CVE-2026-33845

Summary

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.

Affected Software

VendorProductVersion RangeStatus
0 < 3.8.13affected
Red HatRed Hat Enterprise Linux 100:3.8.10-4.el10_2 < *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:3.8.9-9.el10_0.19 < *unaffected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support0:3.3.29-9.el7_9.1 < *unaffected
Red HatRed Hat Enterprise Linux 80:3.6.16-8.el8_10.6 < *unaffected
Red HatRed Hat Enterprise Linux 80:3.6.16-8.el8_10.6 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:3.6.14-10.el8_4.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:4.13-3.el8_4.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On0:3.6.14-10.el8_4.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On0:4.13-3.el8_4.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support0:3.6.16-5.el8_6.5 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support0:4.13-3.el8_6.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On0:3.6.16-5.el8_6.5 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On0:4.13-3.el8_6.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service0:3.6.16-7.el8_8.4 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service0:4.13-4.el8_8.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions0:3.6.16-7.el8_8.4 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions0:4.13-4.el8_8.1 < *unaffected
Red HatRed Hat Enterprise Linux 90:3.8.10-4.el9_8 < *unaffected
Red HatRed Hat Enterprise Linux 90:3.8.10-4.el9_8 < *unaffected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions0:3.8.3-4.el9_4.6 < *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support0:3.8.3-6.el9_6.4 < *unaffected
Red HatRed Hat Discovery 21782159791 < *unaffected
Red HatRed Hat Discovery 21782166952 < *unaffected
Red HatRed Hat Hardened Images3.8.13-1.hum1 < *unaffected
Red HatRed Hat Update Infrastructure 51781525684 < *unaffected
Red HatRed Hat Update Infrastructure 51781525671 < *unaffected
Red HatRed Hat Update Infrastructure 51781525693 < *unaffected
Red HatRed Hat Update Infrastructure 51781525739 < *unaffected

Weaknesses

  • CWE-191: Integer Underflow (Wrap or Wraparound)

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment

Additional References

References