Kiota is an OpenAPI based HTTP Client code generator. From 0.5.0 until 1.35.0, Kiota's Java and PHP documentation-comment sanitizers delete block-comment terminators rather than neutralizing them, allowing overlapping characters to reform a terminator and place attacker-controlled OpenAPI text outside a generated documentation comment. The Java sanitizer also removes non-ASCII characters after deleting terminators, which can create a new terminator during normalization. Exploitation requires a developer or build pipeline to generate source from the malicious description and then compile and load the Java output or load the PHP output, after which injected code executes in the consuming application or build environment context. The version range is based on the Java defect and does not assert that PHP generation existed in every affected release. This issue is fixed in version 1.35.0.
CVE-2026-105796
This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 8.8
- EG Score
- 8.8HIGHlow confidence
- EG Risk
- 44EG Risk 44/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity88% × 45%Exploitation0% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
October 6, 2026
Last Modified
October 6, 2026
Advisory Details (4)
Auto-updated Oct 6, 2026v1.35.0
Patch available: microsoft/kiota v1.35.0
https://github.com/microsoft/kiota/releases/tag/v1.35.0commit 68f33b865be9 (microsoft/kiota)
Fix landed in microsoft/kiota commit 68f33b865be9 — awaiting tagged release
https://github.com/microsoft/kiota/commit/68f33b865be9273464a6efbbe17379760e51f1a4fix(java,php): neutralize doc-comment delimiters instead of deleting them
Fix merged in microsoft/kiota PR #8017 on 2026-08-10 — awaiting tagged release
https://github.com/microsoft/kiota/pull/8017Code injection through doc-comment delimiter reformation in Kiota Java and PHP generators · Advisory · microsoft/kiota · GitHub
https://github.com/microsoft/kiota/security/advisories/GHSA-rm89-rhwj-9j92Vendor Advisories for CVE-2026-105796(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(2 across 1 ecosystem)
NuGet(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| Microsoft.OpenApi.Kiota | 0.10.0-preview ... 1.9.1 (70 versions) |
| — |
| Microsoft.OpenApi.Kiota.Builder | 0.5.1-preview ... 1.9.1 (42 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-06 15:27 UTCEG score recompute
- 2026-10-06 14:30 UTCEG score recompute
- 2026-10-06 14:29 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Same product
10 shownNuGet:Microsoft.OpenApi.Kiota.Builder
Frequently asked(4)
What is CVE-2026-105796?
When was CVE-2026-105796 disclosed?
What is the CVSS score of CVE-2026-105796?
How do I remediate CVE-2026-105796?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-105796
Is Your Infrastructure Affected by CVE-2026-105796?
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