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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | perl | < 5.40.5-RC1, 5.41.0 – < 5.42.3-RC1, 5.43.0 – < 5.43.11 | 5.40.5-RC1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | perl | 5.40.1-8 | — |
| Debian 13 | perl | 5.40.1-6+deb13u1 | — |
| Debian 12 | perl | 5.36.0-7+deb12u4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | perl | 5.40.1-7ubuntu0.1 | — |
| Ubuntu 25.10 | perl | 5.40.1-6ubuntu0.1 | USN-8467-2 |
| Ubuntu 24.04 LTS | perl | 5.38.2-3.2ubuntu0.3 | — |
| Ubuntu 22.04 LTS | perl | 5.34.0-3ubuntu1.7 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | perl | 5.30.0-9ubuntu0.5+esm2 | USN-8467-1 |
| Ubuntu Pro 18.04 LTS | perl | 5.26.1-6ubuntu0.7+esm2 | USN-8467-1 |
| Ubuntu Pro 16.04 LTS | perl | 5.22.1-9ubuntu0.9+esm2 | USN-8467-1 |
| Ubuntu Pro 14.04 LTS | perl | 5.18.2-2ubuntu1.7+esm7 | USN-8467-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLES 15 SP6 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLES 15 SP5 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLES 15 SP4 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLES 12 SP5 | perl | 5.18.2-12.35.1 | SUSE-SU-2026:3540-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | perl | 5.42.0-160000.3.1 | SUSE-SU-2026:22847-1 |
| SLES for SAP 15 SP6 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLES for SAP 15 SP5 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLES for SAP 15 SP4 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLES 16.0 | perl | 5.42.0-160000.3.1 | SUSE-SU-2026:22847-1 |
| SLE Micro 6.2 | perl | 5.42.0-160000.3.1 | SUSE-SU-2026:22929-1 |
| SLE Micro 6.1 | perl | 5.38.2-slfo.1.1_3.1 | SUSE-SU-2026:23075-1 |
| SLE Micro 6.0 | perl | 5.38.2-5.1 | SUSE-SU-2026:23008-1 |
| SLE Micro 5.5 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLE Micro 5.4 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLE Micro 5.3 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLE HPC 15 SP5 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
| SLE HPC 15 SP4 | perl | 5.26.1-150300.17.23.1 | SUSE-SU-2026:3558-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | perl | 5.42.0-160000.3.1 | openSUSE-SU-2026:21411-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | perl | 5.42.3-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | perl +6 | 4:5.32.1-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Attribute-Handlers | 1.01-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-AutoSplit +1 | 5.74-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-B | 1.80-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Class-Struct | 0.66-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-DBM_Filter | 0.06-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Devel-Peek | 1.28-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-DynaLoader | 1.47-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-English +1 | 1.11-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Errno | 1.30-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-ExtUtils-Constant | 0.25-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-ExtUtils-Embed | 1.35-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Fcntl +1 | 1.13-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-File-Basename | 2.85-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-File-Compare | 1.100.600-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-File-Copy | 2.34-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-File-Find +1 | 1.37-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-FileCache | 1.10-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-FileHandle | 2.03-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-FindBin | 1.51-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-GDBM_File | 1.18-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Hash-Util | 0.23-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Hash-Util-FieldHash | 1.20-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-I18N-LangTags | 0.44-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-I18N-Langinfo | 0.19-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-IO | 1.43-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-IPC-Open3 | 1.21-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Locale-Maketext-Simple | 1:0.21-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Math-Complex | 1.59-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Module-Loaded | 1:0.08-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-NDBM_File | 1.15-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-NEXT | 0.67-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Net +3 | 1.02-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-ODBM_File | 1.16-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Opcode | 1.48-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-POSIX | 1.94-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Pod-Html | 1.25-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Safe | 2.41-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-SelfLoader | 1.26-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Symbol | 1.08-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Term-Complete | 1.403-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Term-ReadLine | 1.17-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Test +1 | 1.31-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Thread | 3.05-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Thread-Semaphore | 2.13-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Tie | 4.6-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Tie-File +1 | 1.06-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Tie-Memoize | 1.1-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Time +4 | 1.03-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Time-Piece | 1.3401-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-Unicode-UCD | 0.75-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-base +2 | 2.27-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-blib +1 | 1.07-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-debugger | 1.56-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-deprecate | 0.04-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-encoding-warnings | 0.13-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-if | 0.60.800-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-less +1 | 0.03-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-lib | 0.65-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-locale +3 | 1.09-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-mro +2 | 1.23-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-open +2 | 1.12-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-overloading | 0.02-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-ph +3 | 5.32.1-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-sort | 2.04-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-vars +1 | 1.05-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2023 | perl-vmsish | 1.04-477.amzn2023.0.9 | ALAS2023-2026-1819 |
| Amazon Linux 2 | perl +4 | 4:5.16.3-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-CPAN | 1.9800-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-ExtUtils-CBuilder | 1:0.28.2.6-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-ExtUtils-Embed | 1.30-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-ExtUtils-Install | 1.58-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-IO-Zlib | 1:1.10-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-Locale-Maketext-Simple | 1:0.21-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-Module-CoreList | 1:2.76.02-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-Module-Loaded | 1:0.08-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-Object-Accessor | 1:0.42-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-Package-Constants | 1:0.02-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-Pod-Escapes | 1:1.04-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-Time-Piece | 1.20.1-299.amzn2.0.4 | ALAS2-2026-3352 |
| Amazon Linux 2 | perl-core | 5.16.3-299.amzn2.0.4 | ALAS2-2026-3352 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | perl | 5.38.2-512 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | perl +4 | 5.42.2-r3 | — |
Advisories 13
- SSA-457936 SSA-457936: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.7 Siemens ProductCERT · Nov 10, 2026
- WID-SEC-2026-1663 Perl: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Oct 4, 2026
- SUSE-SU-2026:23075-1 Security update for perl SUSE / openSUSE Security Updates · Aug 14, 2026
- SUSE-SU-2026:23008-1 Security update for perl SUSE / openSUSE Security Updates · Aug 12, 2026
- SUSE-SU-2026:3558-1 Security update for perl SUSE / openSUSE Security Updates · Aug 12, 2026
- SUSE-SU-2026:3540-1 Security update for perl SUSE / openSUSE Security Updates · Aug 11, 2026
- SUSE-SU-2026:22929-1 Security update for perl SUSE / openSUSE Security Updates · Jul 29, 2026
- SUSE-SU-2026:22847-1 Security update for perl SUSE / openSUSE Security Updates · Jul 28, 2026
- openSUSE-SU-2026:21411-1 Security update for perl SUSE / openSUSE Security Updates · Jul 24, 2026
- USN-8467-1 perl vulnerabilities Ubuntu Security Notices (USN) · Jul 13, 2026
- USN-8467-2 perl vulnerabilities Ubuntu Security Notices (USN) · Jul 2, 2026
- ALAS2-2026-3352 Moderate: perl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 8, 2026
- ALAS2023-2026-1819 Moderate: perl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 8, 2026