CVE-2026-33557

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 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

0.89% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 59.3% of scored records. A rank, not a probability.

NVD base score

9.1 (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:N

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

2026-04-20 13:28Z6 MO AGO

Last updated

2026-07-15 01:06Z3 MO AGO

Reserved

2026-03-23

Assigning CNA

apache

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

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

Weaknesses

• CWE-1285Improper Validation of Specified Index, Position, or Offset in InputBase
• CWE-303Incorrect Implementation of Authentication AlgorithmBase

Data version

5.2

Document digest

45a79a5265e7d0fc8fd58745a6d5599a8faee0eb5ad2f1325dcbbf4544793c29

• kafka.apache.orghttps://kafka.apache.org/cve-listvendor-advisory
• lists.apache.orghttps://lists.apache.org/thread/v57o00hm6yszdpdnvqx2ss4561yh953hmailing-list
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/04/17/2
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-33557vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2459739https://bugzilla.redhat.com/show_bug.cgi?id=2459739issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33557.jsonx_sadp-csaf-vex