CVE-2026-21991

MEDIUMNVD 5.55.5—

5.5

A DTrace component, dtprobed, allows arbitrary file creation through crafted USDT provider names.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 7.8%
KEV: Not listed

Published

March 16, 2026

Last Modified

April 7, 2026

References (1)

secalert_us@oraclehttps://linux.oracle.com/cve/CVE-2026-21991.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-22Path Traversal

Data Freshness Timeline

(refreshed 9× in last 7d / 56× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-23 21:32 UTCEPSS rescore
2026-06-22 14:25 UTCEPSS rescore
2026-06-22 14:25 UTCEPSS rescore
2026-06-21 14:56 UTCEPSS rescore
2026-06-21 14:56 UTCEPSS rescore
2026-06-21 01:59 UTCEPSS rescore
2026-06-21 01:59 UTCEPSS rescore
2026-06-19 19:25 UTCEPSS rescore
2026-06-17 17:53 UTCEPSS rescore
2026-06-16 17:52 UTCEPSS rescore
2026-06-15 17:48 UTCEPSS rescore
2026-06-14 23:18 UTCEPSS rescore
2026-06-13 23:00 UTCEPSS rescore
2026-06-13 23:00 UTCEPSS rescore
2026-06-12 23:12 UTCEPSS rescore
2026-06-11 23:54 UTCEG score recompute
2026-06-11 23:54 UTCGHSA enrichment
2026-06-11 14:00 UTCEPSS rescore
2026-06-10 22:18 UTCEPSS rescore
2026-06-10 17:50 UTCEG score recompute
2026-06-10 17:50 UTCGHSA enrichment
2026-06-09 16:40 UTCEG score recompute
2026-06-09 16:40 UTCGHSA enrichment
2026-06-08 14:17 UTCEPSS rescore
2026-06-08 14:17 UTCEPSS rescore

Show 39 more

2026-06-07 15:25 UTCEPSS rescore
2026-06-07 15:24 UTCEPSS rescore
2026-06-07 14:30 UTCEG score recompute
2026-06-07 14:30 UTCGHSA enrichment
2026-06-06 13:47 UTCEPSS rescore
2026-06-06 13:47 UTCEPSS rescore
2026-06-06 13:47 UTCEPSS rescore
2026-06-05 22:47 UTCEPSS rescore
2026-06-04 13:12 UTCEPSS rescore
2026-06-04 13:12 UTCEPSS rescore
2026-06-04 13:12 UTCEPSS rescore
2026-06-02 20:13 UTCEPSS rescore
2026-06-02 20:13 UTCEPSS rescore
2026-06-01 13:51 UTCEPSS rescore
2026-06-01 13:51 UTCEPSS rescore
2026-06-01 13:51 UTCEPSS rescore
2026-05-31 22:30 UTCEPSS rescore
2026-05-31 22:30 UTCEPSS rescore
2026-05-29 13:44 UTCEPSS rescore
2026-05-29 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-26 13:44 UTCEPSS rescore
2026-05-26 13:44 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-22 21:16 UTCEPSS rescore
2026-05-21 22:43 UTCEPSS rescore
2026-05-20 21:03 UTCEG score recompute
2026-05-20 21:03 UTCGHSA enrichment
2026-05-20 11:22 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-18 21:31 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-21991?

CVE-2026-21991 is a medium vulnerability published on March 16, 2026. A DTrace component, dtprobed, allows arbitrary file creation through crafted USDT provider names.

When was CVE-2026-21991 disclosed?

CVE-2026-21991 was first published in the National Vulnerability Database on March 16, 2026, with the most recent update on April 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-21991 actively exploited?

CVE-2026-21991 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-21991?

CVE-2026-21991 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2026-21991?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21991, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-21991

Explore →

Is Your Infrastructure Affected by CVE-2026-21991?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2026-21991

📅 Published

🔄 Last Modified

🔗 References (1)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-21991?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (1)

Frequently asked(5)

Related CVEs(same CWE)