What’s Vulnerable › Vulnerabilities

CVE-2026-111279: Dragonfly through 2.0.2 Unbounded Memory Allocation via Negative COUNT in HRANDFIELD, ZRANDMEMBER and SRANDMEMBER

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-16
• Weakness: CWE-789

Description

Dragonfly through 2.0.2 contains an unbounded memory allocation vulnerability that allows unauthenticated clients to exhaust memory by passing a negative COUNT to HRANDFIELD, ZRANDMEMBER or SRANDMEMBER. Attackers can send a single command against a one-element key with a huge negative COUNT to trigger the OOM killer, terminating the instance for all clients.

Affected products

• dragonflydb dragonfly: through 2.0.2

References

• https://github.com/dragonflydb/dragonfly
• https://github.com/dragonflydb/dragonfly/blob/8ce4bbb106586057fbd85f71ed353c60d0d5bf87/src/server/hset_family.cc#L1436-L1483
• https://github.com/dragonflydb/dragonfly/blob/8ce4bbb106586057fbd85f71ed353c60d0d5bf87/src/server/set_family.cc#L957-L984
• https://github.com/dragonflydb/dragonfly/blob/8ce4bbb106586057fbd85f71ed353c60d0d5bf87/src/server/zset_family.cc#L1519-L1522
• https://github.com/dragonflydb/dragonfly/issues/8578
• https://www.vulncheck.com/advisories/dragonfly-through-2.0.2-unbounded-memory-allocation-via-negative-count-in-hrandfield-zrandmember-and-srandmember
• https://github.com/dragonflydb/dragonfly/issues/8578

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