CVE-2026-43970: Decompression Bomb in cow_spdy:inflate/2 Allows Memory Exhaustion via Crafted SPDY Frame
CSIRTS triage
- What
- A decompression bomb vulnerability in cow_spdy's SPDY frame inflation allows memory exhaustion via malformed frames.
- Who is affected
- Applications using cow_spdy library to process untrusted SPDY frames.
- Urgency
- High priority; memory exhaustion denial-of-service can crash applications processing hostile input.
- Action
- Update cow_spdy library to patched version with decompression size limits.
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-2026-43970
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-2026-439700.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-43970 | coverage & exploitation status | NVD · CVE.org |
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