DEBIAN-CVE-2026-29013: libcoap3 security update

DEBIAN-CVE-2026-29013, released May 15, 2026, fixes 1 CVE in libcoap3. None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0030

22nd percentile

Fixed package versions

Product	Release	Fixed in
libcoap3	Debian 13.5 (trixie)	4.3.4-1.1+deb13u3
libcoap3	Debian 14	4.3.5-3

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-29013	libcoap3: libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc()...	9.8	0.0030	None reported

Also fixes CVE-2026-29013

FEDORA-2026-0CE923A09D
libcoap, libcoap-debuginfo, libcoap-debugsource and 4 more on Fedora 43

Vendor advisory

https://security-tracker.debian.org/tracker/CVE-2026-29013

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