GnuTLS off-by-one

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in GnuTLS and classified as problematic. Affected is an unknown function. The manipulation leads to off-by-one. This vulnerability is uniquely identified as CVE-2026-42015. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in GnuTLS (the affected version unknown) and classified as problematic. This issue affects an unknown part. The manipulation with an unknown input leads to a off-by-one vulnerability. Using CWE to declare the problem leads to CWE-193. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. Impacted is availability. The summary by CVE is:

A flaw was found in gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.

The advisory is shared at access.redhat.com. The identification of this vulnerability is CVE-2026-42015 since 04/23/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/20/2026).

The vulnerability scanner Nessus provides a plugin with the ID 316839 (Amazon Linux 2023 : gnutls, gnutls-c++, gnutls-dane (ALAS2023-2026-1757)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (316839) and CERT Bund (WID-SEC-2026-1312). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • IBM MQ
  • Microsoft Azure Linux
  • Open Source GnuTLS

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (redhat): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Off-by-one
CWE: CWE-193 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 316839
Nessus Name: Amazon Linux 2023 : gnutls, gnutls-c++, gnutls-dane (ALAS2023-2026-1757)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/23/2026 CVE reserved
05/27/2026 +34 days Advisory disclosed
05/27/2026 +0 days VulDB entry created
06/20/2026 +23 days VulDB entry last update

Sourcesinfo

Advisory: RHSA-2026:20611
Status: Not defined

CVE: CVE-2026-42015 (🔒)
GCVE (CVE): GCVE-0-2026-42015
GCVE (VulDB): GCVE-100-365837
CERT Bund: WID-SEC-2026-1312 - GnuTLS: Mehrere Schwachstellen

Entryinfo

Created: 05/27/2026 06:25
Updated: 06/20/2026 01:56
Changes: 05/27/2026 06:25 (60), 05/28/2026 09:32 (2), 06/04/2026 03:07 (7), 06/20/2026 01:56 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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