CVE-2026-33845 @ Saiph

"CVE-2026-33845"
"gnutls-deb0-28-3.3.8-6+deb8u6"
"gnutls-openssl27-3.6.7-4+deb10u12)"
"gnutls-deb0-28"
"gnutls"
"Am I vulnerable?"

Status

accepted_risk

Priority

0.98

Match score

3.0

Risk

InfoLeak MemCorrupt DoS

CVSS

7.5 HIGH

Reason

cpe: gnutls; pkgs: gnutls-deb0-28, gnutls-openssl27; version: unknown (gnutls-deb0-28-3.3.8-6+deb8u6; gnutls-openssl27-3.6.7-4+deb10u12); risk:info_disclosure

Created

2026-08-03T18:24:09Z

Updated

2026-08-22T10:17:50Z

Closed

2026-08-04T20:00:02Z

Package interrogation (copy)

Run on the host — click to copy a command. Debian/apt

Package	Commands
gnutls-deb0-28-3.3.8-6+deb8u6
gnutls-openssl27-3.6.7-4+deb10u12)
gnutls-deb0-28
gnutls

Inventory lookup

Search package inventory across systems, then return here. Create a ticket on systems the matcher missed.

Suggestions: gnutls-deb0 · gnutls-openssl27 · gnutls · gnutls-deb0-28

Same product CVEs in your queue

Other tickets that look like the same product (from match reason). Relate them here to triage this CVE as the primary.

CVE	CVSS	Systems	Status	Matched	Already related
CVE-2026-1584	7.5	Library, Saiph, morris, mufasa	new	gnutls	—
CVE-2026-42009	7.5	Library, Matrix, Saiph, morris, mufasa	not_applicable	gnutls	→ CVE-2026-42010
CVE-2026-42010	7.1	Library, Matrix, Saiph, morris, mufasa	not_applicable	gnutls	—

Related CVE (same fix)

Point this ticket’s CVE at a higher-priority / same-fix primary so you only triage one.

Host OS / kernel

Debian GNU/Linux 10 (buster) (10) · debian

Arch

x86_64

kernel_release

uname -r → 4.19.0-27-amd64

kernel_version

uname -v → #1 SMP Debian 4.19.316-1 (2024-06-25)

For Linux kernel CVEs, kernel_version (Debian packaging / build string) often decides fixed vs not; kernel_release is used for upstream NVD range compares.

Same CVE on other hosts

Open the ticket for this CVE on another system.

System	Status	Priority	Updated
morris	does_not_affect	6.56	2026-08-22T10:17:50Z	Open
mufasa	does_not_affect	6.56	2026-08-22T10:17:50Z	Open
Library	accepted_risk	1.97	2026-08-22T10:17:50Z	Open

Description

A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.

Determination

GnuTLS has a flaw in how it reassembles DTLS (Datagram TLS) handshake fragments.
An attacker can send malformed DTLS handshake packets that contain fragments with:

Zero length
Non-zero offset

This triggers an integer underflow in the reassembly code, leading to an out-of-bounds read. The result can be:

Denial of service (process crash)
Possible information disclosure (reading adjacent memory)
no public access

Update status

Add note only

Mitigation log

2026-08-03T19:20:37Z

How an attacker would exploit it (high-level) Find a vulnerable service The target must be running a network service that uses GnuTLS and speaks DTLS (TLS over UDP). Common examples include certain VPN implementations, media/streaming servers, VoIP-related services, or custom applications that use DTLS.

2026-08-03T19:35:28Z — affects

GnuTLS has a flaw in how it reassembles DTLS (Datagram TLS) handshake fragments. An attacker can send malformed DTLS handshake packets that contain fragments with: Zero length Non-zero offset This triggers an integer underflow in the reassembly code, leading to an out-of-bounds read. The result can be: Denial of service (process crash) Possible information disclosure (reading adjacent memory)

2026-08-03T19:36:10Z

Low Risk - Internal Servers

2026-08-04T20:00:02Z — accepted_risk

no public access

References

NVD: CVE-2026-33845