CVE-2022-40899 — An issue discovered in Python Charmers Future 0

An issue discovered in Python Charmers Future 0.18.2 and earlier allows remote attackers to cause a denial of service via crafted Set-Cookie header from malicious web server.

01What is this vulnerability?

An issue discovered in Python Charmers Future 0.18.2 and earlier allows remote attackers to cause a denial of service via crafted Set-Cookie header from malicious web server.

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: 2022-12-22T00:00:00.000Z
• Last modified: 2025-04-15T15:52:06.467Z

09References

• pypi.org — https://pypi.org/project/future/
• github.com — https://github.com/PythonCharmers/python-future/blob/master/src/future/backports…
• github.com — https://github.com/python/cpython/pull/17157
• pyup.io — https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-package…
• github.com — https://github.com/PythonCharmers/python-future/pull/610