CVE-2026-33693

CVE-2026-33693: SSRF via 0.0.0.0 Bypass in activitypub-federation-rust v4isinvalid CVSS 6.5 Moderate Keywords: SSRF, 0.0.0.0, IP validation bypass, activitypub-federation, Lemmy, Rust, ActivityPub Table of Contents Overview Vulnerability Details Technical Analysis Attack Chain Impact Remediation...

CVE-2026-73211 PeerTube: Unauthenticated remote SQL injection in ActorFollowModel.updateScore()

PeerTube is an ActivityPub-federated video streaming platform. Prior to 8.1.6, ActorFollowModel.updateScore interpolates the attacker-controlled ActivityPub actor inboxUrl into an SQL query, allowing an unauthenticated remote server to read and write PeerTube database tables, including...

WS-2026-0016

NodeBB before v4.14.0: stored XSS in the ActivityPub federation errors admin page - id, type, activityType and body of inbound AP objects rendered without escaping. Fixed in 4.14.0. One of eight Aikido-disclosed flaws; no CVE assigned...

EUVD-2026-42952

PeerTube is an ActivityPub-federated video streaming platform. Prior to 8.2.2, server-side-rendered video watch pages embed a schema.org JSON-LD block by JSON.stringify-ing video metadata without escaping less-than, greater-than, or slash characters, allowing a value containing the byte sequence...

CVE-2026-58593

NodeBB is affected by CVE-2026-58593 where inbound ActivityPub objects are not correctly bound to the authenticated remote actor. The middleware verifies the HTTP-signature actor and origin of object.id but does not validate that attributedTo corresponds to the sender, treating attributedTo as a ...

CVE-2026-33693

Lemmy’s Activitypub-Federation vulnerable component: Rust-based v4_is_invalid() in activitypub_federation-rust fails to check IPv4Addr::UNSPECIFIED (0.0.0.0). An unauthenticated attacker controlling a remote domain could direct 0.0.0.0 and bypass SSRF protections, reaching localhost services on t...

CVE-2026-33693 Lemmy's Activitypub-Federation has SSRF via 0.0.0.0 bypass in activitypub-federation-rust v4_is_invalid()

Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the v4isinvalid function in activitypub-federation-rust src/utils.rs does not check for Ipv4Addr::UNSPECIFIED 0.0.0.0. An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the...

CVE-2026-33693 Lemmy's Activitypub-Federation has SSRF via 0.0.0.0 bypass in activitypub-federation-rust v4_is_invalid()

Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the v4isinvalid function in activitypub-federation-rust src/utils.rs does not check for Ipv4Addr::UNSPECIFIED 0.0.0.0. An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the...

CVE-2026-33693 Lemmy's Activitypub-Federation has SSRF via 0.0.0.0 bypass in activitypub-federation-rust v4_is_invalid()

Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the v4isinvalid function in activitypub-federation-rust src/utils.rs does not check for Ipv4Addr::UNSPECIFIED 0.0.0.0. An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the...

CVE-2026-33693

Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the "v4isinvalid" function in "activitypub-federation-rust" "src/utils.rs" does not check for "Ipv4Addr::UNSPECIFIED" 0.0.0.0. An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0,...

CVE-2026-33693: Server-Side Request Forgery (SSRF)

Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the v4isinvalid function in activitypub-federation-rust src/utils.rs does not check for Ipv4Addr::UNSPECIFIED 0.0.0.0. An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the...

GHSA-Q537-8FR5-CW35 Activitypub-Federation has SSRF via 0.0.0.0 bypass in activitypub-federation-rust v4_is_invalid()

Summary The v4isinvalid function in activitypub-federation-rust src/utils.rs does not check for Ipv4Addr::UNSPECIFIED 0.0.0.0. An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the SSRF protection introduced by the fix for CVE-2025-25194 GHSA-7723-35v7-qcxw,...

Activitypub-Federation has SSRF via 0.0.0.0 bypass in activitypub-federation-rust v4_is_invalid()

Summary The v4isinvalid function in activitypub-federation-rust src/utils.rs does not check for Ipv4Addr::UNSPECIFIED 0.0.0.0. An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the SSRF protection introduced by the fix for CVE-2025-25194 GHSA-7723-35v7-qcxw,...

Activitypub-Federation has SSRF via 0.0.0.0 bypass in activitypub-federation-rust v4_is_invalid()

The v4isinvalid function in activitypub-federation-rust src/utils.rs does not check for Ipv4Addr::UNSPECIFIED 0.0.0.0. An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the SSRF protection introduced by the fix for CVE-2025-25194 GHSA-7723-35v7-qcxw, and reac...

📄 activitypub-federation-rust 0.7.1 Server-Side Request Forgery

activitypub-federation-rust versions 0.7.1 and below suffer from a server-side request forgery vulnerability. CVE-2026-33693: SSRF via 0.0.0.0 Bypass in activitypub-federation-rust v4isinvalid CVSS 6.5 Moderate Keywords: SSRF, 0.0.0.0, IP validation bypass, activitypub-federation, Lemmy, Rust,...

CVE-2026-29178

Lemmy, a link aggregator and forum for the fediverse, is vulnerable to server-side request forgery via a dependency on activitypubfederation, 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...

CVE-2026-29178 Lemmy: Unauthenticated SSRF via file_type query parameter injection in image endpoint

Lemmy, a link aggregator and forum for the fediverse, is vulnerable to server-side request forgery via a dependency on activitypubfederation, 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...

EUVD-2025-4082

Malicious code in bioql PyPI...

CVE-2025-53941

Hollo is a federated single-user microblogging software designed to be federated through ActivityPub. Versions prior to 0.6.5 allow HTML form elements to be submitted, making the software vulnerable to HTML injection. Version 0.6.5 fixes the issue...

CVE-2025-53941

Hollo is a federated single-user microblogging software designed to be federated through ActivityPub. Versions prior to 0.6.5 allow HTML form elements to be submitted, making the software vulnerable to HTML injection. Version 0.6.5 fixes the issue...