CVE-2017-8891 — Dropbox Lepton 1

Dropbox Lepton 1.2.1 allows DoS (SEGV and application crash) via a malformed lepton file because the code does not ensure setup of a correct number of threads.

01What is this vulnerability?

Dropbox Lepton 1.2.1 allows DoS (SEGV and application crash) via a malformed lepton file because the code does not ensure setup of a correct number of threads.

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

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: 2017-05-10T16:29:00.227
• Last modified: 2026-05-13T00:24:29.033

09References

• openwall.com — http://openwall.com/lists/oss-security/2017/05/10/1
• github.com — https://github.com/dropbox/lepton/commit/82167c144a322cc956da45407f6dce8d4303d34…
• github.com — https://github.com/dropbox/lepton/issues/87
• openwall.com — http://openwall.com/lists/oss-security/2017/05/10/1
• github.com — https://github.com/dropbox/lepton/commit/82167c144a322cc956da45407f6dce8d4303d34…
• github.com — https://github.com/dropbox/lepton/issues/87