{"answers":{"affected":"3 open source packages ship an affected version, including github.com/theupdateframework/go-tuf/v2. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-23991 in the wild and no public exploit code.","fix":"Upgrade github.com/theupdateframework/go-tuf/v2 to 2.3.1 or later.","what":"CVE-2026-23991 is a medium-severity denial of service vulnerability in theupdateframework go-tuf, published on 22 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-23991 and fix it if it is affected.\n\nWhat it is: CVE-2026-23991 is a medium-severity denial of service vulnerability in theupdateframework go-tuf, published on 22 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-23991 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/theupdateframework/go-tuf/v2 (Go): affected all versions; fixed in 2.3.1\n- github.com/theupdateframework/go-tuf/v2 (Go): affected all versions; fixed in 2.3.1\n- github.com/theupdateframework/go-tuf/v2 (Go): affected all versions; fixed in 2.3.1\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-2026-23991/ (Markdown: https://insights.sbomify.com/CVE-2026-23991/index.md)","id":"CVE-2026-23991","markdown":"https://insights.sbomify.com/CVE-2026-23991/index.md","name":"CVE-2026-23991","record":{"aliases":["AZL-75186","BELL-CVE-2026-23991","CLEANSTART-2026-HN41905","CLEANSTART-2026-JT87240","DEBIAN-CVE-2026-23991","GHSA-846p-jg2w-w324","GO-2026-4348","MINI-26c5-jcfv-9rrq","MINI-26wr-jqrq-5hh3","MINI-274m-48g4-j6v6","MINI-2jqm-9484-fhwj","MINI-2p8q-r2xv-9hx2","MINI-4pq7-x526-89fg","MINI-4v3q-phqf-gr2w","MINI-4wj8-f3q4-94x3","MINI-5wj6-p26m-h8c5","MINI-62qw-pqr7-3cj9","MINI-7c9j-jq68-4mf8","MINI-7q6q-fpxh-3f7h","MINI-85q8-8m34-hv3c","MINI-8h92-gpcg-8j4j","MINI-8jfx-r2rh-2gxx","MINI-8m9f-rq4f-cpgc","MINI-c69f-6rc6-6599","MINI-ccmf-j8qx-3xgg","MINI-cp7w-mjpv-2xxx","MINI-f2pr-wc8g-83p9","MINI-f676-96g2-rxq9","MINI-hjrp-ww3c-cqwj","MINI-j2rw-8whr-mvgq","MINI-jpxx-4h74-jhfv","MINI-mw53-j3fm-pg64","MINI-q8ff-7xj4-xmvf","MINI-qj86-7rv3-p92q","MINI-qp9w-mcp4-394m","MINI-rgwh-px29-7mfj","MINI-v3pq-h3c7-jx7x","MINI-vprc-h95p-vj8q","MINI-wr7v-hh2x-m556","MINI-x5jp-64jq-r5x5","UBUNTU-CVE-2026-23991"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Go TUF library","requires_auth":"none","summary":"A compromised TUF repository can cause a denial of service in go-tuf clients by sending malformed metadata that triggers a panic before signature validation.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"go-tuf","vendor":"theupdateframework"}],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-754","name":"Improper Check for Unusual or Exceptional Conditions"},{"id":"CWE-617","name":"Reachable Assertion"}],"description":"go-tuf is a Go implementation of The Update Framework (TUF). Starting in version 2.0.0 and prior to version 2.3.1, if the TUF repository (or any of its mirrors) returns invalid TUF metadata JSON (valid JSON but not well formed TUF metadata), the client will panic during parsing, causing a denial of service. The panic happens before any signature is validated. This means that a compromised repository/mirror/cache can DoS clients without having access to any signing key. Version 2.3.1 fixes the issue. No known workarounds are available.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"go-tuf affected by client DoS via malformed server response","id":"CVE-2026-23991","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"go-tuf improperly validates the configured threshold for delegations","id":"CVE-2026-23992"},"packages":[{"ecosystem":"Go","fixed":["2.3.1"],"introduced":["0"],"last_affected":[],"package":"github.com/theupdateframework/go-tuf/v2","purl":null,"source":"GHSA-846p-jg2w-w324"},{"ecosystem":"Go","fixed":["2.3.1"],"introduced":["0"],"last_affected":[],"package":"github.com/theupdateframework/go-tuf/v2","purl":"pkg:golang/github.com/theupdateframework/go-tuf/v2","source":"GHSA-846p-jg2w-w324"},{"ecosystem":"Go","fixed":["2.3.1"],"introduced":["0"],"last_affected":[],"package":"github.com/theupdateframework/go-tuf/v2","purl":"pkg:golang/github.com/theupdateframework/go-tuf/v2","source":"GO-2026-4348"}],"prev":{"headline":"Flux Operator Web UI Impersonation Bypass via Empty OIDC Claims","id":"CVE-2026-23990"},"products":["go-tuf"],"published":"2026-01-22","related":[{"cvss_score":8,"headline":"No protection against rollback attacks in go-tuf","id":"CVE-2022-29173","kev_date_added":null,"published":"2022-05-05"},{"cvss_score":5.9,"headline":"go-tuf improperly validates the configured threshold for delegations","id":"CVE-2026-23992","kev_date_added":null,"published":"2026-01-22"},{"cvss_score":4.7,"headline":"go-tuf Path Traversal in TAP 4 Multirepo Client Allows Arbitrary File Write via Malicious Repository Names","id":"CVE-2026-24686","kev_date_added":null,"published":"2026-01-27"}],"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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-22","vendors":["theupdateframework"]},"summary":"A compromised TUF repository can cause a denial of service in go-tuf clients by sending malformed metadata that triggers a panic before signature validation.","url":"https://insights.sbomify.com/CVE-2026-23991/"}