Affects widely-used Perl interpreter; 32-bit regex compile can cause RCE, impacting many environments.
CVE-2026-8376
Heap overflow in 32-bit Perl regex compile
Is CVE-2026-8376 being exploited?
Not confirmed. CVE-2026-8376 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 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-8376?
CVE-2026-8376 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-2026-8376?
Yes. A fix has been recorded for CVE-2026-8376. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-8376 affect?
CVE-2026-8376 affects Perl <= 5.43.10 on 32-bit platforms. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-8376?
Upgrade to fixed Perl; use 64-bit builds if feasible
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE via attacker-controlled regex during 32-bit Perl compilation
Patch when possible