Unrated
Withdrawn security advisory
Uncontrolled Recursion vulnerability in Protobuf.JSON.Decode in elixir-protobuf protobuf allows an unauthenticated remote attacker to crash the decoding process via a deeply nested JSON document. Any application that decodes attacker-supplied JSON with Protobuf.JSON.decode/3, Protobuf.JSON.decode!/3, or Protobuf.JSON.from_decoded/3 into a schema that contains a self-referential or cyclic message type is affected. In lib/protobuf/json/decode.ex, the embedded-message clause of decode_singular/3 recurses into internal_from_json_data/3 once per nesting level without incrementing or checking the decoder's depth counter. The depth guard increase_depth_and_maybe_throw/1 covers only the Google.Protobuf.ListValue and Google.Protobuf.Struct clauses, so the recursion_limit option has no effect on user-defined message types. Each nesting level allocates a stack frame and heap objects, and a sufficiently deep document exhausts the memory of the decoding process. Confidentiality and integrity are not affected. This issue affects protobuf: from 0.8.0 before 0.17.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- Not specified
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 16:37 UTC · Revision 1
Source evidence
Uncontrolled Recursion vulnerability in Protobuf.JSON.Decode in elixir-protobuf protobuf allows an unauthenticated remote attacker to crash the decoding process via a deeply nested JSON document. Any application that decodes attacker-supplied JSON with Protobuf.JSON.decode/3, Protobuf.JSON.decode!/3, or Protobuf.JSON.from_decoded/3 into a schema that contains a self-referential or cyclic message type is affected. In lib/protobuf/json/decode.ex, the embedded-message clause of decode_singular/3 recurses into internal_from_json_data/3 once per nesting level without incrementing or checking the decoder's depth counter. The depth guard increase_depth_and_maybe_throw/1 covers only the Google.Protobuf.ListValue and Google.Protobuf.Struct clauses, so the recursion_limit option has no effect on user-defined message types. Each nesting level allocates a stack frame and heap objects, and a sufficiently deep document exhausts the memory of the decoding process. Confidentiality and integrity are not affected. This issue affects protobuf: from 0.8.0 before 0.17.1.
osv:UBUNTU-CVE-2026-104635
protobuf
Fixed versions: Not specified
protobuf
Fixed versions: Not specified
protobuf
Fixed versions: Not specified
protobuf
Fixed versions: Not specified
protobuf
Fixed versions: Not specified
protobuf
Fixed versions: Not specified
protobuf
Fixed versions: Not specified
Complete source record
{
"id": "0f93ff97de93aeb5daf2055ebcb79e01f0f48db7114ecbbb410cc449009a54d8",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-104635",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-104635",
"summary": "Uncontrolled Recursion vulnerability in Protobuf.JSON.Decode in elixir-protobuf protobuf allows an unauthenticated remote attacker to crash the decoding process via a deeply nested JSON document. Any application that decodes attacker-supplied JSON with Protobuf.JSON.decode/3, Protobuf.JSON.decode!/3, or Protobuf.JSON.from_decoded/3 into a schema that contains a self-referential or cyclic message type is affected. In lib/protobuf/json/decode.ex, the embedded-message clause of decode_singular/3 recurses into internal_from_json_data/3 once per nesting level without incrementing or checking the decoder's depth counter. The depth guard increase_depth_and_maybe_throw/1 covers only the Google.Protobuf.ListValue and Google.Protobuf.Struct clauses, so the recursion_limit option has no effect on user-defined message types. Each nesting level allocates a stack frame and heap objects, and a sufficiently deep document exhausts the memory of the decoding process. Confidentiality and integrity are not affected. This issue affects protobuf: from 0.8.0 before 0.17.1.",
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],
"modified": "2026-10-21T23:00:22.106519147Z",
"provider": "osv",
"upstream": [
"CVE-2026-104635"
],
"references": [
"https://ubuntu.com/security/CVE-2026-104635",
"https://www.cve.org/CVERecord?id=CVE-2026-104635",
"https://cna.erlef.org/cves/CVE-2026-104635.html",
"https://github.com/elixir-protobuf/protobuf/commit/b0a1d4eaffaf50012fa71a8e931a47cf252d0370",
"https://github.com/elixir-protobuf/protobuf/commit/e9432ad1c4099511905353cebcececa3a1f7c3ff",
"https://github.com/elixir-protobuf/protobuf/security/advisories/GHSA-m497-c2h9-rvw6",
"https://osv.dev/vulnerability/EEF-CVE-2026-104635"
]
},
"related_cves": [
{
"value": "CVE-2026-104635",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 401033,
"published_at": "2026-10-13T00:00:00+00:00"
}