CVE-2026-43971

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

0.52% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 44.1% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

Awaiting Analysis. NVD last modified this record on 2026-10-22.

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

2026-08-18 09:01Z2 MO AGO

Last updated

2026-09-16 20:24Z1 MO AGO

Reserved

2026-05-04

Assigning CNA

EEF

Record state

PUBLISHED

Severity

Medium (CVSS 6.3)

CNA CVSS vector

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

Weaknesses

• CWE-116Improper Encoding or Escaping of OutputClass
• CWE-838Inappropriate Encoding for Output ContextBase

Data version

5.2

Document digest

fa5c50551a0ee748df11fd43021a63c6b9d09fc1e98bf94fdede868a969fc82a

• cna.erlef.orgEEF CNA record for CVE-2026-43971https://cna.erlef.org/cves/CVE-2026-43971.htmlrelatedthird-party-advisory
• osv.devOSV record EEF-CVE-2026-43971https://osv.dev/vulnerability/EEF-CVE-2026-43971related
• github.comIntroducing commit 485d58d in ninenines/cowlibhttps://github.com/ninenines/cowlib/commit/485d58dfa91b91d98135dc95e5615f421715dae5related
• github.comFix commit 89da27e in ninenines/cowlibhttps://github.com/ninenines/cowlib/commit/89da27ee4c241f5d649ba7d9b7f2188918af6ceapatch