DEBIAN-CVE-2026-29013

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Source
https://security-tracker.debian.org/tracker/CVE-2026-29013
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-29013.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-29013
Upstream
Published
2026-04-17T22:16:31Z
Modified
2026-09-14T17:03:25Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc() in src/oscore/oscore_cbor.c relies solely on assert() for bounds checking, which is removed in release builds compiled with NDEBUG. Attackers can send crafted CoAP requests with malformed OSCORE options or responses during OSCORE negotiation to trigger out-of-bounds reads during CBOR parsing and potentially cause out-of-bounds reads through integer wraparound in allocation size computation.

References

Affected packages

Debian:12 / libcoap3

Package

Name
libcoap3
Purl
pkg:deb/debian/libcoap3?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.3.1-1
4.3.1-2
4.3.3-1
4.3.4-1
4.3.4-1.1~exp1
4.3.4-1.1
4.3.5-1
4.3.5-2
4.3.5-3
4.3.5-4

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-29013.json"

Debian:13 / libcoap3

Package

Name
libcoap3
Purl
pkg:deb/debian/libcoap3?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.3.4-1.1+deb13u3

Affected versions

4.*
4.3.4-1.1
4.3.4-1.1+deb13u1
4.3.4-1.1+deb13u2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-29013.json"

Debian:14 / libcoap3

Package

Name
libcoap3
Purl
pkg:deb/debian/libcoap3?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.3.5-3

Affected versions

4.*
4.3.4-1.1
4.3.5-1
4.3.5-2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-29013.json"