{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-48853: Remote code execution and denial of service via unsafe Erlang term deserialization in elixir-grpc/grpc","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-48853","status":"final","version":"1","initial_release_date":"2026-06-15T21:56:15.262Z","current_release_date":"2026-06-15T21:56:15.262Z","revision_history":[{"date":"2026-06-15T21:56:15.262Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Deserialization of Untrusted Data and Allocation of Resources Without Limits or Throttling vulnerabilities in elixir-grpc grpc allow unauthenticated attackers to crash the BEAM node via atom table exhaustion and, when a decoded term flows into a call site that invokes it, achieve remote code execution on the server.\n\n'Elixir.GRPC.Codec.Erlpack':decode/2 (lib/grpc/codec/erlpack.ex) calls :erlang.binary_to_term/1 on the raw gRPC message body without the :safe option, no size bound, and no type guard. Any unauthenticated peer that sends a request with Content-Type: application/grpc+erlpack can send a crafted payload that mints arbitrary new atoms (which are never garbage-collected, exhausting the bounded atom table and crashing the VM) or that encodes a fun term which, if applied anywhere downstream, executes attacker-controlled code inside the server process.\n\nThis issue affects grpc from 0.4.0 before 1.0.0.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-48853 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-48853"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-48853"},{"category":"external","summary":"github.com","url":"https://github.com/elixir-grpc/grpc/security/advisories/GHSA-grp7-v8xh-rj7h"},{"category":"external","summary":"cna.erlef.org","url":"https://cna.erlef.org/cves/CVE-2026-48853.html"},{"category":"external","summary":"osv.dev","url":"https://osv.dev/vulnerability/EEF-CVE-2026-48853"},{"category":"external","summary":"github.com","url":"https://github.com/elixir-grpc/grpc/commit/272a97a5ea1b46af1819f14a831fcf35fc91f992"}]},"product_tree":{"branches":[{"category":"vendor","name":"elixir-grpc","branches":[{"category":"product_name","name":"grpc","branches":[{"category":"product_version_range","name":">=0.4.0 <1.0.0","product":{"name":"elixir-grpc grpc >=0.4.0 <1.0.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"elixir-grpc","branches":[{"category":"product_name","name":"grpc","branches":[{"category":"product_version_range","name":">=25bcc569fe2cc4478531a6c546c923205fc751c9 <272a97a5ea1b46af1819f14a831fcf35fc91f992","product":{"name":"elixir-grpc grpc >=25bcc569fe2cc4478531a6c546c923205fc751c9 <272a97a5ea1b46af1819f14a831fcf35fc91f992","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-48853","title":"Remote code execution and denial of service via unsafe Erlang term deserialization in elixir-grpc/grpc","notes":[{"category":"description","text":"Deserialization of Untrusted Data and Allocation of Resources Without Limits or Throttling vulnerabilities in elixir-grpc grpc allow unauthenticated attackers to crash the BEAM node via atom table exhaustion and, when a decoded term flows into a call site that invokes it, achieve remote code execution on the server.\n\n'Elixir.GRPC.Codec.Erlpack':decode/2 (lib/grpc/codec/erlpack.ex) calls :erlang.binary_to_term/1 on the raw gRPC message body without the :safe option, no size bound, and no type guard. Any unauthenticated peer that sends a request with Content-Type: application/grpc+erlpack can send a crafted payload that mints arbitrary new atoms (which are never garbage-collected, exhausting the bounded atom table and crashing the VM) or that encodes a fun term which, if applied anywhere downstream, executes attacker-controlled code inside the server process.\n\nThis issue affects grpc from 0.4.0 before 1.0.0.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","baseScore":9.2,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1","CSAFPID-2"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 1.0.0, 272a97a5ea1b46af1819f14a831fcf35fc91f992.","product_ids":["CSAFPID-1","CSAFPID-2"],"url":"https://github.com/elixir-grpc/grpc/commit/272a97a5ea1b46af1819f14a831fcf35fc91f992"}]}]}