CVE-2026-5260
Remote heap overread in libgnutls during RSA TLS handshake with PKCS#11-backed keys.
Is CVE-2026-5260 being exploited?
Not confirmed. CVE-2026-5260 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.73% probability of exploitation in the next 30 days.
How severe is CVE-2026-5260?
CVE-2026-5260 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-5260?
Yes. A fix has been recorded for CVE-2026-5260. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-5260 affect?
CVE-2026-5260 affects libgnutls TLS library, Servers/apps using libgnutls with PKCS#11 RSA keys. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-5260?
Upgrade to patched libgnutls when available
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Info disclosure via remote heap overread during TLS RSA exchange with PKCS#11-backed keys.
Patch when possible