CVE-2026-33721

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.
• 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

1.22% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 68.4% of scored records. A rank, not a probability.

NVD base score

7.5 (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:N/I:N/A:H

NVD analysis status

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

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

2026-03-27 00:15Z7 MO AGO

Last updated

2026-04-17 17:18Z6 MO AGO

Reserved

2026-03-23

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

c90dd8331a1cdbc9df7227430b1565678dcd98c15ca842ae4c0ebd7abb441c7b

• github.comhttps://github.com/MapServer/MapServer/security/advisories/GHSA-cv4m-mr84-fgjpx_refsource_CONFIRM
• github.comhttps://github.com/MapServer/MapServer/releases/tag/rel-8-6-1x_refsource_MISC
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2026/04/msg00017.html