Is CVE-2026-12549 in the CISA KEV catalog?

No. CVE-2026-12549 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-12549?

CVE-2026-12549 has a CVSS v3 base score of 4.8 (MEDIUM).

What is the EPSS score for CVE-2026-12549?

CVE-2026-12549 has an EPSS score of 0.33% (25th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-12549?

No published fix for CVE-2026-12549 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-12549

MEDIUM

4.8

CVSS v3

NVD

Description

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 resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding.

CWE-805

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.33%probability of exploitation in 30 days

25thpercentile

Low risk: more likely to be exploited than 25% of all known CVEs.

References

Patch1

gitlab.gnome.org

Vendor Advisory3

Related Vulnerabilities

Other CWE-805 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-14509	Critical	9.8	2.0%	-	Fix
CVE-2025-23319	High	8.1	1.6%	-	Fix
CVE-2024-24851	High	7.5	1.4%	-	-
CVE-2021-31885	High	7.5	1.2%	-	Fix
CVE-2023-20049	High	8.6	1.0%	-	Fix
CVE-2020-16101	High	7.5	1.0%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-08.