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CVE-2026-106554VulnerabilityPublished Updated

Jackson dataformat cbor: One CBOR-parsing issue

Affects jackson-dataformat-cborSource GCVE Database

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Authoritative record:CVE-2026-106554· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 13 Nov 2026, 22:04 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CISA-ADPCVSS 3.17.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 13 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10jackson-dataformat-cborpkg:deb/ubuntu/jackson-dataformat-cbor?arch=source&distro=stonkingOther threatsAffected
  • =2.7.8-5.1
Fixed in–
Ubuntu 26.04 LTSjackson-dataformat-cborpkg:deb/ubuntu/jackson-dataformat-cbor?arch=source&distro=resoluteOther threatsAffected
  • =2.7.8-5.1
Fixed in–
Ubuntu 24.04 LTSjackson-dataformat-cborpkg:deb/ubuntu/jackson-dataformat-cbor?arch=source&distro=nobleOther threatsAffected
  • =2.7.8-5
Fixed in–
Ubuntu 22.04 LTSjackson-dataformat-cborpkg:deb/ubuntu/jackson-dataformat-cbor?arch=source&distro=jammyOther threatsAffected
  • =2.7.8-3
  • =2.7.8-4
  • =2.7.8-5
Fixed in–
Ubuntu 20.04 LTSjackson-dataformat-cborpkg:deb/ubuntu/jackson-dataformat-cbor?arch=source&distro=focalOther threatsAffected
  • =2.7.8-3
Fixed in–
Ubuntu 18.04 LTSjackson-dataformat-cborpkg:deb/ubuntu/jackson-dataformat-cbor?arch=source&distro=bionicOther threatsAffected
  • =2.7.8-1
  • =2.7.8-2
  • =2.7.8-3
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).

References

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