When $CGI::PUTDATA_UPLOAD or an upload hook is set, read_postdata_putdata takes a request body that is not a form submission. With $CGI::DISABLE_UPLOADS set, it discards the body by reading until Content-Length bytes have arrived. Once a body shorter than its Content-Length runs out, every read returns 0, so the loop never ends.
A client can keep a server process spinning with one such request.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| unaffected |
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Vendor Solution
Upgrade to CGI 5.00 or later.
Tracking
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Wed, 04 Nov 2026 00:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | CGI versions before 5.00 for Perl allow an infinite loop on a short request body when $DISABLE_UPLOADS is set. When $CGI::PUTDATA_UPLOAD or an upload hook is set, read_postdata_putdata takes a request body that is not a form submission. With $CGI::DISABLE_UPLOADS set, it discards the body by reading until Content-Length bytes have arrived. Once a body shorter than its Content-Length runs out, every read returns 0, so the loop never ends. A client can keep a server process spinning with one such request. | |
| Title | CGI versions before 5.00 for Perl allow an infinite loop on a short request body when $DISABLE_UPLOADS is set | |
| Weaknesses | CWE-835 | |
| References |
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-11-03T23:41:17.179Z
Reserved: 2026-11-02T17:59:11.920Z
Link: CVE-2026-120651
Vulnrichment
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NVD
Status : Received
Published: 2026-11-04T00:17:26.633
Modified: 2026-11-04T00:17:26.633
Link: CVE-2026-120651
Redhat
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OpenCVE Enrichment
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CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')