CVE-2026-42027

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.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total 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

0.70% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 53.1% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-26.

Red Hat severity

Important. 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

2026-05-04 16:43Z5 MO AGO

Last updated

2026-09-09 12:04Z1 MO AGO

Reserved

2026-04-23

Assigning CNA

apache

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

• CWE-470Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')Base
• CWE-502Deserialization of Untrusted DataBase

Data version

5.2

Document digest

f324dbb5e80e5b6d053c39128460d8596595e1641d94ecad49f2bf11127fe885

• lists.apache.orghttps://lists.apache.org/thread/ltlo4powjfc0w2w2yyl1o5tc7q1gcb2yvendor-advisory
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/05/01/20
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-42027vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2466527https://bugzilla.redhat.com/show_bug.cgi?id=2466527issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42027.jsonx_sadp-csaf-vex
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:65126vendor-advisoryx_refsource_REDHAT