Is there a public exploit for CVE-2026-123635?

No public exploit for CVE-2026-123635 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-123635?

CVE-2026-123635 scores CVSS 6.3 (v4.0), rated medium.

What does CVE-2026-123635 affect?

CVE-2026-123635 affects elixir-grpc grpc_server.

6.3 Medium

Missing Release of Resource after Effective Lifetime vulnerability in elixir-grpc grpcserver allows a client to stall all later calls on a…

CVE-2026-123635

Missing Release of Resource after Effective Lifetime vulnerability in elixir-grpc grpcserver allows a client to stall all later calls on a shared HTTP/2 connection via calls that the server refuses while their DATA frames are in flight. The stream handler grpcstreamh (grpcserver/src/grpcstreamh.erl) requests flow from Cowboy only for request data that has arrived. When the server refuses a call early, for example because the body exceeds maxbodysize or the method is not implemented, Cowboy drops the DATA frames still in flight for that stream. Their bytes are not returned to the connection flow-control window. After enough refused calls the window is empty. No call on that connection can then send a request body, and each call waits until its deadline. Other connections are not affected. This issue affects grpcserver: from 1.0.0 before 1.1.0.

Assessment

CVSS: 6.3 (v4.0)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 November 2026
Last updated: 13 November 2026
Affected: elixir-grpc · grpc_server
Assigner: EEF

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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