CVE-2018-6337

folly::secureRandom will re-use a buffer between parent and child processes when fork() is called. That will result in multiple forked children producing repeat (or similar) results. This affects HHVM 3.26 prior to 3.26.3 and the folly library between v2017.12.11.00 and v2018.08.09.00.

• CWE-212
• CWE-119

• https://github.com/facebook/folly/commit/8e927ee48b114c8a2f90d0cbd5ac753795a6761fPatch, Third Party Advisory
• https://github.com/facebook/hhvm/commit/e2d10a1e32d01f71aaadd81169bcb9ae86c5d6b8Patch, Third Party Advisory
• https://hhvm.com/blog/2018/05/24/hhvm-3.26.3.htmlRelease Notes, Vendor Advisory
• https://github.com/facebook/folly/commit/8e927ee48b114c8a2f90d0cbd5ac753795a6761fPatch, Third Party Advisory
• https://github.com/facebook/hhvm/commit/e2d10a1e32d01f71aaadd81169bcb9ae86c5d6b8Patch, Third Party Advisory
• https://hhvm.com/blog/2018/05/24/hhvm-3.26.3.htmlRelease Notes, Vendor Advisory

Published

Dec 31, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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