CVE-2025-56264: The /api/comment endpoint in zhangyd-c OneBlog 2.3.9 contains a denial-of-service vulnerability.

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2025-56264 is a high-severity flaw (CVSS 7.5) affecting oneblog. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The /api/comment endpoint in zhangyd-c OneBlog 2.3.9 contains a denial-of-service vulnerability.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-400
Published	2025-09-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zhyd

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-16 20:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

zhyd oneblog DOWNGRADE

Affected: 2.3.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3.9

1. Check installed version

apt-cache policy oneblog || rpm -q oneblog || oneblog --version

2. No fixed release: DOWNGRADE to a release before 2.3.9 (Debian / Ubuntu)

apt-cache madison oneblog sudo apt install oneblog=<VERSION_BEFORE_2.3.9> sudo apt-mark hold oneblog

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list oneblog sudo dnf downgrade oneblog-<VERSION_BEFORE_2.3.9> sudo dnf versionlock add oneblog

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-56264?

oneblog: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-56264 being exploited?

CVE-2025-56264 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-56264 affect?

CVE-2025-56264 affects oneblog. Severity is high (CVSS 7.5). The /api/comment endpoint in zhangyd-c OneBlog 2.3.9 contains a denial-of-service vulnerability.

How urgent is CVE-2025-56264?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-60355 CRITICAL 9.8 UPGRADE zhangyd-c OneBlog v2.3.9 and before was vulnerable to SSTI (Server-Side Template Injection) via FreeMarker tem
CVE-2025-2835 MEDIUM 4.3 UPGRADE A vulnerability was found in zhangyd-c OneBlog up to 2.3.9
CVE-2025-2833 MEDIUM 5.3 UPGRADE A vulnerability was found in zhangyd-c OneBlog up to 2.3.9
CVE-2024-54954 HIGH 8.0 UPGRADE OneBlog v2.3.6 was discovered to contain a template injection vulnerability via the template management depart
CVE-2024-29474 MEDIUM 5.4 DOWNGRADE OneBlog v2.3.4 was discovered to contain a stored cross-site scripting (XSS) vulnerability via the User Manage

References

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