CVE-2026-115505: high-severity vulnerability in sahlberg libsmb2
libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum
Published
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 7.2epss 0.2%
exploitation probability
0.2%top 89% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
libsmb2 before 6.3 contains integer overflow vulnerabilities in the DCE/RPC NDR decoder in lib/dcerpc.c that allow heap out-of-bounds reads and writes. A malicious SMB server or machine-in-the-middle on unsigned connections can send crafted NetrShareEnum replies with wrapping actual_count or max_count values when clients call smb2_share_enum_async(), corrupting heap memory.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Affected products
sahlberg · libsmb2public PoCs found — 1
cve_referencehackmd.io/@haindpwn/libsmb2-dcerpc-ndr-count-overflow-oobunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — sahlberg libsmb2
In the same product, most dangerous first.
CVE-2026-110714HIGHlibsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer UnderflowEPSS 0.5%CVE-2026-110713HIGHlibsmb2 through 6.2 Heap Out-of-Bounds Read via File System Info DecodersEPSS 0.5%CVE-2026-110712HIGHlibsmb2 through 6.2 Heap Out-of-Bounds Read via smb2_decode_file_all_infoEPSS 0.4%
References
https://github.com/sahlberg/libsmb2https://github.com/sahlberg/libsmb2/commit/a79f6914cb5ed3f74293d15cdea901261ce179ffhttps://github.com/sahlberg/libsmb2/issues/496https://github.com/sahlberg/libsmb2/releases/tag/libsmb2-6.3https://hackmd.io/@haindpwn/libsmb2-dcerpc-ndr-count-overflow-oobhttps://www.vulncheck.com/advisories/libsmb2-before-6.3-integer-overflow-in-dce-rpc-ndr-decoder-via-netrshareenum