Microsoft · crypto: af_alg - limit RX SG extraction by receive buffer budget
Affects MicrosoftSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 06:26 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 2 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Security Response Center Microsoft | Affected
| Fixed in– |
Description
CVE-2026-31677 is a vulnerability related to the crypto subsystem, specifically the af_alg component, involving the limitation of RX scatter-gather (SG) extraction by the receive buffer budget. The vulnerability affects Microsoft product version 3.0. No detailed technical or impact information is provided beyond this. There is no CVSS score or known exploits in the wild at this time.