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CVE-2025-59391

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap...

6.5 MediumFix available

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
Low

Exploit likelihood

0.26%Up 0.2 points since Dec 9, 2025
90%50%10%1%

What each source reports

CVE List Score used 6.5

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Record
CVE-2025-59391
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-125
Updated
2026-11-02
EUVDEUVD-2025-201786 6.5

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Record
EUVD-2025-201786
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-7v9m-g6fx-mq4f 6.5

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap...

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Record
GHSA-7v9m-g6fx-mq4f
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-125
Updated
2026-11-02
NVD 6.5

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Record
CVE-2025-59391
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-125
Updated
2026-11-02
OSV 6.5

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Record
CVE-2025-59391
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVDEBIAN-CVE-2025-59391 6.5

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Record
DEBIAN-CVE-2025-59391
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2025-59391 6.5

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

Record
UBUNTU-CVE-2025-59391
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libcoap3
Debian:12
All versions, plus listed versions
4.3.1-14.3.1-24.3.3-14.3.4-14.3.4-1.1
Show 5 moreShow less
4.3.4-1.1~exp14.3.5-14.3.5-24.3.5-34.3.5-4
None known
libcoap3
Debian:13
before 4.3.4-1.1+deb13u2, plus listed versions
4.3.4-1.14.3.4-1.1+deb13u1
4.3.4-1.1+deb13u2
libcoap3
Debian:14
before 4.3.5-2, plus listed versions
4.3.4-1.14.3.5-1
4.3.5-2
libcoap
Ubuntu:18.04:LTS
All versions, plus listed versions
4.1.2-1
None known
libcoap2
Ubuntu:20.04:LTS
All versions, plus listed versions
4.2.0-24.2.1-1
None known
libcoap2
Ubuntu:22.04:LTS
All versions, plus listed versions
4.2.1-14.2.1-1build1
None known
libcoap3
Ubuntu:22.04:LTS
All versions, plus listed versions
4.3.0-24.3.0-2build1
None known
libcoap3
Ubuntu:24.04:LTS
All versions, plus listed versions
4.3.1-24.3.3-14.3.4-14.3.4-1.1build24.3.4-1.1build34.3.4-1.1build4
None known
libcoap3
Ubuntu:25.10
All versions, plus listed versions
4.3.4-1.1build4
None known
libcoap3
Ubuntu:26.10
All versions, plus listed versions
4.3.5-24.3.5-34.3.5-44.3.5-4ubuntu1
None known
libcoap3
Ubuntu:26.04:LTS
All versions, plus listed versions
4.3.4-1.1build44.3.5-14.3.5-2
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-59391 is a medium vulnerability (CVSS 6.5) in Libcoap, published December 8, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 17th percentile. Fixed in libcoap3 4.3.4-1.1+deb13u2.

References

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