UpHeron
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Servers and applications

CVE-2026-31789

Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker can supply a crafted X.509 certificate with an excessively large OCTET STRING value in extensions such…

Severity
Critical 9.8
Published
7 Apr 2026
Last changed
24 Jul 2026
Added to UpHeron
21 Oct 2026
Fixed in
3.0.20, 3.3.7, 3.4.5, 3.5.6, 3.6.2
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSLServers and applications · cpe:a:openssl:openssl
  • From 3.0.0 before 3.0.20
  • From 3.3.0 before 3.3.7
  • From 3.4.0 before 3.4.5
  • From 3.5.0 before 3.5.6
  • From 3.6.0 before 3.6.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-31789
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31789