CVE-2026-6994

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• 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

0.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 13.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

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

2026-04-25 19:00Z4 MO AGO

Last updated

2026-04-27 17:17Z4 MO AGO

Reserved

2026-04-24

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Class
• CWE-707Improper NeutralizationPillar
• CWE-915Improperly Controlled Modification of Dynamically-Determined Object AttributesBase

Data version

5.2

Document digest

948f7b63b167947cf80f5d50716d173566e344e7c88e3e954f72a0db97a6e707

• vuldb.comVDB-359546 | Envoy Query Parameter header_mutation.cc params.add injectionhttps://vuldb.com/vuln/359546vdb-entrytechnical-description
• vuldb.comVDB-359546 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/359546/ctisignaturepermissions-required
• vuldb.comSubmit #797241 | Envoy >= 1.33.0 Injection (CWE-74)https://vuldb.com/submit/797241third-party-advisory
• github.comhttps://github.com/envoyproxy/envoy/pull/43502/issue-trackingpatch
• github.comhttps://github.com/envoyproxy/envoy/commit/f8f4f1e02fdc64ecd4acf2d903208dd7285ad3a4patch