{"cve":"CVE-2026-63126","nvd":{"published":"2026-09-16T19:17:24.013","modified":"2026-09-30T17:43:24.057","status":"Awaiting Analysis","description":"Wire provides gRPC and protocol buffers for Android, Kotlin, Swift, and Java. Prior to 6.4.5 and 7.0.0-alpha04, Wire protobuf readers do not consistently validate attacker-controlled lengths against the current logical message boundary before advancing cursors, pointers, limits, slices, or allocations. In Kotlin, ProtoAdapter.decode(ByteArray) and ProtoAdapter.decode(ByteString) use ByteArrayProtoReader32.internalNextLengthDelimited(), where a positive oversized length can wrap pos + length to a negative limit and escape the existing negative-length check. Related ProtoReader, ReadBuffer.readVarint(), ReadBuffer.verifyAdditional(count:), packed-repeated, nested-message, and ProtoDecoder.decodeSizeDelimited(_:from:) paths can cross logical boundaries, perform pointer arithmetic, reserve capacity, or convert an unrepresentable size before proving the requested bytes exist. An attacker who supplies malformed protobuf bytes can cause unchecked exceptions, traps, out-of-bounds behavior, or excessive allocation, resulting in denial of service without known confidentiality, integrity, or code-execution impact. This issue is fixed in versions 6.4.5 and 7.0.0-alpha04.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-190"],"references":["https://github.com/square/wire/commit/082d5d83cec57ef68f1dd7d3e3d1d641c1fb670f","https://github.com/square/wire/commit/25ebcabb9ab7f12d1d77af75ecbc51726fddc015","https://github.com/square/wire/pull/3635","https://github.com/square/wire/releases/tag/6.4.5","https://github.com/square/wire/releases/tag/7.0.0-alpha04"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-63126","score":0.00823,"percentile":0.57063,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-9rm7-3qhh-h2mc","url":"https://osv.dev/vulnerability/GHSA-9rm7-3qhh-h2mc","summary":"Wire: Unauthenticated decoder crash via 32-bit length integer overflow in ByteArrayProtoReader32 (incomplete fix of CVE-2026-45799)","modified":"2026-09-17T15:00:06.855019559Z","packages":[{"ecosystem":"Maven","name":"com.squareup.wire:wire-runtime","purl":"pkg:maven/com.squareup.wire/wire-runtime","ranges":["<6.4.5"],"fixed":["6.4.5"]},{"ecosystem":"Maven","name":"com.squareup.wire:wire-runtime","purl":"pkg:maven/com.squareup.wire/wire-runtime","ranges":[">=7.0.0-alpha01 <7.0.0-alpha04"],"fixed":["7.0.0-alpha04"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}