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Public proof of conceptFix availableAwaiting NVD analysis

CVE-2026-106554

jackson-dataformat-cbor: quadratic-time TagList growth on unbounded stacked tags (CPU/GC DoS, PoC)

A public proof of concept exists; no exploitation attested.

  • Published2026-11-04
  • WeaknessCWE-407

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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).

Timeline

dates in UTC
  1. 2026-11-0416:14CVE publishedCNA

Versions per branch

Products declared by the CNA2 products

As HeroDevs, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • FasterXML jackson-dataformat-cborother versions: not affected

    package com.fasterxml.jackson.dataformat:jackson-dataformat-cborhttps://repo.maven.apache.org/maven2

    Affected
    • ≥ 2.15.0, < 2.18.12fixed in 2.18.12maven
    • ≥ 2.19.0, < 2.21.8fixed in 2.21.8maven
    • ≥ 2.22.0, < 2.22.4fixed in 2.22.4maven

    Not affected = 2.18.12 · = 2.21.8 · = 2.22.4

  • FasterXML jackson-dataformat-cborother versions: not affected

    package tools.jackson.dataformat:jackson-dataformat-cborhttps://repo.maven.apache.org/maven2

    Affected
    • ≥ 3.0.0, < 3.1.8fixed in 3.1.8maven
    • ≥ 3.2.0, < 3.2.4fixed in 3.2.4maven

    Not affected = 3.1.8 · = 3.2.4

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-04

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • jackson-dataformat-cborUbuntu:26.10all versions · no fixed version listed
  • jackson-dataformat-cborUbuntu:26.04:LTSall versions · no fixed version listed
  • jackson-dataformat-cborUbuntu:24.04:LTSall versions · no fixed version listed
  • jackson-dataformat-cborUbuntu:22.04:LTSall versions · no fixed version listed
  • jackson-dataformat-cborUbuntu:20.04:LTSall versions · no fixed version listed
  • jackson-dataformat-cborUbuntu:18.04:LTSall versions · no fixed version listed
  • jackson-dataformat-cborUbuntu:16.04:LTSall versions · no fixed version listed
  • jackson-dataformat-cborDebian:13all versions · no fixed version listed

2 more package ranges on OSV.dev

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-11-10
  • CISA-ADPSSVC decisionpoc2026-11-10
  • CISA-ADPCVSS 3.17.52026-11-10
  • CNAweakness (CWE)CWE-4072026-11-04
  • FIRST EPSSEPSS score0.2 %2026-11-09
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-11-04
Last Modified
2026-11-10
NVD status
Received

Frequently asked questions

What is CVE-2026-106554?

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).

Is CVE-2026-106554 actively exploited?

A proof-of-concept exploit exists for CVE-2026-106554, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-106554?

CVE-2026-106554 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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