CVE-2018-15503 — The unpack implementation in Swoole version 4

The unpack implementation in Swoole version 4.0.4 lacks correct size checks in the deserialization process. An attacker can craft a serialized object to exploit this vulnerability and cause a SEGV.

01What is this vulnerability?

The unpack implementation in Swoole version 4.0.4 lacks correct size checks in the deserialization process. An attacker can craft a serialized object to exploit this vulnerability and cause a SEGV.

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: 2018-08-18T02:00:00.000Z
• Last modified: 2024-08-05T09:54:03.442Z

09References

• github.com — https://github.com/swoole/swoole-src/issues/1882
• github.com — https://github.com/swoole/swoole-src/commit/4cdbce5d9bf2fe596bb6acd7d6611f9e8c25…
• x-c3ll.github.io — https://x-c3ll.github.io/posts/swoole-deserialization-cve-2018-15503/