CVE-2026-57435: Nokogiri: Possible Use-After-Free when setting an attribute value via `Nokogiri::XML::Attr#value=` or `#content=`
CSIRTS triage
- What
- Possible Use-After-Free when setting an attribute value via Nokogiri methods.
- Who is affected
- Users of the Nokogiri library in Ruby applications.
- Urgency
- Remediation is high urgency due to the high severity and lack of exploitation status.
- Action
- Update to the latest version of Nokogiri.
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-2026-57435
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-2026-574350.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-57435 | coverage & exploitation status | NVD · CVE.org |