Deep JSON nesting in FasterXML Jackson 1.x causes denial of service
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-674.
Summary
FasterXML Jackson 1.x, confirmed in jackson-mapper-asl versions 1.8.3, 1.9.2, 1.9.11, 1.9.12 and 1.9.13, has uncontrolled recursion (CWE-674) when it parses deeply nested JSON. An unauthenticated remote attacker can exhaust resources and cause a denial of service in an application that deserializes untrusted JSON with ObjectMapper.readValue.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
FasterXML Jackson 1.x, confirmed in jackson-mapper-asl versions 1.8.3, 1.9.2, 1.9.11, 1.9.12, and 1.9.13, allows attackers to cause a denial of service by supplying deeply nested JSON input to an application that deserializes untrusted JSON using ObjectMapper.readValue.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for FasterXML Jackson 1.x. Red Hat lists Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7 and Red Hat Single Sign-On 7 as affected without a fix, with no plan available.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Fuse 7 | Affected | No fix yet |
| Red Hat JBoss Enterprise Application Platform 7 | Affected | No fix yet |
| Red Hat Single Sign-On 7 | Affected | No fix yet |
Not affected: 1 product
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-16 Threatist record created from CVE-2026-95155
- 2026-11-05 Affected versions changed · Red Hat
- 2026-11-05 CVSS score added · Red Hat
- 2026-11-06 Affected versions changed · Red Hat
References
Sources
- CVE-2026-95155 · CVE Program
- CVE-2026-95155 · NVD
- FIRST EPSS
- CVE-2026-95155 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences