{"affected":[{"defaultStatus":"unaffected","ecosystem":"https://repo.maven.apache.org/maven2","packageName":"com.fasterxml.jackson.dataformat:jackson-dataformat-cbor","product":"jackson-dataformat-cbor","source":"CNA: HeroDevs","vendor":"FasterXML","versions":[{"lessThan":"2.18.12","status":"affected","version":"2.15.0","versionType":"maven"},{"status":"unaffected","version":"2.18.12","versionType":"maven"},{"lessThan":"2.21.8","status":"affected","version":"2.19.0","versionType":"maven"},{"status":"unaffected","version":"2.21.8","versionType":"maven"},{"lessThan":"2.22.4","status":"affected","version":"2.22.0","versionType":"maven"},{"status":"unaffected","version":"2.22.4","versionType":"maven"}]},{"defaultStatus":"unaffected","ecosystem":"https://repo.maven.apache.org/maven2","packageName":"tools.jackson.dataformat:jackson-dataformat-cbor","product":"jackson-dataformat-cbor","source":"CNA: HeroDevs","vendor":"FasterXML","versions":[{"lessThan":"3.1.8","status":"affected","version":"3.0.0","versionType":"maven"},{"status":"unaffected","version":"3.1.8","versionType":"maven"},{"lessThan":"3.2.4","status":"affected","version":"3.2.0","versionType":"maven"},{"status":"unaffected","version":"3.2.4","versionType":"maven"}]}],"cveId":"CVE-2026-106554","cwes":["CWE-407"],"description":"One CBOR-parsing issue in jackson-dataformats-binary's CBOR module: an unbounded run of CBOR tags drives quadratic-time TagList growth (CPU/GC-exhaustion DoS, PoC-proven).\n\n\n\nPoC executed against com.fasterxml.jackson.dataformat:jackson-dataformat-cbor:2.18.2; present in current 2.x and 3.x (tools.jackson.dataformat.cbor) HEAD. Distinct from the Avro and Smile/Protobuf advisories for this repo.\n\n\n\nQuadratic CPU/GC DoS from an unbounded chain of CBOR tags (PoC-proven). File: cbor/src/main/java/.../cbor/CBORParser.java (tag handling -> TagList).\n\n\n\nCBOR permits a data item to be preceded by any number of semantic tags. The CBOR parser accumulates them in a TagList whose backing array grows by a fixed increment (+8), not by doubling, and re-scans/copies on each growth. An attacker sends a value preceded by a long run of tag bytes; the fixed-increment growth makes accumulating N tags O(N^2) in time (plus GC pressure), with no cap on the number of stacked tags.\n\n\n\nPoC (executed, JDK 17): feeding a CBOR stream consisting of a long run of tag bytes (e.g. tag 0xC0+) before a trivial value forces quadratic CPU/GC; parse time grows super-linearly with the tag count, pinning a request thread with no configurable limit.\n\n\n\nImpact. Algorithmic-complexity denial of service (CWE-407): a modest input of stacked tags consumes quadratic CPU/GC, pinning a request thread; concurrent requests exhaust the pool.\n\n\n\nFix. Grow TagList by doubling and/or cap the number of stacked tags (StreamReadConstraints-style).","epss":null,"exploits":[],"kev":null,"metrics":[],"modifiedAt":1793809052640,"publishedAt":1793808845664,"references":[{"source":"CNA: HeroDevs","tags":["vendor-advisory"],"url":"https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-cjg7-h3pr-p927"},{"source":"36c7be3b-2937-45df-85ea-ca7133ea542c","tags":[],"url":"https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-cjg7-h3pr-p927"}],"remediation":[],"revision":"fa8294ad9a25338e089cda36f6277bd867a93c74ea9ff710bb31b34921e6d054","sources":[{"modifiedAt":1793808845664,"name":"CNA: HeroDevs","retrievedAt":1793812119456,"url":"https://www.cve.org/CVERecord?id=CVE-2026-106554"},{"modifiedAt":1793809052640,"name":"NVD","retrievedAt":1793816706480,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106554"}],"ssvc":null,"status":"published","title":"jackson-dataformat-cbor: quadratic-time TagList growth on unbounded stacked tags (CPU/GC DoS, PoC)","updatedAt":1793816706480}