CVE-2022-4993 — HTML::FormHandler versions before 0

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.

01What is this vulnerability?

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.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2026-08-13T17:17:17.780
• Last modified: 2026-09-08T20:17:24.160

09References

• github.com — https://github.com/gshank/html-formhandler/commit/8a204d0e64d8b30f37b19604af9b97…
• github.com — https://github.com/gshank/html-formhandler/pull/159
• metacpan.org — https://metacpan.org/release/ABRAXXA/HTML-FormHandler-0.410001/changes
• metacpan.org — https://metacpan.org/release/GSHANK/HTML-FormHandler-0.40068/source/lib/HTML/For…
• metacpan.org — https://metacpan.org/release/GSHANK/HTML-FormHandler-0.40068/source/lib/HTML/For…
• metacpan.org — https://metacpan.org/release/GSHANK/HTML-FormHandler-0.40068/source/lib/HTML/For…
• www.cve.org — https://www.cve.org/CVERecord?id=CVE-2012-6329