CVE-2026-57432
Perl pack/unpack integer overflow allows heap out-of-bounds read and data disclosure.
Is CVE-2026-57432 being exploited?
Not confirmed. CVE-2026-57432 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 0.21% probability of exploitation in the next 30 days.
How severe is CVE-2026-57432?
CVE-2026-57432 is rated High with a CVSS score of 8.4. 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-2026-57432?
Yes. A fix has been recorded for CVE-2026-57432. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-57432 affect?
CVE-2026-57432 affects Perl <= 5.43.10, Applications using Perl pack/unpack with untrusted templates. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57432?
Upgrade Perl to a patched release and sanitize/avoid untrusted pack/unpack templates.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted pack/unpack templates cause signed integer wrap and out-of-bounds heap reads, allowing memory disclosure to attacker-supplied callers.
Patch when possible