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CVE-2026-42462

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 Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a01db98acb4d419025013dedd401189808fc067ea8b3ab11ce78f79b541d6ec7
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 4 assertions

{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-436","description":"CWE-436: Interpretation Conflict","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-1289","description":"CWE-1289: Improper Validation of Unsafe Equivalence in Input","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/problemTypes/3/descriptions/0

{"cweId":"CWE-180","description":"CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"fedify","vendor":"fedify-dev","versions":[{"status":"affected","version":">= 2.2.0, < 2.2.3"},{"status":"affected","version":">= 2.1.0, < 2.1.14"},{"status":"affected","version":">= 2.0.0, < 2.0.18"},{"status":"affected","version":">= 1.10.0, < 1.10.10"},{"status":"affected","version":"< 1.9.11"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

4 source assertions
{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-436","description":"CWE-436: Interpretation Conflict","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-1289","description":"CWE-1289: Improper Validation of Unsafe Equivalence in Input","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/problemTypes/3/descriptions/0
{"cweId":"CWE-180","description":"CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/fedify-dev/fedify/releases/tag/2.2.3","tags":["x_refsource_MISC"],"url":"https://github.com/fedify-dev/fedify/releases/tag/2.2.3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/references/1
{"name":"https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367","tags":["x_refsource_CONFIRM"],"url":"https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:39b063d4acef37b2d083016e999bb13ffd782f8053f9480f0a7a42b214843fd9 · sha256:a04fd6ff52768f56… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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