Linux · 
Debian · Security advisory · April 16, 2026
Debian · Security advisory · April 16, 2026DEBIAN-CVE-2026-6409: protobuf security update
DEBIAN-CVE-2026-6409, released April 16, 2026, fixes 1 CVE in protobuf. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
1
None rated Critical
Exploited
0
None reported
Highest CVSS
n/a
No CVSS score published
Highest EPSS
0.0036
29th percentile
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| protobuf | Debian 12.15 (bookworm) | 3.21.12-3+deb12u1 |
| protobuf | Debian 13.5 (trixie) | 3.21.12-11+deb13u1 |
| protobuf | Debian 14 | 3.21.12-16 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2026-6409 | Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input | n/a | 0.0036 | None reported |
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