CVE-2026-72897 OpenSSL - Out-of-Bounds Read & Write

OpenSSL TLS server contains an out-of-bounds read and write caused by calling SSL_set_SSL_CTX() to switch SSL_CTX during handshake without refreshing internal array size, letting remote peers cause heap corruption and denial of service, exploit requires use of different SSL_CTX with more provider signature algorithms.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.27% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out-of-Bounds Read
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest OpenSSL version where this issue is fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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