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2 vulnerabilities found for jackson-dataformat-cbor by FasterXML
CVE-2026-106554 (GCVE-0-2026-106554)
Vulnerability from nvd – Published: 2026-11-04 16:14 – Updated: 2026-11-04 16:14 X_Open Source
VLAI
EPSS
VEX
Title
jackson-dataformat-cbor: quadratic-time TagList growth on unbounded stacked tags (CPU/GC DoS, PoC)
Summary
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).
Severity
No CVSS data available.
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/FasterXML/jackson-dataformats-… | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| FasterXML | jackson-dataformat-cbor |
Affected:
2.15.0 , < 2.18.12
(maven)
Unaffected: 2.18.12 (maven) Affected: 2.19.0 , < 2.21.8 (maven) Unaffected: 2.21.8 (maven) Affected: 2.22.0 , < 2.22.4 (maven) Unaffected: 2.22.4 (maven) |
|
| FasterXML | jackson-dataformat-cbor |
Affected:
3.0.0 , < 3.1.8
(maven)
Unaffected: 3.1.8 (maven) Affected: 3.2.0 , < 3.2.4 (maven) Unaffected: 3.2.4 (maven) |
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CVE-2026-106554 (GCVE-0-2026-106554)
Vulnerability from cvelistv5 – Published: 2026-11-04 16:14 – Updated: 2026-11-04 16:14 X_Open Source
VLAI
EPSS
VEX
Title
jackson-dataformat-cbor: quadratic-time TagList growth on unbounded stacked tags (CPU/GC DoS, PoC)
Summary
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).
Severity
No CVSS data available.
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/FasterXML/jackson-dataformats-… | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| FasterXML | jackson-dataformat-cbor |
Affected:
2.15.0 , < 2.18.12
(maven)
Unaffected: 2.18.12 (maven) Affected: 2.19.0 , < 2.21.8 (maven) Unaffected: 2.21.8 (maven) Affected: 2.22.0 , < 2.22.4 (maven) Unaffected: 2.22.4 (maven) |
|
| FasterXML | jackson-dataformat-cbor |
Affected:
3.0.0 , < 3.1.8
(maven)
Unaffected: 3.1.8 (maven) Affected: 3.2.0 , < 3.2.4 (maven) Unaffected: 3.2.4 (maven) |
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