Description
The Perl_reg_numbered_buff_fetch function in Perl 5.10.0, 5.12.0, 5.14.0, and other versions, when running with debugging enabled, allows context-dependent attackers to cause a denial of service (assertion failure and application exit) via crafted input that is not properly handled when using certain regular expressions, as demonstrated by causing SpamAssassin and OCSInventory to crash.
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 | 5.20.1-1 | — |
| Debian 13 | perl | 5.20.1-1 | — |
| Debian 12 | perl | 5.20.1-1 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | perl | 5.24.0-3.5 | openSUSE-SU-2024:10449-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Perl 5.x - 'Perl_reg_numbered_buff_fetch()' Remote Denial of Service EDB-35489 · dos · Mar 23, 2011 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- openSUSE-SU-2024:10449-1 perl-32bit-5.24.0-3.5 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- SUSE-SR:2011:009 vendor-advisory
- [Postfixbuch-users] 20110222 proxy-reject: END-OF-MESSAGE: 451 4.3.0 Error: queue file write error mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=694166
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=628836
- http://forums.ocsinventory-ng.org/viewtopic.php?id=7215
- https://rt.perl.org/Public/Bug/Display.html?id=76538
- openSUSE-SU-2011:0479 vendor-advisory