CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NCVE-2026-120971
Medium (5.3). EPSS 0.3% estimated probability of exploitation activity in the next 30 days.
On this page
A flaw was found in RESTEasy's default exception mapper. When an unhandled exception other than a WebApplicationException is not handled by an application exception mapper, RESTEasy returns the exception's localized message in the HTTP 500 response body. A remote unauthenticated attacker who can trigger such an exception may obtain information contained in that message. The behavior was reproduced with RESTEasy 7.0.2.Final.
Severity
- EPSS
- 0.3% estimated probability of exploitation activity in the next 30 days; 28th percentile. Scored 2026-11-04. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: yes · Technical impact: partial, assessed 2026-11-03. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-209 Generation of Error Message Containing Sensitive Information
- OWASP Top 10
- A10:2025 Mishandling of Exceptional Conditions
- Published
- Modified
- Record from
- the NVD, synced
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Explain CVE-2026-120971 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-120971?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-120971?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-120971 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Ubuntu | 22.04:LTS, 24.04:LTS, Pro:18.04:LTS | resteasy3.0 | no fix listed | UBUNTU-CVE-2026-120971 |
| Ubuntu | 26.04:LTS, 26.10, Pro:20.04:LTS | resteasy, resteasy3.0 | no fix listed | UBUNTU-CVE-2026-120971 |
| Ubuntu | Pro:16.04:LTS, Pro:22.04:LTS, Pro:24.04:LTS | resteasy | no fix listed | UBUNTU-CVE-2026-120971 |
From the distributions' data via OSV.dev: Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Ubuntu.
Attack patterns (CAPEC)
- CAPEC-7 Blind SQL Injection Likelihood: High · Severity: High
- CAPEC-54 Query System for Information Likelihood: High · Severity: Low
- CAPEC-215 Fuzzing for application mapping Likelihood: High · Severity: Low
- CAPEC-463 Padding Oracle Crypto Attack Severity: High
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.