{"answers":{"affected":"3 open source packages ship an affected version, including github.com/edgelesssys/contrast.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100836 exists.","fix":"Upgrade github.com/edgelesssys/contrast to 1.21.0 or later.","what":"CVE-2026-100836 is a medium-severity denial of service vulnerability in edgelesssys contrast, published on 27 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-100836 and fix it if it is affected.\n\nWhat it is: CVE-2026-100836 is a medium-severity denial of service vulnerability in edgelesssys contrast, published on 27 Sep 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-2026-100836 exists.\n\nAffected packages and fixed versions:\n- github.com/edgelesssys/contrast (Go): affected all versions; fixed in 1.21.0\n- github.com/edgelesssys/contrast (Go): affected all versions; fixed in 1.21.0\n- github.com/edgelesssys/contrast (Go): affected all versions; fixed in 1.21.0\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-2026-100836/ (Markdown: https://insights.sbomify.com/CVE-2026-100836/index.md)","id":"CVE-2026-100836","markdown":"https://insights.sbomify.com/CVE-2026-100836/index.md","name":"CVE-2026-100836","record":{"aliases":["GHSA-3ccm-4qq2-5wrp","GHSA-x66w-59x9-vvcf","GO-2026-5864"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Contrast mesh service","requires_auth":"low_privilege","summary":"Authenticated attackers can trigger a runtime panic in the transit-engine endpoint by submitting malformed ciphertext, causing service disruption.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-129","name":"Improper Validation of Array Index"}],"description":"Contrast through 1.20.0 contains a panic vulnerability in the transit-engine endpoint's ciphertextContainer.UnmarshalJSON function that fails to validate decoded ciphertext length before slicing. An authenticated workload with a valid mesh certificate can trigger a runtime panic by submitting a short base64-encoded ciphertext, causing log spam and request failures without crashing the process.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer","id":"CVE-2026-100836","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"Edgeless Systems Contrast through 1.20.0 Credential Leak via Registry Suffix Matching","id":"CVE-2026-100837"},"packages":[{"ecosystem":"Go","fixed":["1.21.0"],"introduced":["0"],"last_affected":[],"package":"github.com/edgelesssys/contrast","purl":null,"source":"GHSA-3ccm-4qq2-5wrp"},{"ecosystem":"Go","fixed":["1.21.0"],"introduced":["0"],"last_affected":[],"package":"github.com/edgelesssys/contrast","purl":"pkg:golang/github.com/edgelesssys/contrast","source":"GHSA-3ccm-4qq2-5wrp"},{"ecosystem":"Go","fixed":["1.21.0"],"introduced":["0"],"last_affected":[],"package":"github.com/edgelesssys/contrast","purl":"pkg:golang/github.com/edgelesssys/contrast","source":"GO-2026-5864"}],"prev":{"headline":"Contrast before 1.16.0 Remote Attestation Relay Attack","id":"CVE-2026-100835"},"products":["contrast"],"published":"2026-09-27","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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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":"2026-09-28","vendors":["edgelesssys"]},"summary":"Authenticated attackers can trigger a runtime panic in the transit-engine endpoint by submitting malformed ciphertext, causing service disruption.","url":"https://insights.sbomify.com/CVE-2026-100836/"}