Bug 2548667 (CVE-2026-15340) - CVE-2026-15340 lwip: Savannah lwIP SMTP client Classic Buffer Overflow
Summary: CVE-2026-15340 lwip: Savannah lwIP SMTP client Classic Buffer Overflow
Keywords:
Status: NEW
Alias: CVE-2026-15340
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-09 15:18 UTC by OSIDB Bzimport
Modified: 2026-10-12 13:46 UTC (History)
0 users

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-10-09 15:18:42 UTC 
lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.
Comment 1 Tomas Hoger 2026-10-12 13:35:53 UTC 
CISA ICS advisory page:
https://www.cisa.gov/news-events/ics-advisories/icsa-26-279-02

mentions the fix is available in the upstream commit 614420f82c8729d070e01464c0dddb3c9525c772:
https://cgit.git.savannah.nongnu.org/cgit/lwip.git/commit/?id=614420f82c8729d070e01464c0dddb3c9525c772

This commit references upstream bug report #68313, which is currently not public:
https://savannah.nongnu.org/bugs/?68313
Comment 2 Tomas Hoger 2026-10-12 13:40:31 UTC 
The ocproxy component in Fedora / EPEL claims to bundle lwIP.  However, it does not build smtp.c or any of the lwip/src/apps code, it only builds lwip/src/core, and is therefore not affected by this issue.
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