Description
CGI versions before 5.00 for Perl allow memory, CPU and disk exhaustion via missing or unenforced request size, parameter and upload limits.
$CGI::POST_MAX defaults to no limit, and when set is not enforced for chunked multipart bodies or for the boundary line of a multipart body without a boundary= parameter. Bodies saved as PUTDATA, POSTDATA or PATCHDATA uploads are read into memory in one go, and nothing limits the number of parameters or uploads.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | CGI | < 5.00 | 5.00 |
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 | libcgi-pm-perl | No fix yet | — |
| Debian 13 | libcgi-pm-perl | No fix yet | — |
| Debian 12 | libcgi-pm-perl | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libcgi-pm-perl | No fix yet | — |
| Ubuntu 26.04 LTS | libcgi-pm-perl | No fix yet | — |
| Ubuntu 24.04 LTS | libcgi-pm-perl | No fix yet | — |
| Ubuntu 22.04 LTS | libcgi-pm-perl | No fix yet | — |
| Ubuntu 20.04 LTS | libcgi-pm-perl | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libcgi-pm-perl | No fix yet | — |
| Ubuntu 16.04 LTS | libcgi-pm-perl | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | perl-CGI | 4.61-5.el10_3.1 | RHSA-2026:99212 |
| RHEL 9 | perl-CGI | 4.51-5.el9_9.1 | RHSA-2026:99215 |
| RHEL 8 | perl-CGI | 4.38-3.el8_10 | RHSA-2026:99849 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.2 EUS | perl-CGI | 4.61-5.el10_2.1 | RHSA-2026:99214 |
| RHEL 9.8 EUS | perl-CGI | 4.51-5.el9_8.1 | RHSA-2026:99213 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | perl-CGI | 4.38-3.el8_10 | ALSA-2026:99849 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | perl-CGI | 4.61-5.el10_3.1 | RLSA-2026:99212 |
| Rocky Linux 9 | perl-CGI | 4.51-5.el9_9.1 | RLSA-2026:99215 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | perl-CGI | 5.20.0-1.1 | openSUSE-SU-2026:12465-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | perl-CGI +1 | 5.02-1.amzn2023.0.1 | ALAS2023-2026-3436 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | perl-CGI | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perl-CGI | 4.38-3.el8_10 | ELSA-2026-99849 |
Advisories 12
- RHSA-2026:99212 Red Hat Security Advisory: perl-CGI security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99215 Red Hat Security Advisory: perl-CGI security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99214 Red Hat Security Advisory: perl-CGI security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99213 Red Hat Security Advisory: perl-CGI security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99849 Red Hat Security Advisory: perl-CGI security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RLSA-2026:99215 Important: perl-CGI security update Rocky Linux Security Advisories · Nov 13, 2026
- RLSA-2026:99212 Important: perl-CGI security update Rocky Linux Security Advisories · Nov 13, 2026
- ALSA-2026:99849 Important: perl-CGI security update AlmaLinux Security Advisories · Nov 13, 2026
- ELSA-2026-99849 Important: perl-CGI security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 13, 2026
- WID-SEC-2026-4542 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- ALAS2023-2026-3436 Important: perl-CGI security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 12, 2026
- openSUSE-SU-2026:12465-1 perl-CGI-5.20.0-1.1 on GA media SUSE / openSUSE Security Updates · Nov 7, 2026
References
- https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm technical-description
- https://metacpan.org/release/LEEJO/CGI-5.00/changes release-notes
- https://github.com/leejo/CGI.pm/commit/17b838dc14d2b82ae6c7e76f66ec2c3f3b08038b.patch patch
- https://github.com/leejo/CGI.pm/commit/f3febefe63fe3881d8c3ae10fa83ca8ec950b959.patch patch
- https://github.com/leejo/CGI.pm/commit/277baeb74fde7bce975a7bd0a1f98dcf1b9b2050.patch patch
- https://github.com/leejo/CGI.pm/commit/8940a74e53a41563f72813b45f99cceaaa4c92e8.patch patch