Bug 2461602 (CVE-2026-41898)

Summary:	CVE-2026-41898 rust-openssl: rust-openssl: Buffer overflow via improper callback return size validation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in rust-openssl, a library providing OpenSSL bindings for the Rust programming language. Foreign Function Interface (FFI) trampolines in several `SslContextBuilder` callbacks did not properly validate the size of data returned by user-defined closures before passing it to OpenSSL. This improper validation could lead to buffer overflows, potentially allowing a remote attacker to achieve arbitrary code execution or cause a denial of service.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2461789, 2461790
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Description OSIDB Bzimport 2026-04-24 18:01:42 UTC

rust-openssl provides OpenSSL bindings for the Rust programming language.  From 0.9.24 to before 0.10.78, the FFI trampolines behind SslContextBuilder::set_psk_client_callback, set_psk_server_callback, set_cookie_generate_cb, and set_stateless_cookie_generate_cb forwarded the user closure's returned usize directly to OpenSSL without checking it against the &mut [u8] that was handed to the closure. This can lead to buffer overflows and other unintended consequences. This vulnerability is fixed in 0.10.78.