CVE-2022-40468 — Potential leak of left-over heap data if custom error page templates containing

Potential leak of left-over heap data if custom error page templates containing special non-standard variables are used. Tinyproxy commit 84f203f and earlier use uninitialized buffers in process_request() function.

01What is this vulnerability?

Potential leak of left-over heap data if custom error page templates containing special non-standard variables are used. Tinyproxy commit 84f203f and earlier use uninitialized buffers in process_request() function.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

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

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-09-19T00:00:00.000Z
• Last modified: 2025-11-04T16:09:53.843Z

09References

• github.com — https://github.com/tinyproxy/tinyproxy
• github.com — https://github.com/tinyproxy/tinyproxy/blob/84f203fb1c4733608c7283bbe794005a469c…
• github.com — https://github.com/tinyproxy/tinyproxy/issues/457
• github.com — https://github.com/tinyproxy/tinyproxy/issues/457#issuecomment-1264176815
• security.gentoo.org — https://security.gentoo.org/glsa/202305-27