DEBIAN-CVE-2026-106554
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-106554
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-106554.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-106554
- Upstream
- Published
- 2026-11-04T16:17:32Z
- Modified
- 2026-11-08T01:00:07Z
- Summary
- [none]
- Details
-
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). PoC 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. Quadratic CPU/GC DoS from an unbounded chain of CBOR tags (PoC-proven). File: cbor/src/main/java/.../cbor/CBORParser.java (tag handling -> TagList). CBOR 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. PoC (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. Impact. 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. Fix. Grow TagList by doubling and/or cap the number of stacked tags (StreamReadConstraints-style).
- References
Affected packages
Debian:12 / jackson-dataformat-cbor
Package
- Name
- jackson-dataformat-cbor
- Purl
- pkg:deb/debian/jackson-dataformat-cbor?arch=source&distro=bookworm
Debian:13 / jackson-dataformat-cbor
Package
- Name
- jackson-dataformat-cbor
- Purl
- pkg:deb/debian/jackson-dataformat-cbor?arch=source&distro=trixie
Debian:14 / jackson-dataformats-binary
Package
- Name
- jackson-dataformats-binary
- Purl
- pkg:deb/debian/jackson-dataformats-binary?arch=source&distro=forky