11 September 2026
Reference: CVE-2026-18924
1. What is being reported?
The flaw involves how libcurl handles a feature called HTTP/2 Server Push when multiple connections are shared. This can cause the software to use memory incorrectly during cleanup, leading to serious security risks like remote code execution without needing to log in.
2. What this means in plain English
If your business uses software that relies on libcurl for internet communication, attackers could exploit this flaw to take control of your systems remotely. This could lead to data theft, disruption of services, or other harmful impacts.
3. Could this affect a small business?
Small businesses using Microsoft products such as Windows, Office, Outlook, or Exchange may be affected, especially if these products use the vulnerable libcurl library. If you use other software or services that rely on libcurl, you should also be cautious. Organisations not using these technologies are less likely to be impacted.
4. What to do now
- Check with your IT provider or software supplier whether your systems use libcurl and are affected by this vulnerability.
- Apply any security updates or patches released for your software immediately.
- Ensure your antivirus and endpoint protection software are up to date and running.
- Monitor your systems for unusual activity and report any suspicious behaviour promptly.
5. Ask your IT provider
Can you confirm if our current software uses libcurl and if it is affected by CVE-2026-18924? Have all necessary patches been applied to protect against this vulnerability?
6. Bottom line
This is a serious security issue that needs prompt attention to keep your business safe from remote attacks.
Information based on CISA KEV, NVD, and reputable security reporting.