What is CVE-2026-12549?

CVE-2026-12549 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Buffer Access with Incorrect Length Value. CVSS score: 4.8/10. Published 2026-06-22.

How severe is CVE-2026-12549?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Red Hat Enterprise Linux 10

CVE-2026-12549

The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulti…

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L.

Affected products

Weakness classification (CWE)

CWE-805 — Buffer Access with Incorrect Length Value

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, technical-description)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)
secalert@redhat.com

Frequently asked questions

What is CVE-2026-12549?: CVE-2026-12549 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Buffer Access with Incorrect Length Value. CVSS score: 4.8/10. Published 2026-06-22.
How severe is CVE-2026-12549?: Medium severity. CVSS v3 base score is 4.8 out of 10.