Grafana OOM from OpenFeature Unbounded Memory Read in Toggle Evaluator
CVE-2026-27880 Published on March 27, 2026
OpenFeature evaluation API reads input data with no bounds
The OpenFeature feature toggle evaluation endpoint reads unbounded values into memory, which can cause out-of-memory crashes.
Weakness Type
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
Products Associated with CVE-2026-27880
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Affected Versions
Grafana:- Version v12.1.0 and below v12.1.10 is affected.
- Version v12.2.0 and below v12.2.8 is affected.
- Version v12.3.0 and below v12.3.6 is affected.
- Version v12.4.0 and below v12.4.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.