CVE-2026-1979

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.15% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 5.0% of scored records. A rank, not a probability.

NVD base score

1.9 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-02-06 04:32Z7 MO AGO

Last updated

2026-02-23 09:21Z6 MO AGO

Reserved

2026-02-05

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 4.8)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-416Use After FreeVariant

Data version

5.2

Document digest

6bb0ed19e3109dabd4733c06316690ea00a93ced73cdd4db34930c76582be064

• vuldb.comVDB-344501 | mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after freehttps://vuldb.com/?id.344501vdb-entrytechnical-description
• vuldb.comVDB-344501 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/?ctiid.344501signaturepermissions-required
• vuldb.comSubmit #743377 | mruby cda2567 Use After Freehttps://vuldb.com/?submit.743377third-party-advisory
• github.comhttps://github.com/mruby/mruby/issues/6701issue-tracking
• github.comhttps://github.com/mruby/mruby/issues/6701#issue-3802609843exploitissue-tracking
• github.comhttps://github.com/sysfce2/mruby/commit/e50f15c1c6e131fa7934355eb02b8173b13df415patch
• github.comhttps://github.com/mruby/mruby/product