Buffer overflow in Strophe Libstrophe
CVE-2026-112063
libstrophe through 0.14.0 contains a stack-based buffer overflow vulnerability in SCRAM_Hi that allows malicious XMPP servers to overflow a 128-byte stack buffer by sending an oversized SCRAM salt. Attackers can send a server-first-message whose s= attribute decodes to more than 124 bytes, aborting the client or overwriting stack memory in NDEBUG builds.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haindpwn/libstrophe-scram-salt-stack-overflow (third-party-advisory)
- github.com/strophe/libstrophe/blob/0.14.0/src/scram.c (technical-description)
- github.com/strophe/libstrophe/blob/0.14.0/src/sasl.c (technical-description)
- www.vulncheck.com/advisories/libstrophe-through-0.14.0-stack-based-buffer-overf… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-112063?
- CVE-2026-112063 is a medium-severity vulnerability in Strophe Libstrophe, classified under Stack-based Buffer Overflow. CVSS score: 5.9/10. Published 2026-10-18.
- How severe is CVE-2026-112063?
- Medium severity. CVSS v3 base score is 5.9 out of 10.