CVE-2026-15712: Soupclientmessageiohttp2: libsoup3: libsoup: http/2 goaway frame parsing heap buffer over-read via invalid nul-termination assumption
CSIRTS triage
- What
- A heap buffer over-read occurs during HTTP/2 goaway frame parsing due to an invalid null-termination assumption.
- Who is affected
- Deployments using libsoup3 are affected by this vulnerability.
- Urgency
- This is a medium urgency issue as it may lead to unexpected behavior.
- Action
- Update libsoup to the latest version to mitigate this vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-15712
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-157120.50% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-15712 | coverage & exploitation status | NVD · CVE.org |
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