EUVD-2026-77330
GHSA-xf89-37qr-gchh
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
ASCII auth must be explicitly enabled via non-default `-Y` flag (AC:H); impact is DoS-only with no confidentiality or integrity compromise.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
6DescriptionCVE.org
A security flaw has been discovered in memcached 1.6.41/1.6.42/1.6.43. This vulnerability affects the function try_read_command_asciiauth of the file proto_text.c of the component mcmc Tokenizer. The manipulation results in out-of-bounds read. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. Upgrading to version 1.6.44 is able to resolve this issue. The patch is identified as af05c9302bba508b736c3da1d5670f63fe8b7db4. You should upgrade the affected component.
AnalysisAI
Out-of-bounds read in memcached versions 1.6.41-1.6.43 allows a remote, unauthenticated attacker to crash the ASCII authentication handler by sending an empty or undersized authentication request line to the mcmc tokenizer. The vulnerability resides in try_read_command_asciiauth() within proto_text.c and results in a low-severity availability impact with no confirmed confidentiality or integrity exposure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires memcached to be started with the `-Y <authfile>` command-line flag, which enables ASCII protocol authentication - this is a non-default configuration absent from standard package manager deployments. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N) scores 6.9 and accurately characterizes this as a remote, low-complexity DoS with no confidentiality or integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade memcached to version 1.6.44, available at the official GitHub release page (https://github.com/memcached/memcached/releases/tag/1.6.44). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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