How severe is CVE-2026-33644?

CVE-2026-33644 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-33644 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33644?

CVE-2026-33644 affects Lycheeorg Lychee. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33644?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33644 have an EU (EUVD) identifier?

Yes. CVE-2026-33644 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16374.

When was CVE-2026-33644 published?

CVE-2026-33644 was published on 2026-03-26 and last updated on 2026-06-17.

CVE-2026-33644

CVE-2026-33644 is a medium-severity vulnerability in Lycheeorg Lychee with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v4: 2.3
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16374
Weakness: CWE-918
Affected product: Lycheeorg Lychee
Published: 2026-03-26
Last modified: 2026-06-17

Description

Lychee is a free, open-source photo-management tool. Prior to version 7.5.2, the SSRF protection in `PhotoUrlRule.php` can be bypassed using DNS rebinding. The IP validation check (line 86-89) only activates when the hostname is an IP address. When a domain name is used, `filter_var($host, FILTER_VALIDATE_IP)` returns `false`, skipping the entire check. Version 7.5.2 patches the issue.

Frequently asked questions

What is CVE-2026-33644?: Lychee is a free, open-source photo-management tool. Prior to version 7.5.2, the SSRF protection in `PhotoUrlRule.php` can be bypassed using DNS rebinding. The IP validation check (line 86-89) only activates when the hostname is an IP address. When a domain name is used, `filter_var($host, FILTER_VALIDATE_IP)` returns `false`, skipping the entire check. Version 7.5.2 patches the issue.
How severe is CVE-2026-33644?: CVE-2026-33644 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-33644 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33644?: CVE-2026-33644 affects Lycheeorg Lychee. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33644?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33644 have an EU (EUVD) identifier?: Yes. CVE-2026-33644 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16374.
When was CVE-2026-33644 published?: CVE-2026-33644 was published on 2026-03-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lycheeorg:lychee:*:*:*:*:*:*:*:*

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