How severe is CVE-2026-29178?

CVE-2026-29178 has a CVSS 4.0 base score of 7.7, rated high severity.

Is CVE-2026-29178 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-29178?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-29178 have an EU (EUVD) identifier?

Yes. CVE-2026-29178 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10053.

When was CVE-2026-29178 published?

CVE-2026-29178 was published on 2026-03-06 and last updated on 2026-06-17.

CVE-2026-29178

CVE-2026-29178 is a high-severity vulnerability with a CVSS 4.0 base score of 7.7. 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: High (CVSS 4.0 base score 7.7)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10053
Weakness: CWE-918
Published: 2026-03-06
Last modified: 2026-06-17

Description

Lemmy, a link aggregator and forum for the fediverse, is vulnerable to server-side request forgery via a dependency on activitypub_federation, a framework for ActivityPub federation in Rust. Prior to version 0.19.16, the GET /api/v4/image/{filename} endpoint is vulnerable to unauthenticated SSRF through parameter injection in the file_type query parameter. An attacker can inject arbitrary query parameters into the internal request to pict-rs, including the proxy parameter which causes pict-rs to fetch arbitrary URLs. This issue has been patched in version 0.19.16.

Frequently asked questions

What is CVE-2026-29178?: Lemmy, a link aggregator and forum for the fediverse, is vulnerable to server-side request forgery via a dependency on activitypub_federation, a framework for ActivityPub federation in Rust. Prior to version 0.19.16, the GET /api/v4/image/{filename} endpoint is vulnerable to unauthenticated SSRF through parameter injection in the file_type query parameter. An attacker can inject arbitrary query parameters into the internal request to pict-rs, including the proxy parameter which causes pict-rs to fetch arbitrary URLs. This issue has been patched in version 0.19.16.
How severe is CVE-2026-29178?: CVE-2026-29178 has a CVSS 4.0 base score of 7.7, rated high severity.
Is CVE-2026-29178 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-29178?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-29178 have an EU (EUVD) identifier?: Yes. CVE-2026-29178 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10053.
When was CVE-2026-29178 published?: CVE-2026-29178 was published on 2026-03-06 and last updated on 2026-06-17.

References

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities

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