{"answers":{"affected":"4 open source packages ship an affected version, including com.squareup.wire:wire-runtime.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63126 exists.","fix":"Upgrade com.squareup.wire:wire-runtime to a fixed version for your release line: 6.4.5 or 7.0.0-alpha04.","what":"CVE-2026-63126 is a high-severity vulnerability in square wire, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-63126 and fix it if it is affected.\n\nWhat it is: CVE-2026-63126 is a high-severity vulnerability in square wire, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63126 exists.\n\nAffected packages and fixed versions:\n- com.squareup.wire:wire-runtime (Maven): affected all versions; fixed in 6.4.5\n- com.squareup.wire:wire-runtime (Maven): affected all versions; fixed in 6.4.5\n- com.squareup.wire:wire-runtime (Maven): affected from 7.0.0-alpha01; fixed in 7.0.0-alpha04\n- com.squareup.wire:wire-runtime (Maven): affected from 7.0.0-alpha01; fixed in 7.0.0-alpha04\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-63126/ (Markdown: https://insights.sbomify.com/CVE-2026-63126/index.md)","id":"CVE-2026-63126","markdown":"https://insights.sbomify.com/CVE-2026-63126/index.md","name":"CVE-2026-63126","record":{"aliases":["GHSA-9rm7-3qhh-h2mc"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Wire protobuf library","requires_auth":"none","summary":"An attacker can cause a denial of service in the Wire protobuf library by sending malformed data that triggers an integer overflow, leading to crashes or excessive allocation.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"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.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Wire: Unauthenticated decoder crash via 32-bit length integer overflow in ByteArrayProtoReader32 (incomplete fix of CVE-2026-45799)","id":"CVE-2026-63126","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":4,"n_references":6,"next":{"headline":"RMCP: Missing Resource Field Validation in OAuth Protected Resource Metadata Discovery","id":"CVE-2026-63127"},"packages":[{"ecosystem":"Maven","fixed":["6.4.5"],"introduced":["0"],"last_affected":[],"package":"com.squareup.wire:wire-runtime","purl":null,"source":"GHSA-9rm7-3qhh-h2mc"},{"ecosystem":"Maven","fixed":["6.4.5"],"introduced":["0"],"last_affected":[],"package":"com.squareup.wire:wire-runtime","purl":"pkg:maven/com.squareup.wire/wire-runtime","source":"GHSA-9rm7-3qhh-h2mc"},{"ecosystem":"Maven","fixed":["7.0.0-alpha04"],"introduced":["7.0.0-alpha01"],"last_affected":[],"package":"com.squareup.wire:wire-runtime","purl":null,"source":"GHSA-9rm7-3qhh-h2mc"},{"ecosystem":"Maven","fixed":["7.0.0-alpha04"],"introduced":["7.0.0-alpha01"],"last_affected":[],"package":"com.squareup.wire:wire-runtime","purl":"pkg:maven/com.squareup.wire/wire-runtime","source":"GHSA-9rm7-3qhh-h2mc"}],"prev":{"headline":"Incus vulnerable to root RCE via image backup.yaml symlink","id":"CVE-2026-63125"},"products":["wire"],"published":"2026-09-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-16","vendors":["square"]},"summary":"An attacker can cause a denial of service in the Wire protobuf library by sending malformed data that triggers an integer overflow, leading to crashes or excessive allocation.","url":"https://insights.sbomify.com/CVE-2026-63126/"}