{"answers":{"affected":"2 open source packages ship an affected version, including @sigstore/core.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48758 exists.","fix":"Upgrade @sigstore/core to 3.2.1 or later.","what":"CVE-2026-48758 is a medium-severity vulnerability in sigstore-js, published on 14 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-48758 and fix it if it is affected.\n\nWhat it is: CVE-2026-48758 is a medium-severity vulnerability in sigstore-js, published on 14 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48758 exists.\n\nAffected packages and fixed versions:\n- @sigstore/core (npm): affected all versions; fixed in 3.2.1\n- @sigstore/core (npm): affected all versions; fixed in 3.2.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-48758/ (Markdown: https://insights.sbomify.com/CVE-2026-48758/index.md)","id":"CVE-2026-48758","markdown":"https://insights.sbomify.com/CVE-2026-48758/index.md","name":"CVE-2026-48758","record":{"aliases":["CLEANSTART-2026-BS35481","CLEANSTART-2026-FS67325","CLSA-2026-1790597352","CLSA-2026-1792603628","CLSA-2026-1793143332","GHSA-jfc7-64v2-mr8c","MINI-2whv-4pg9-mw2p","MINI-4jxj-935j-329c","MINI-5p8x-5h8x-ghgh","MINI-5wp8-c9f4-958h","MINI-mxqg-qgvj-79qp","MINI-p84j-66f7-j9hq","MINI-rx25-x2r2-rrxj","ROOT-APP-NPM-CVE-2026-48758"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript signing library","requires_auth":"low_privilege","summary":"Attackers can mutate payload types after signing without invalidating signatures, breaking DSSE type-binding guarantees in sigstore-js.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"description":"sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2.1, the preAuthEncoding function in @sigstore/core uses Node.js ascii encoding when converting the PAE string to bytes, allowing payloadType to be mutated after signing without invalidating the signature and breaking the type-binding guarantee that DSSE is designed to provide. This issue is fixed in version 3.2.1.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"sigstore-js: DSSE payloadType type-binding failure","id":"CVE-2026-48758","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"other","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"TypeBot: Cross-Workspace Theme Template IDOR (Modification and Deletion)","id":"CVE-2026-48759"},"packages":[{"ecosystem":"npm","fixed":["3.2.1"],"introduced":["0"],"last_affected":[],"package":"@sigstore/core","purl":null,"source":"GHSA-jfc7-64v2-mr8c"},{"ecosystem":"npm","fixed":["3.2.1"],"introduced":["0"],"last_affected":[],"package":"@sigstore/core","purl":"pkg:npm/%40sigstore/core","source":"GHSA-jfc7-64v2-mr8c"}],"prev":{"headline":"Incus: CreateCustomVolumeFromBackup nil-pointer dereference on volume_snapshots[*].expires_at (sibling-field variant of GHSA-r7w7)","id":"CVE-2026-48756"},"products":["sigstore-js"],"published":"2026-07-14","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-15","vendors":["sigstore"]},"summary":"Attackers can mutate payload types after signing without invalidating signatures, breaking DSSE type-binding guarantees in sigstore-js.","url":"https://insights.sbomify.com/CVE-2026-48758/"}