CVE-2026-42462 Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its...

CVE-2026-42462 Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its...

CVE-2026-42462

CVE-2026-42462 describes an LD-Signature bypass in Fedify caused by JSON-LD named-graph restructuring. The issue allows an attacker to reorganize a signed JSON-LD payload (via features like @graph, @reverse, @included) in a way that changes how the signed ActivityPub activity is interpreted witho...

EUVD-2026-36127

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its...

CVE-2026-9309

Firefox for iOS Reader View did not properly escape HTML tags in JSON-LD metadata. A malicious page could inject markup that changed Reader View behavior and leaked sensitive URL parameters. These parameters could then be used to access internal pages, potentially resulting in arbitrary JavaScrip...

CVE-2026-9308

Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. This vulnerability was...

CVE-2026-9309

Firefox for iOS Reader View did not properly escape HTML tags in JSON-LD metadata. A malicious page could inject markup that changed Reader View behavior and leaked sensitive URL parameters. These parameters could then be used to access internal pages, potentially resulting in arbitrary JavaScrip...

CVE-2026-9309 Arbitrary JavaScript execution in internal pages via Reader View JSON-LD injection

Firefox for iOS Reader View did not properly escape HTML tags in JSON-LD metadata. A malicious page could inject markup that changed Reader View behavior and leaked sensitive URL parameters. These parameters could then be used to access internal pages, potentially resulting in arbitrary JavaScrip...

EUVD-2026-33629

Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. This vulnerability was...

CVE-2026-9308

Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. This vulnerability was...

Security Vulnerabilities fixed in Firefox for iOS 151.2 — Mozilla

Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. Firefox for iOS Reader Vi...

PT-2026-45410

Name of the Vulnerable Software and Affected Versions Firefox for iOS versions prior to 151.2 Description Reader View in Firefox for iOS replaced page content in its HTML template before substituting other internal placeholders. A malicious page could include a placeholder string that was...

CVE-2026-42328

go-ipld-prime is an implementation of the InterPlanetary Linked Data IPLD spec interfaces, a batteries-included codec implementations of IPLD for CBOR and JSON, and tooling for basic operations on IPLD objects. Prior to 0.23.0, the DAG-CBOR and DAG-JSON decoders recurse on each nested map or list...

Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring

As told on Discord earlier, multiple projects are affected, and we would like to coordinate. For now, we are aiming at a May 6th release date, but this is not set in stone yet. Summary An attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify...

GHSA-9RFG-V8G9-9367 Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring

As told on Discord earlier, multiple projects are affected, and we would like to coordinate. For now, we are aiming at a May 6th release date, but this is not set in stone yet. Summary An attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify...

PT-2026-43443

Name of the Vulnerable Software and Affected Versions Fedify versions prior to 1.9.11 Fedify versions prior to 1.10.10 Fedify versions prior to 2.0.18 Fedify versions prior to 2.1.14 Fedify versions prior to 2.2.3 Description An attacker can utilize JSON-LD features to restructure a JSON-LD...

OT Cybersecurity Challenges for ICS in 2026

OT Cybersecurity Challenges for ICS in 2026 OT cybersecurity has become a board-level risk because industrial control systems are no longer isolated, predictable, or invisible to attackers. In 2026, security teams protecting manufacturing plants, utilities, transportation systems, energy...

CVE-2026-35480

go-ipld-prime is an implementation of the InterPlanetary Linked Data IPLD spec interfaces, a batteries-included codec implementations of IPLD for CBOR and JSON, and tooling for basic operations on IPLD objects. Prior to 0.22.0, the DAG-CBOR decoder uses collection sizes declared in CBOR headers a...

ANT-2026-P2DWB2SK · mastodon · Signature-bypass

signature-bypass high GHSA-chgx-jx3p-rf73 Severity Claude high · Security research firm high · Maintainer unknown Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Doyensec. ANT-2026-P2DWB2SK: LD-Signature bypass via...

CVE-2023-49820

Improper Neutralization of Input During Web Page Generation 'Cross-site Scripting' vulnerability in Gordon Böhme, Antonio Leutsch Structured Content JSON-LD wpsc allows Stored XSS.This issue affects Structured Content JSON-LD wpsc: from n/a through 1.5.3...