CVE-2026-106554: FasterXML jackson-dataformat-cbor · Inefficient Algorithmic Complexity
Affects FasterXML jackson-dataformat-cborSource CVE Database V5
Not known to be exploited · fixed in 2.22.4 : update FasterXML jackson-dataformat-cbor when convenient.
Data as of 4 Nov 2026, 16:43 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in 2.22.4, 2.21.8, 2.18.12 +2
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.
What to do
Upgrade jackson-dataformat-cbor and com.fasterxml.jackson.dataformat/jackson-dataformat-cbor to 2.22.4, 2.21.8 or 2.18.12; jackson-dataformat-cbor and tools.jackson.dataformat/jackson-dataformat-cbor to 3.2.4 or 3.1.8.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| jackson-dataformat-cborcom.fasterxml.jackson.dataformat:jackson-dataformat-cbor | Affected
| Fixed in
|
| jackson-dataformat-cborcom.fasterxml.jackson.dataformat:jackson-dataformat-cbor | Affected
| Fixed in
|
| jackson-dataformat-cborcom.fasterxml.jackson.dataformat:jackson-dataformat-cbor | Affected
| Fixed in
|
| jackson-dataformat-cbortools.jackson.dataformat:jackson-dataformat-cbor | Affected
| Fixed in
|
| jackson-dataformat-cbortools.jackson.dataformat:jackson-dataformat-cbor | Affected
| Fixed in
|
Mavencom.fasterxml.jackson.dataformat/jackson-dataformat-cborpkg:maven/com.fasterxml.jackson.dataformat/jackson-dataformat-cborOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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). 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).