CVE-2016-4008
The _asn1_extract_der_octet function in lib/decoding.c in GNU Libtasn1 before 4.8, when used without the ASN1_DECODE_FLAG_STRICT_DER flag, allows remote attackers to cause a denial of service (infinite recursion) via a crafted certificate.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 29.4%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
Description
The _asn1_extract_der_octet function in lib/decoding.c in GNU Libtasn1 before 4.8, when used without the ASN1_DECODE_FLAG_STRICT_DER flag, allows remote attackers to cause a denial of service (infinite recursion) via a crafted certificate.
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 29.40% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-399
- Affected
- canonical/ubuntu linux · opensuse/opensuse · gnu/libtasn1 · fedoraproject/fedora
- Source
- cve@mitre.org
EPSS moved from 29.4% on 3 October 2026 to 29.4% on 4 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://git.savannah.gnu.org/gitweb/?p=libtasn1.git%3Ba=commit%3Bh=a6e0a0b58f5cdaf4e9beca5bce69c09808cbb625
- http://git.savannah.gnu.org/gitweb/?p=libtasn1.git%3Ba=commit%3Bh=f435825c0f527a8e52e6ffbc3ad0bc60531d537e
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182299.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182907.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183221.html
- http://lists.opensuse.org/opensuse-updates/2016-06/msg00047.html
- http://lists.opensuse.org/opensuse-updates/2016-06/msg00097.html
- http://www.debian.org/security/2016/dsa-3568
- http://www.openwall.com/lists/oss-security/2016/04/11/3
- http://www.ubuntu.com/usn/USN-2957-1
- http://www.ubuntu.com/usn/USN-2957-2
- https://lists.gnu.org/archive/html/help-libtasn1/2016-04/msg00009.html
- https://security.gentoo.org/glsa/201703-05
- http://git.savannah.gnu.org/gitweb/?p=libtasn1.git%3Ba=commit%3Bh=a6e0a0b58f5cdaf4e9beca5bce69c09808cbb625
- http://git.savannah.gnu.org/gitweb/?p=libtasn1.git%3Ba=commit%3Bh=f435825c0f527a8e52e6ffbc3ad0bc60531d537e
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182299.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182907.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183221.html
- http://lists.opensuse.org/opensuse-updates/2016-06/msg00047.html
- http://lists.opensuse.org/opensuse-updates/2016-06/msg00097.html
- http://www.debian.org/security/2016/dsa-3568
- http://www.openwall.com/lists/oss-security/2016/04/11/3
- http://www.ubuntu.com/usn/USN-2957-1
- http://www.ubuntu.com/usn/USN-2957-2
- https://lists.gnu.org/archive/html/help-libtasn1/2016-04/msg00009.html
- https://security.gentoo.org/glsa/201703-05
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.