CVE-2026-63201 - netopeer2-server logging has format string vulnerability via subtree filter

CVE-2026-63201 - netopeer2-server logging has format string vulnerability via subtree filter

https://cvefeed.io/rssfeed/latest.atom / Sat, 10/31/2026 - 01:27
CVE ID :CVE-2026-63201
Published : Oct. 30, 2026, 10:16 p.m. | 1 hour, 7 minutes ago
Description :Netopeer2 is a server for implementing network configuration management based on the `NETCONF` Protocol. In affected versions, a low-privileged authenticated `NETCONF` user can remotely crash `netopeer2-server` by sending a `get RPC` with an invalid `subtree filter` whose text contains format specifiers. In `src/netconf.c`, `np2srv_rpc_get_cb()` sends the invalid value through `ERR()` to `np2log_printf()`, where `vsnprintf()` first formats the message safely. In `src/log.c`, that already formatted buffer is subsequently passed to `np2log()` as the format string itself, causing `vsyslog()` to interpret attacker-controlled percent sequences and read invalid pointer arguments. The reported denial of service was confirmed on version 2.8.7 using `NETCONF`-over-SSH and AddressSanitizer; reliable remote code execution was not confirmed. `The advisory identifies 2.8.8 as patched`; repository comparisons verify the fix in public release 2.8.21. The affected/fixed boundary remains unresolved because no public 2.8.8 tag was located, which does not establish the status of an untagged 2.8.8 build.
Severity: 7.1 | HIGH
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