libhtml-formhandler-perl — security advisory
HTML::FormHandler versions before 0.410000 for Perl allow attacker selected method dispatch and resource exhaustion because _apply_actions and add_error use error message text built from request data as a Locale::Maketext bracket notation template. add_error hands its first argument to the language handle as the Locale::Maketext message key, and the default handle's lexicon sets `_AUTO`, so a string that is not a lexicon entry is compiled as a bracket notation template instead of being looked up. In a bracket group the first token names a method called on the language handle and the remaining tokens are its arguments. Three kinds of text the library did not author reach that position. _apply_actions installs a `$SIG{__WARN__}` handler that stores the warning text in `$error_message`, and a captured warning survives a successful action, so a field carrying a numeric transform turns `Argument "[sprintf,%50000000d,0]" isn't numeric` into the template; a warning quotes the submitted value verbatim, so the group is well formed and dispatches. `$error_message ||= $tobj->validate($new_value)` takes a type constraint's own failure message, which renders the rejected value through a partial dumper in bracket and comma form (Devel::PartialDump when Moose can load it, Type::Tiny's own dumper always), so a field with `apply => [ Str ]` given a parameter sent more than once, which arrives as an array, gets `Reference ["a","b"] did not pass type constraint "Str"` as its template, from a re
- Products
- libhtml-formhandler-perl
- Affected versions
- 0.40057-1, 0.40064-1, 0.40067-1, 0.40068-1, 0.40068-2, 0.40068-3
- Fixed versions
- Not specified
- CVEs
- CVE-2022-4993
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:48 UTC · Revision 1
Source evidence
HTML::FormHandler versions before 0.410000 for Perl allow attacker selected method dispatch and resource exhaustion because _apply_actions and add_error use error message text built from request data as a Locale::Maketext bracket notation template. add_error hands its first argument to the language handle as the Locale::Maketext message key, and the default handle's lexicon sets `_AUTO`, so a string that is not a lexicon entry is compiled as a bracket notation template instead of being looked up. In a bracket group the first token names a method called on the language handle and the remaining tokens are its arguments. Three kinds of text the library did not author reach that position. _apply_actions installs a `$SIG{__WARN__}` handler that stores the warning text in `$error_message`, and a captured warning survives a successful action, so a field carrying a numeric transform turns `Argument "[sprintf,%50000000d,0]" isn't numeric` into the template; a warning quotes the submitted value verbatim, so the group is well formed and dispatches. `$error_message ||= $tobj->validate($new_value)` takes a type constraint's own failure message, which renders the rejected value through a partial dumper in bracket and comma form (Devel::PartialDump when Moose can load it, Type::Tiny's own dumper always), so a field with `apply => [ Str ]` given a parameter sent more than once, which arrives as an array, gets `Reference ["a","b"] did not pass type constraint "Str"` as its template, from a re
osv:UBUNTU-CVE-2022-4993
libhtml-formhandler-perl
Fixed versions: Not specified
libhtml-formhandler-perl
Fixed versions: Not specified
libhtml-formhandler-perl
Fixed versions: Not specified
libhtml-formhandler-perl
Fixed versions: Not specified
libhtml-formhandler-perl
Fixed versions: Not specified
libhtml-formhandler-perl
Fixed versions: Not specified
libhtml-formhandler-perl
Fixed versions: Not specified
Complete source record
{
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"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2022-4993",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2022-4993",
"summary": "HTML::FormHandler versions before 0.410000 for Perl allow attacker selected method dispatch and resource exhaustion because _apply_actions and add_error use error message text built from request data as a Locale::Maketext bracket notation template. add_error hands its first argument to the language handle as the Locale::Maketext message key, and the default handle's lexicon sets `_AUTO`, so a string that is not a lexicon entry is compiled as a bracket notation template instead of being looked up. In a bracket group the first token names a method called on the language handle and the remaining tokens are its arguments. Three kinds of text the library did not author reach that position. _apply_actions installs a `$SIG{__WARN__}` handler that stores the warning text in `$error_message`, and a captured warning survives a successful action, so a field carrying a numeric transform turns `Argument \"[sprintf,%50000000d,0]\" isn't numeric` into the template; a warning quotes the submitted value verbatim, so the group is well formed and dispatches. `$error_message ||= $tobj->validate($new_value)` takes a type constraint's own failure message, which renders the rejected value through a partial dumper in bracket and comma form (Devel::PartialDump when Moose can load it, Type::Tiny's own dumper always), so a field with `apply => [ Str ]` given a parameter sent more than once, which arrives as an array, gets `Reference [\"a\",\"b\"] did not pass type constraint \"Str\"` as its template, from a re",
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"aliases": [
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"modified": "2026-10-17T12:56:03.898579952Z",
"provider": "osv",
"upstream": [
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"references": [
"https://ubuntu.com/security/CVE-2022-4993",
"https://www.cve.org/CVERecord?id=CVE-2022-4993",
"https://lists.security.metacpan.org/cve-announce/msg/42659947/",
"https://security.metacpan.org/patches/H/HTML-FormHandler/0.40068/CVE-2022-4993-r2.patch"
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"source_id": "core-osv",
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"published_at": "2026-08-13T17:17:00+00:00"
}