PatchSiren cyber security CVE debrief
CVE-2022-4993 GSHANK CVE debrief
HTML::FormHandler versions through 0.40068 for Perl allow attacker-selected method dispatch and resource exhaustion due to improper handling of error message text as Locale::Maketext bracket notation templates. This vulnerability can be exploited by providing specially crafted input to the application, potentially leading to denial-of-service or code execution. The vulnerability is particularly concerning for applications that use untrusted field inputs or custom validators. Affected product deployments should be confirmed in managed environments and assigned an owner for follow-up. Official advisories or CVE records should be reviewed to validate affected scope, severity, and vendor guidance. Vendor-supported updates or mitigations should be planned through normal change control where exposure is confirmed. Compensating controls should be reviewed for exposed systems while remediation is scheduled and verified. Relevant monitoring, detection, and logs should be checked for exposed assets that need extra review. Exceptions should be tracked, remediated assets should be retested, and the item should only be closed after evidence is documented. Limited details are available on affected products and exploitation. Further review of the HTML::FormHandler codebase and testing of patched versions is recommended to ensure complete mitigation. Additionally, defenders should verify the implementation of input validation and sanitization in their applications, as well as review custom validators and type constraints for potential vulnerabilities.
- Vendor
- GSHANK
- Product
- HTML::FormHandler
- CVSS
- CRITICAL 9.1
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-08-13
- Original CVE updated
- 2026-09-08
- Advisory published
- 2026-08-13
- Advisory updated
- 2026-09-08
Who should care
Developers and administrators using HTML::FormHandler in Perl applications, especially those with untrusted field inputs or custom validators, should be aware of this vulnerability and take steps to mitigate it. Additionally, security teams and vulnerability management professionals should review the affected code and ensure that proper mitigations are in place.
Technical summary
HTML::FormHandler versions through 0.40068 for Perl allow attacker-selected method dispatch and resource exhaustion due to improper handling of error message text as Locale::Maketext bracket notation templates. This vulnerability can be exploited by providing specially crafted input to the application, potentially leading to denial-of-service or code execution. The vulnerability is particularly concerning for applications that use untrusted field inputs or custom validators.
Defensive priority
High priority for applications using HTML::FormHandler versions through 0.40068, especially those with untrusted field inputs or custom validators.
Recommended defensive actions
- Apply patches or updates to HTML::FormHandler to prevent method dispatch and resource exhaustion vulnerabilities
- Validate and sanitize all user input to prevent exploitation
- Implement compensating controls, such as Web Application Firewalls (WAFs), to detect and prevent attacks
- Monitor and track potential exploitation attempts
- Review and update custom validators and type constraints to prevent similar vulnerabilities
- Conduct a thorough review of the application code to identify potential vulnerabilities
- Perform regular security audits and penetration testing to detect and address potential issues
Evidence notes
Evidence is based on official CVE and NVD records, as well as source references from Metacpan and GitHub. Limited details are available on affected products and exploitation. Further review of the HTML::FormHandler codebase and testing of patched versions is recommended to ensure complete mitigation. Additionally, defenders should verify the implementation of input validation and sanitization in their applications, as well as review custom validators and type constraints for potential vulnerabilities.
Sources and references
Verified primary and authoritative sources
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CVE-2022-4993 CVE Program record
Publisher, destination, and source semantics verified
URL: https://www.cve.org/CVERecord?id=CVE-2022-4993
CVE Program - Official CVE Program record with source-provided CVE metadata.
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CVE-2022-4993 NVD vulnerability detail
Publisher, destination, and source semantics verified
URL: https://nvd.nist.gov/vuln/detail/CVE-2022-4993
NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.
Supplemental references
-
Source reference
Unverified legacy reference
URL: https://github.com/gshank/html-formhandler/pull/159
9b29abf9-4ab0-4765-b253-1875cd9b441e
-
Source reference
Unverified legacy reference
URL: https://metacpan.org/release/GSHANK/HTML-FormHandler-0.40068/source/lib/HTML/FormHandler/Field.pm
9b29abf9-4ab0-4765-b253-1875cd9b441e
-
Source reference
Unverified legacy reference
URL: https://metacpan.org/release/GSHANK/HTML-FormHandler-0.40068/source/lib/HTML/FormHandler/I18N/en_us.pm
9b29abf9-4ab0-4765-b253-1875cd9b441e
-
Source reference
Unverified legacy reference
URL: https://metacpan.org/release/GSHANK/HTML-FormHandler-0.40068/source/lib/HTML/FormHandler/Validate.pm
9b29abf9-4ab0-4765-b253-1875cd9b441e
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Source reference
Unverified legacy reference
URL: https://security.metacpan.org/patches/H/HTML-FormHandler/0.40068/CVE-2022-4993-r2.patch
9b29abf9-4ab0-4765-b253-1875cd9b441e
-
Source reference
Unverified legacy reference
URL: https://www.cve.org/CVERecord?id=CVE-2012-6329
9b29abf9-4ab0-4765-b253-1875cd9b441e
Methodology and review provenance
AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.