CVE-2026-8376 Memory corruption in perl:perl
Heap buffer overflow in Perl regex compilation on 32-bit builds allows attackers to execute code or cause denial of service via crafted regular expressions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-8376?
CVE-2026-8376 is a high-severity memory corruption vulnerability in perl:perl, published on 25 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 have a heap buffer overflow when compiling regular expressions with a repeated fixed string on 32-bit builds.
Perl_study_chunk in regcomp_study.c checked the size of the joined substring buffer in characters rather than bytes. For a quantified fixed substring with a large minimum count, the byte length mincount * l could overflow SSize_t, producing an undersized SvGROW allocation; the subsequent copy writes past the end of the buffer.
A caller that compiles an attacker-controlled regular expression on a 32-bit perl build triggers a heap buffer overflow at compile time.
Weakness: CWE-680
Which versions are affected by CVE-2026-8376?
It affects 1 product.
Products include Perl Perl.
How do I fix CVE-2026-8376?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-8376 being exploited?
There is no known exploitation of CVE-2026-8376 in the wild and no public exploit code.
Other vulnerabilities in perl:perl
Sources
Also known as AZL-87357, CLSA-2026-1780135768, CLSA-2026-1780136761, CLSA-2026-1780136870, CLSA-2026-1780391238, CLSA-2026-1780391418 and 22 more.