CVE-2026-33845: Integer Underflow (Wrap or Wraparound)
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.
AI Analysis
Technical Summary
This vulnerability arises from improper handling of DTLS handshake fragments in GnuTLS, where malformed fragments with zero length and non-zero offset trigger an integer underflow during reassembly. The underflow leads to an out-of-bounds read, which can be exploited remotely to cause denial of service or leak information. The issue affects Red Hat Hardened Images and Red Hat Enterprise Linux 8 GnuTLS packages. Red Hat has issued security advisories and updated GnuTLS RPMs to fix this flaw.
Potential Impact
Successful exploitation of this vulnerability can cause denial of service by crashing the affected service or potentially disclose sensitive information due to out-of-bounds memory reads. The vulnerability is remotely exploitable without authentication, increasing its risk. The CVSS v3.1 base score is 7.5, indicating high severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed.
Mitigation Recommendations
Red Hat has released updated GnuTLS packages that fix this vulnerability. Users should apply the security updates referenced in Red Hat advisories RHSA-2026:13274 and RHSA-2026:20611 promptly. These updates include fixes for CVE-2026-33845 and related DTLS issues. Follow Red Hat's official guidance at https://access.redhat.com/security/cve/CVE-2026-33845 and https://access.redhat.com/articles/11258 for applying the patches. No additional mitigation is required once updates are applied.
CVE-2026-33845: Integer Underflow (Wrap or Wraparound)
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.
CVSS v3.1
Score 7.5high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper handling of DTLS handshake fragments in GnuTLS, where malformed fragments with zero length and non-zero offset trigger an integer underflow during reassembly. The underflow leads to an out-of-bounds read, which can be exploited remotely to cause denial of service or leak information. The issue affects Red Hat Hardened Images and Red Hat Enterprise Linux 8 GnuTLS packages. Red Hat has issued security advisories and updated GnuTLS RPMs to fix this flaw.
Potential Impact
Successful exploitation of this vulnerability can cause denial of service by crashing the affected service or potentially disclose sensitive information due to out-of-bounds memory reads. The vulnerability is remotely exploitable without authentication, increasing its risk. The CVSS v3.1 base score is 7.5, indicating high severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed.
Mitigation Recommendations
Red Hat has released updated GnuTLS packages that fix this vulnerability. Users should apply the security updates referenced in Red Hat advisories RHSA-2026:13274 and RHSA-2026:20611 promptly. These updates include fixes for CVE-2026-33845 and related DTLS issues. Follow Red Hat's official guidance at https://access.redhat.com/security/cve/CVE-2026-33845 and https://access.redhat.com/articles/11258 for applying the patches. No additional mitigation is required once updates are applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-03-24T05:31:54.914Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-33845","vendor":"Red Hat"}]
Threat ID: 69f3969dcbff5d8610590846
Added to database: 4/30/2026, 5:51:25 PM
Last enriched: 6/4/2026, 8:25:37 PM
Last updated: 6/15/2026, 10:23:13 AM
Views: 255
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