{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-18355 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-18355 is a high-severity memory corruption vulnerability in Red Hat Directory Server 11.5 E4S for RHEL 8, published on 7 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-2026-18355 and fix it if it is affected.\n\nWhat it is: CVE-2026-18355 is a high-severity memory corruption vulnerability in Red Hat Directory Server 11.5 E4S for RHEL 8, published on 7 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-18355 in the wild and no public exploit code.\n\nAffected product: Red Hat Directory Server 11.5 E4S for RHEL 8. 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-2026-18355/ (Markdown: https://insights.sbomify.com/CVE-2026-18355/index.md)","id":"CVE-2026-18355","markdown":"https://insights.sbomify.com/CVE-2026-18355/index.md","name":"CVE-2026-18355","record":{"aliases":["AZL-99980","DEBIAN-CVE-2026-18355","GHSA-r5vv-79fp-2427","UBUNTU-CVE-2026-18355"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service","code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"389 Directory Server","requires_auth":"low_privilege","summary":"Remote authenticated attackers can trigger a heap buffer overflow in 389 Directory Server via SASL integrity protection, leading to denial of service or code execution.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-191","name":"Integer Underflow (Wrap or Wraparound)"}],"description":"A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), the wrapped-record length read from the wire is validated only against an upper bound. A small wire length (0, 1, or 2) produces an encrypted_buffer_count below the already-consumed encrypted_buffer_offset, causing an unsigned subtraction underflow in sasl_io_read_packet(). PR_Recv is then requested to read approximately 4 GiB into a 1024-byte heap buffer, resulting in a heap buffer overflow with attacker-controlled content. After a successful SASL bind with integrity protection (SSF \u003e 0), a remote authenticated attacker can cause a denial of service or potentially achieve remote code execution. This flaw is distinct from CVE-2026-11774, whose fix only guards against upper-bound overflow.","ecosystems":[],"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":"Memory corruption in Red Hat Directory Server 11.5 E4S for RHEL 8","id":"CVE-2026-18355","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":19,"next":{"headline":"Limit Login Attempts Reloaded \u003c 3.3.5 - Username Denylist Bypass via Case Variant and Account Email","id":"CVE-2026-18356"},"packages":[],"prev":{"headline":"Unauthenticated SSRF in PIA via OIDC issuer allowlist bypass","id":"CVE-2026-18353"},"products":["Red Hat Directory Server 11.5 E4S for RHEL 8","Red Hat Directory Server 11.7 E4S for RHEL 8","Red Hat Directory Server 11.9 for RHEL 8","Red Hat Directory Server 12","Red Hat Directory Server 12.2 E4S for RHEL 9","Red Hat Directory Server 12.4 E4S for RHEL 9","Red Hat Directory Server 13","Red Hat Directory Server 13.2","Red Hat Enterprise Linux 10","Red Hat Enterprise Linux 10.0 Extended Update Support","Red Hat Enterprise Linux 6","Red Hat Enterprise Linux 7 Extended Lifecycle Support","Red Hat Enterprise Linux 8","Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support","Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On","Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support","Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On","Red Hat Enterprise Linux 8.8 Telecommunications Update Service","Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions","Red Hat Enterprise Linux 9","Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions","Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions","Red Hat Enterprise Linux 9.6 Extended Update Support"],"published":"2026-09-07","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":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["Red Hat"]},"summary":"Remote authenticated attackers can trigger a heap buffer overflow in 389 Directory Server via SASL integrity protection, leading to denial of service or code execution.","url":"https://insights.sbomify.com/CVE-2026-18355/"}