Out-of-bounds Write Affecting openssl package, versions [3.4.0,3.4.8)[3.5.0,3.5.9)[3.6.0,3.6.5)[4.0.1,4.0.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-CONAN-OPENSSL-20536989
- published6 Oct 2026
- disclosed29 Sept 2026
- creditFilipe Casal,Brandon Luo,Luigino Camastra,Bhargava Shastry
Introduced: 29 Sep 2026
NewCVE-2026-72897 (opens in a new tab)How to fix?
Upgrade openssl to version 3.4.8, 3.5.9, 3.6.5, 4.0.3 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write in the handling of SSL_set_SSL_CTX() called mid handshake, which switches the context without refreshing the recorded certificate slot count, so a replacement context recognizing more provider signature algorithms indexes past the end of the internal array. An attacker can cause small out of bounds reads and writes of fixed values on the server heap, and crash the process, by presenting peer signature algorithms that fall in the excess slots. This requires the application to switch contexts during the handshake between contexts whose provider algorithm advertisements differ, such as ones built on separate library contexts, and only provider algorithms occupying the excess slots are reachable.