{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100891 exists.","fix":"No fix has been published for CVE-2026-100891 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-100891 is a medium-severity vulnerability in Trusted Domain Project OpenDMARC, published on 28 Sep 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-2026-100891 and fix it if it is affected.\n\nWhat it is: CVE-2026-100891 is a medium-severity vulnerability in Trusted Domain Project OpenDMARC, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100891 exists.\n\nAffected product: Trusted Domain Project OpenDMARC. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-100891/ (Markdown: https://insights.sbomify.com/CVE-2026-100891/index.md)","id":"CVE-2026-100891","markdown":"https://insights.sbomify.com/CVE-2026-100891/index.md","name":"CVE-2026-100891","record":{"aliases":["DEBIAN-CVE-2026-100891","GHSA-h88r-m2wp-c7v2","UBUNTU-CVE-2026-100891"],"analysis":{"component_type":"server_software","fix_type":"no_fix_stated","impacts":["other"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenDMARC mail filter","requires_auth":"none","summary":"An encoding error in OpenDMARC's IDN handler allows remote attackers to trigger issues, though specific impact details are limited.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulDB","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-172","name":"Improper Encoding or Decoding of Data"}],"description":"A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is the function opendmarc_policy_query_dmarc in the library libopendmarc/opendmarc_policy.c of the component Internationalized Domain Name Handler. Such manipulation leads to encoding error. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"Other in OpenDMARC","id":"CVE-2026-100891","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"aligungr UERANSIM nr-gnb handler.cpp ULInformationTransfer memory corruption","id":"CVE-2026-100892"},"packages":[],"prev":{"headline":"Trusted Domain Project OpenDMARC SPF Parser opendmarc_spf.c opendmarc_spf_ipv6_explode null pointer dereference","id":"CVE-2026-100890"},"products":["OpenDMARC"],"published":"2026-09-28","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-01","vendors":["Trusted Domain Project"]},"summary":"An encoding error in OpenDMARC's IDN handler allows remote attackers to trigger issues, though specific impact details are limited.","url":"https://insights.sbomify.com/CVE-2026-100891/"}