CVE-2026-55209 resdata - Buffer Overflow

resdata < 6.2.9 contains a buffer overflow and out-of-bounds read caused by insufficient validation of numeric fields and array indexes in GRDECL file parsing, letting remote attackers cause memory corruption or denial of service, exploit requires untrusted GRDECL file input.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.78% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service, Out Of Bounds Rw
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-120

Vendor fix

Update to version 6.2.9 or later.

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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