CVE-2026-84895

Summary

In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields after calling the base QuicWtSessionBase::closeSession method. The base method notifies the session handler, which may release the last reference to the session and destroy it.

Affected Software

Weaknesses

• Use After Free (CWE-416)

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://www.facebook.com/security/advisories/cve-2026-84895
• https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083

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