CVE-2026-123379
A NVD · · CVE-2026-123379
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- CVSS
- 7.5
- EPSS
- 0%
Key insight
The report only provides the CVE description; there are no indications of active exploitation, affected sectors, or TTPs.
Description
CVE-2026-123379 describes a heap-based buffer overflow in Microsoft Office Outlook. An unauthenticated attacker can execute code over the network when an affected Outlook instance processes crafted input. The report does not provide information on exploitation in the wild, proof-of-concept code, or KEV inclusion. Systems with vulnerable Outlook versions are affected; details on fixes or attack preconditions are not provided.
Risk score
- cvss base
- 75.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 0.00
- raw before weight
- 75.00
- industry weight
- 1.21
- freshness factor
- 1.00
- exploitability factor
- 1.00
- days old
- 0.00
- vendor mismatch penalty
- 0.00
Path: operational