazon Linux 2023 ALAS: ALAS2023-2026-3203 (medium): perl-Storable 2026-10-12
Amazon Linux 2 ALAS: ALAS2-2026-3989 (medium): perl-Storable 2026-10-12

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57433?

storable: upgrade to 3.41. Exact commands for each OS are on this page.

Is CVE-2026-57433 being exploited?

CVE-2026-57433 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57433 affect?

CVE-2026-57433 affects storable. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2026-57433?

Priority 46/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

References

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